Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model
The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissio...
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| Autor*in: |
Hopcroft, Peter O [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Rechteinformationen: |
Nutzungsrecht: © 2015. The Authors. |
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| Übergeordnetes Werk: |
Enthalten in: Journal of geophysical research / D - Washington, DC : Union, 1984, 120(2015), 16, Seite 8186-8205 |
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| Übergeordnetes Werk: |
volume:120 ; year:2015 ; number:16 ; pages:8186-8205 |
| Links: |
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| DOI / URN: |
10.1002/2015JD023742 |
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| 520 | |a The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes | ||
| 540 | |a Nutzungsrecht: © 2015. The Authors. | ||
| 650 | 4 | |a mineral dust | |
| 650 | 4 | |a dust emissions | |
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| 700 | 1 | |a Valdes, Paul J |4 oth | |
| 700 | 1 | |a Woodward, Stephanie |4 oth | |
| 700 | 1 | |a Joshi, Manoj M |4 oth | |
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10.1002/2015JD023742 doi PQ20160617 (DE-627)OLC1957059001 (DE-599)GBVOLC1957059001 (PRQ)p2132-e032e52d04e155e5c4d17ffd7cd01a8b421dc897d86f115f5695366e217d41260 (KEY)0137985220150000120001608186lastglacialmaximumradiativeforcingfrommineraldusta DE-627 ger DE-627 rakwb eng 550 DNB Hopcroft, Peter O verfasserin aut Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes Nutzungsrecht: © 2015. The Authors. mineral dust dust emissions Vegetation Paleoclimate science Atmospheric aerosols Dust Climate change Valdes, Paul J oth Woodward, Stephanie oth Joshi, Manoj M oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 120(2015), 16, Seite 8186-8205 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:120 year:2015 number:16 pages:8186-8205 http://dx.doi.org/10.1002/2015JD023742 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023742/abstract http://search.proquest.com/docview/1713683282 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 120 2015 16 8186-8205 |
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10.1002/2015JD023742 doi PQ20160617 (DE-627)OLC1957059001 (DE-599)GBVOLC1957059001 (PRQ)p2132-e032e52d04e155e5c4d17ffd7cd01a8b421dc897d86f115f5695366e217d41260 (KEY)0137985220150000120001608186lastglacialmaximumradiativeforcingfrommineraldusta DE-627 ger DE-627 rakwb eng 550 DNB Hopcroft, Peter O verfasserin aut Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes Nutzungsrecht: © 2015. The Authors. mineral dust dust emissions Vegetation Paleoclimate science Atmospheric aerosols Dust Climate change Valdes, Paul J oth Woodward, Stephanie oth Joshi, Manoj M oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 120(2015), 16, Seite 8186-8205 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:120 year:2015 number:16 pages:8186-8205 http://dx.doi.org/10.1002/2015JD023742 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023742/abstract http://search.proquest.com/docview/1713683282 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 120 2015 16 8186-8205 |
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10.1002/2015JD023742 doi PQ20160617 (DE-627)OLC1957059001 (DE-599)GBVOLC1957059001 (PRQ)p2132-e032e52d04e155e5c4d17ffd7cd01a8b421dc897d86f115f5695366e217d41260 (KEY)0137985220150000120001608186lastglacialmaximumradiativeforcingfrommineraldusta DE-627 ger DE-627 rakwb eng 550 DNB Hopcroft, Peter O verfasserin aut Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes Nutzungsrecht: © 2015. The Authors. mineral dust dust emissions Vegetation Paleoclimate science Atmospheric aerosols Dust Climate change Valdes, Paul J oth Woodward, Stephanie oth Joshi, Manoj M oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 120(2015), 16, Seite 8186-8205 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:120 year:2015 number:16 pages:8186-8205 http://dx.doi.org/10.1002/2015JD023742 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023742/abstract http://search.proquest.com/docview/1713683282 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 120 2015 16 8186-8205 |
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10.1002/2015JD023742 doi PQ20160617 (DE-627)OLC1957059001 (DE-599)GBVOLC1957059001 (PRQ)p2132-e032e52d04e155e5c4d17ffd7cd01a8b421dc897d86f115f5695366e217d41260 (KEY)0137985220150000120001608186lastglacialmaximumradiativeforcingfrommineraldusta DE-627 ger DE-627 rakwb eng 550 DNB Hopcroft, Peter O verfasserin aut Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes Nutzungsrecht: © 2015. The Authors. mineral dust dust emissions Vegetation Paleoclimate science Atmospheric aerosols Dust Climate change Valdes, Paul J oth Woodward, Stephanie oth Joshi, Manoj M oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 120(2015), 16, Seite 8186-8205 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:120 year:2015 number:16 pages:8186-8205 http://dx.doi.org/10.1002/2015JD023742 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023742/abstract http://search.proquest.com/docview/1713683282 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 120 2015 16 8186-8205 |
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10.1002/2015JD023742 doi PQ20160617 (DE-627)OLC1957059001 (DE-599)GBVOLC1957059001 (PRQ)p2132-e032e52d04e155e5c4d17ffd7cd01a8b421dc897d86f115f5695366e217d41260 (KEY)0137985220150000120001608186lastglacialmaximumradiativeforcingfrommineraldusta DE-627 ger DE-627 rakwb eng 550 DNB Hopcroft, Peter O verfasserin aut Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes Nutzungsrecht: © 2015. The Authors. mineral dust dust emissions Vegetation Paleoclimate science Atmospheric aerosols Dust Climate change Valdes, Paul J oth Woodward, Stephanie oth Joshi, Manoj M oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 120(2015), 16, Seite 8186-8205 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:120 year:2015 number:16 pages:8186-8205 http://dx.doi.org/10.1002/2015JD023742 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023742/abstract http://search.proquest.com/docview/1713683282 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 120 2015 16 8186-8205 |
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last glacial maximum radiative forcing from mineral dust aerosols in an earth system model |
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Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model |
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The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes |
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The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes |
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The mineral dust cycle in preindustrial (PI) and Last Glacial Maximum (LGM) simulations with the Coupled Model Intercomparison Project Phase 5 model Hadley Centre Global Environment Model 2‐Atmosphere (HadGEM2‐A) is evaluated. The modeled global dust cycle is enhanced at the LGM, with larger emissions in the Southern Hemisphere, consistent with some previous studies. Two different dust uplift schemes within HadGEM2 both show a similar LGM/PI increase in total emissions (60% and 80%) and global loading (100% and 75%), but there is a factor of 3 difference in the top of the atmosphere net LGM‐PI direct radiative forcing (−1.2 W m −2 and −0.4 W m −2 , respectively). This forcing is dominated by the short‐wave effects in both schemes. Recent reconstructions of dust deposition fluxes suggest that the LGM increase is overestimated in the Southern Atlantic and underestimated over east Antarctica. The LGM dust deposition reconstructions do not strongly discern between these two dust schemes because deposition is dominated by larger (2–6 μm diameter) particles for which the two schemes show similar loading in both time periods. The model with larger radiative forcing shows a larger relative emissions increase of smaller particles. This is because of the size‐dependent friction velocity emission threshold and different size distribution of the soil source particles compared with the second scheme. Size dependence of the threshold velocity is consistent with the theory of saltation, implying that the model with larger radiative forcing is more realistic. However, the large difference in radiative forcing between the two schemes highlights the size distribution at emission as a major uncertainty in predicting the climatic effects of dust cycle changes. Coupled atmosphere‐vegetation‐aerosol model study of the last glacial maximum Two dust emissions schemes show similar agreement with paleodust data Dust radiative forcing varies between −0.4 and −1.2 Wm −2 in the two schemes |
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Last glacial maximum radiative forcing from mineral dust aerosols in an Earth system model |
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