Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives
An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to fi...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Liang, Qing [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Rechteinformationen: |
Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Journal of geophysical research / D - Washington, DC : Union, 1984, 122(2017), 21 |
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| Übergeordnetes Werk: |
volume:122 ; year:2017 ; number:21 |
| Links: |
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| DOI / URN: |
10.1002/2017JD026926 |
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| Katalog-ID: |
OLC1999328256 |
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| 245 | 1 | 0 | |a Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
| 264 | 1 | |c 2017 | |
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| 520 | |a An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases | ||
| 540 | |a Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. | ||
| 650 | 4 | |a CCl | |
| 650 | 4 | |a hydroxyl | |
| 650 | 4 | |a lifetime | |
| 650 | 4 | |a Ratios | |
| 650 | 4 | |a Hydrofluorocarbons | |
| 650 | 4 | |a Cerebral hemispheres | |
| 650 | 4 | |a Abundance | |
| 650 | 4 | |a Air quality | |
| 650 | 4 | |a Hydrochlorofluorocarbons | |
| 650 | 4 | |a Trace gases | |
| 650 | 4 | |a Hydroxyl radicals | |
| 650 | 4 | |a Southern Hemisphere | |
| 650 | 4 | |a Chloroform | |
| 650 | 4 | |a Hemispheres | |
| 650 | 4 | |a Emission inventories | |
| 650 | 4 | |a Gases | |
| 650 | 4 | |a Atmospheric mixing | |
| 650 | 4 | |a Mixing ratios | |
| 650 | 4 | |a Emissions | |
| 650 | 4 | |a Emission measurements | |
| 650 | 4 | |a Northern Hemisphere | |
| 650 | 4 | |a Mixing ratio | |
| 650 | 4 | |a Emission | |
| 650 | 4 | |a Trends | |
| 650 | 4 | |a Scaling | |
| 650 | 4 | |a Ozone | |
| 700 | 1 | |a Chipperfield, Martyn P |4 oth | |
| 700 | 1 | |a Fleming, Eric L |4 oth | |
| 700 | 1 | |a Abraham, N. Luke |4 oth | |
| 700 | 1 | |a Braesicke, Peter |4 oth | |
| 700 | 1 | |a Burkholder, James B |4 oth | |
| 700 | 1 | |a Daniel, John S |4 oth | |
| 700 | 1 | |a Dhomse, Sandip |4 oth | |
| 700 | 1 | |a Fraser, Paul J |4 oth | |
| 700 | 1 | |a Hardiman, Steven C |4 oth | |
| 700 | 1 | |a Jackman, Charles H |4 oth | |
| 700 | 1 | |a Kinnison, Douglas E |4 oth | |
| 700 | 1 | |a Krummel, Paul B |4 oth | |
| 700 | 1 | |a Montzka, Stephen A |4 oth | |
| 700 | 1 | |a Morgenstern, Olaf |4 oth | |
| 700 | 1 | |a McCulloch, Archie |4 oth | |
| 700 | 1 | |a Mühle, Jens |4 oth | |
| 700 | 1 | |a Newman, Paul A |4 oth | |
| 700 | 1 | |a Orkin, Vladimir L |4 oth | |
| 700 | 1 | |a Pitari, Giovanni |4 oth | |
| 700 | 1 | |a Prinn, Ronald G |4 oth | |
| 700 | 1 | |a Rigby, Matthew |4 oth | |
| 700 | 1 | |a Rozanov, Eugene |4 oth | |
| 700 | 1 | |a Stenke, Andrea |4 oth | |
| 700 | 1 | |a Tummon, Fiona |4 oth | |
| 700 | 1 | |a Velders, Guus J. M |4 oth | |
| 700 | 1 | |a Visioni, Daniele |4 oth | |
| 700 | 1 | |a Weiss, Ray F |4 oth | |
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10.1002/2017JD026926 doi PQ20171228 (DE-627)OLC1999328256 (DE-599)GBVOLC1999328256 (PRQ)p1012-b77b90fcdfc1615e4ed6ad07cbc99964bdba79a9062e0f28bf40eccc58856b5c0 (KEY)0137985220170000122002100000derivingglobalohabundanceandatmosphericlifetimesfo DE-627 ger DE-627 rakwb eng 550 DNB Liang, Qing verfasserin aut Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone Chipperfield, Martyn P oth Fleming, Eric L oth Abraham, N. Luke oth Braesicke, Peter oth Burkholder, James B oth Daniel, John S oth Dhomse, Sandip oth Fraser, Paul J oth Hardiman, Steven C oth Jackman, Charles H oth Kinnison, Douglas E oth Krummel, Paul B oth Montzka, Stephen A oth Morgenstern, Olaf oth McCulloch, Archie oth Mühle, Jens oth Newman, Paul A oth Orkin, Vladimir L oth Pitari, Giovanni oth Prinn, Ronald G oth Rigby, Matthew oth Rozanov, Eugene oth Stenke, Andrea oth Tummon, Fiona oth Velders, Guus J. M oth Visioni, Daniele oth Weiss, Ray F oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 21 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:21 http://dx.doi.org/10.1002/2017JD026926 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 21 |
| spelling |
10.1002/2017JD026926 doi PQ20171228 (DE-627)OLC1999328256 (DE-599)GBVOLC1999328256 (PRQ)p1012-b77b90fcdfc1615e4ed6ad07cbc99964bdba79a9062e0f28bf40eccc58856b5c0 (KEY)0137985220170000122002100000derivingglobalohabundanceandatmosphericlifetimesfo DE-627 ger DE-627 rakwb eng 550 DNB Liang, Qing verfasserin aut Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone Chipperfield, Martyn P oth Fleming, Eric L oth Abraham, N. Luke oth Braesicke, Peter oth Burkholder, James B oth Daniel, John S oth Dhomse, Sandip oth Fraser, Paul J oth Hardiman, Steven C oth Jackman, Charles H oth Kinnison, Douglas E oth Krummel, Paul B oth Montzka, Stephen A oth Morgenstern, Olaf oth McCulloch, Archie oth Mühle, Jens oth Newman, Paul A oth Orkin, Vladimir L oth Pitari, Giovanni oth Prinn, Ronald G oth Rigby, Matthew oth Rozanov, Eugene oth Stenke, Andrea oth Tummon, Fiona oth Velders, Guus J. M oth Visioni, Daniele oth Weiss, Ray F oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 21 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:21 http://dx.doi.org/10.1002/2017JD026926 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 21 |
| allfields_unstemmed |
10.1002/2017JD026926 doi PQ20171228 (DE-627)OLC1999328256 (DE-599)GBVOLC1999328256 (PRQ)p1012-b77b90fcdfc1615e4ed6ad07cbc99964bdba79a9062e0f28bf40eccc58856b5c0 (KEY)0137985220170000122002100000derivingglobalohabundanceandatmosphericlifetimesfo DE-627 ger DE-627 rakwb eng 550 DNB Liang, Qing verfasserin aut Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone Chipperfield, Martyn P oth Fleming, Eric L oth Abraham, N. Luke oth Braesicke, Peter oth Burkholder, James B oth Daniel, John S oth Dhomse, Sandip oth Fraser, Paul J oth Hardiman, Steven C oth Jackman, Charles H oth Kinnison, Douglas E oth Krummel, Paul B oth Montzka, Stephen A oth Morgenstern, Olaf oth McCulloch, Archie oth Mühle, Jens oth Newman, Paul A oth Orkin, Vladimir L oth Pitari, Giovanni oth Prinn, Ronald G oth Rigby, Matthew oth Rozanov, Eugene oth Stenke, Andrea oth Tummon, Fiona oth Velders, Guus J. M oth Visioni, Daniele oth Weiss, Ray F oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 21 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:21 http://dx.doi.org/10.1002/2017JD026926 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 21 |
| allfieldsGer |
10.1002/2017JD026926 doi PQ20171228 (DE-627)OLC1999328256 (DE-599)GBVOLC1999328256 (PRQ)p1012-b77b90fcdfc1615e4ed6ad07cbc99964bdba79a9062e0f28bf40eccc58856b5c0 (KEY)0137985220170000122002100000derivingglobalohabundanceandatmosphericlifetimesfo DE-627 ger DE-627 rakwb eng 550 DNB Liang, Qing verfasserin aut Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone Chipperfield, Martyn P oth Fleming, Eric L oth Abraham, N. Luke oth Braesicke, Peter oth Burkholder, James B oth Daniel, John S oth Dhomse, Sandip oth Fraser, Paul J oth Hardiman, Steven C oth Jackman, Charles H oth Kinnison, Douglas E oth Krummel, Paul B oth Montzka, Stephen A oth Morgenstern, Olaf oth McCulloch, Archie oth Mühle, Jens oth Newman, Paul A oth Orkin, Vladimir L oth Pitari, Giovanni oth Prinn, Ronald G oth Rigby, Matthew oth Rozanov, Eugene oth Stenke, Andrea oth Tummon, Fiona oth Velders, Guus J. M oth Visioni, Daniele oth Weiss, Ray F oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 21 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:21 http://dx.doi.org/10.1002/2017JD026926 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 21 |
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10.1002/2017JD026926 doi PQ20171228 (DE-627)OLC1999328256 (DE-599)GBVOLC1999328256 (PRQ)p1012-b77b90fcdfc1615e4ed6ad07cbc99964bdba79a9062e0f28bf40eccc58856b5c0 (KEY)0137985220170000122002100000derivingglobalohabundanceandatmosphericlifetimesfo DE-627 ger DE-627 rakwb eng 550 DNB Liang, Qing verfasserin aut Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone Chipperfield, Martyn P oth Fleming, Eric L oth Abraham, N. Luke oth Braesicke, Peter oth Burkholder, James B oth Daniel, John S oth Dhomse, Sandip oth Fraser, Paul J oth Hardiman, Steven C oth Jackman, Charles H oth Kinnison, Douglas E oth Krummel, Paul B oth Montzka, Stephen A oth Morgenstern, Olaf oth McCulloch, Archie oth Mühle, Jens oth Newman, Paul A oth Orkin, Vladimir L oth Pitari, Giovanni oth Prinn, Ronald G oth Rigby, Matthew oth Rozanov, Eugene oth Stenke, Andrea oth Tummon, Fiona oth Velders, Guus J. M oth Visioni, Daniele oth Weiss, Ray F oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 21 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:21 http://dx.doi.org/10.1002/2017JD026926 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 21 |
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CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone |
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Liang, Qing @@aut@@ Chipperfield, Martyn P @@oth@@ Fleming, Eric L @@oth@@ Abraham, N. Luke @@oth@@ Braesicke, Peter @@oth@@ Burkholder, James B @@oth@@ Daniel, John S @@oth@@ Dhomse, Sandip @@oth@@ Fraser, Paul J @@oth@@ Hardiman, Steven C @@oth@@ Jackman, Charles H @@oth@@ Kinnison, Douglas E @@oth@@ Krummel, Paul B @@oth@@ Montzka, Stephen A @@oth@@ Morgenstern, Olaf @@oth@@ McCulloch, Archie @@oth@@ Mühle, Jens @@oth@@ Newman, Paul A @@oth@@ Orkin, Vladimir L @@oth@@ Pitari, Giovanni @@oth@@ Prinn, Ronald G @@oth@@ Rigby, Matthew @@oth@@ Rozanov, Eugene @@oth@@ Stenke, Andrea @@oth@@ Tummon, Fiona @@oth@@ Velders, Guus J. M @@oth@@ Visioni, Daniele @@oth@@ Weiss, Ray F @@oth@@ |
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Liang, Qing |
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Liang, Qing ddc 550 misc CCl misc hydroxyl misc lifetime misc Ratios misc Hydrofluorocarbons misc Cerebral hemispheres misc Abundance misc Air quality misc Hydrochlorofluorocarbons misc Trace gases misc Hydroxyl radicals misc Southern Hemisphere misc Chloroform misc Hemispheres misc Emission inventories misc Gases misc Atmospheric mixing misc Mixing ratios misc Emissions misc Emission measurements misc Northern Hemisphere misc Mixing ratio misc Emission misc Trends misc Scaling misc Ozone Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
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550 DNB Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives CCl hydroxyl lifetime Ratios Hydrofluorocarbons Cerebral hemispheres Abundance Air quality Hydrochlorofluorocarbons Trace gases Hydroxyl radicals Southern Hemisphere Chloroform Hemispheres Emission inventories Gases Atmospheric mixing Mixing ratios Emissions Emission measurements Northern Hemisphere Mixing ratio Emission Trends Scaling Ozone |
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Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
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Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
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Liang, Qing |
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deriving global oh abundance and atmospheric lifetimes for long‐lived gases: a search for ch3ccl3 alternatives |
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Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
| abstract |
An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases |
| abstractGer |
An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases |
| abstract_unstemmed |
An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone recovery. As the atmospheric mixing ratios of methyl chloroform (CH 3 CCl 3 ) (MCF), the commonly used OH reference gas, approaches zero, it is important to find alternative approaches to infer atmospheric OH abundance and variability. The lack of global bottom‐up emission inventories is the primary obstacle in choosing a MCF alternative. We illustrate that global emissions of long‐lived trace gases can be inferred from their observed mixing ratio differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH), given realistic estimates of their NH‐SH exchange time, the emission partitioning between the two hemispheres, and the NH versus SH OH abundance ratio. Using the observed long‐term trend and emissions derived from the measured hemispheric gradient, the combination of HFC‐32 (CH 2 F 2 ), HFC‐134a (CH 2 FCF 3 , HFC‐152a (CH 3 CHF 2 ), and HCFC‐22 (CHClF 2 ), instead of a single gas, will be useful as a MCF alternative to infer global and hemispheric OH abundance and trace gas lifetimes. The primary assumption on which this multispecies approach relies is that the OH lifetimes can be estimated by scaling the thermal reaction rates of a reference gas at 272 K on global and hemispheric scales. Thus, the derived hemispheric and global OH estimates are forced to reconcile the observed trends and gradient for all four compounds simultaneously. However, currently, observations of these gases from the surface networks do not provide more accurate OH abundance estimate than that from MCF. The interhemispheric mixing ratio difference of a long‐lived gas can be used as a quantitative proxy to derive global emissions The combination of multiple species in the gradient trend‐based approach should reduce the uncertainties in global OH abundance estimate HFC‐32 and HFC‐134a, with the help of HFC‐152a and HCFC‐22, are likely the best CH 3 CCl 3 alternatives as atmospheric OH reference gases |
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| title_short |
Deriving Global OH Abundance and Atmospheric Lifetimes for Long‐Lived Gases: A Search for CH3CCl3 Alternatives |
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http://dx.doi.org/10.1002/2017JD026926 http://onlinelibrary.wiley.com/doi/10.1002/2017JD026926/abstract https://search.proquest.com/docview/1972249404 |
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Chipperfield, Martyn P Fleming, Eric L Abraham, N. Luke Braesicke, Peter Burkholder, James B Daniel, John S Dhomse, Sandip Fraser, Paul J Hardiman, Steven C Jackman, Charles H Kinnison, Douglas E Krummel, Paul B Montzka, Stephen A Morgenstern, Olaf McCulloch, Archie Mühle, Jens Newman, Paul A Orkin, Vladimir L Pitari, Giovanni Prinn, Ronald G Rigby, Matthew Rozanov, Eugene Stenke, Andrea Tummon, Fiona Velders, Guus J. M Visioni, Daniele Weiss, Ray F |
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Chipperfield, Martyn P Fleming, Eric L Abraham, N. Luke Braesicke, Peter Burkholder, James B Daniel, John S Dhomse, Sandip Fraser, Paul J Hardiman, Steven C Jackman, Charles H Kinnison, Douglas E Krummel, Paul B Montzka, Stephen A Morgenstern, Olaf McCulloch, Archie Mühle, Jens Newman, Paul A Orkin, Vladimir L Pitari, Giovanni Prinn, Ronald G Rigby, Matthew Rozanov, Eugene Stenke, Andrea Tummon, Fiona Velders, Guus J. M Visioni, Daniele Weiss, Ray F |
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