Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic
The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S,...
Ausführliche Beschreibung
Autor*in: |
Nathalie Lefèvre [verfasserIn] Carlos Mejia [verfasserIn] Dmitry Khvorostyanov [verfasserIn] Laurence Beaumont [verfasserIn] Urbain Koffi [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2021 |
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Übergeordnetes Werk: |
In: Oceans - MDPI AG, 2021, 2(2021), 1, Seite 126-148 |
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Übergeordnetes Werk: |
volume:2 ; year:2021 ; number:1 ; pages:126-148 |
Links: |
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DOI / URN: |
10.3390/oceans2010008 |
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Katalog-ID: |
DOAJ071731180 |
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520 | |a The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. | ||
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10.3390/oceans2010008 doi (DE-627)DOAJ071731180 (DE-599)DOAJ4ae66de1bd8c4529945aabf9fa5928ad DE-627 ger DE-627 rakwb eng GC1-1581 Nathalie Lefèvre verfasserin aut Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. carbon cycle tropical Atlantic dissolved inorganic carbon alkalinity Oceanography Carlos Mejia verfasserin aut Dmitry Khvorostyanov verfasserin aut Laurence Beaumont verfasserin aut Urbain Koffi verfasserin aut In Oceans MDPI AG, 2021 2(2021), 1, Seite 126-148 (DE-627)1691223018 26731924 nnns volume:2 year:2021 number:1 pages:126-148 https://doi.org/10.3390/oceans2010008 kostenfrei https://doaj.org/article/4ae66de1bd8c4529945aabf9fa5928ad kostenfrei https://www.mdpi.com/2673-1924/2/1/8 kostenfrei https://doaj.org/toc/2673-1924 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2 2021 1 126-148 |
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10.3390/oceans2010008 doi (DE-627)DOAJ071731180 (DE-599)DOAJ4ae66de1bd8c4529945aabf9fa5928ad DE-627 ger DE-627 rakwb eng GC1-1581 Nathalie Lefèvre verfasserin aut Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. carbon cycle tropical Atlantic dissolved inorganic carbon alkalinity Oceanography Carlos Mejia verfasserin aut Dmitry Khvorostyanov verfasserin aut Laurence Beaumont verfasserin aut Urbain Koffi verfasserin aut In Oceans MDPI AG, 2021 2(2021), 1, Seite 126-148 (DE-627)1691223018 26731924 nnns volume:2 year:2021 number:1 pages:126-148 https://doi.org/10.3390/oceans2010008 kostenfrei https://doaj.org/article/4ae66de1bd8c4529945aabf9fa5928ad kostenfrei https://www.mdpi.com/2673-1924/2/1/8 kostenfrei https://doaj.org/toc/2673-1924 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2 2021 1 126-148 |
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10.3390/oceans2010008 doi (DE-627)DOAJ071731180 (DE-599)DOAJ4ae66de1bd8c4529945aabf9fa5928ad DE-627 ger DE-627 rakwb eng GC1-1581 Nathalie Lefèvre verfasserin aut Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. carbon cycle tropical Atlantic dissolved inorganic carbon alkalinity Oceanography Carlos Mejia verfasserin aut Dmitry Khvorostyanov verfasserin aut Laurence Beaumont verfasserin aut Urbain Koffi verfasserin aut In Oceans MDPI AG, 2021 2(2021), 1, Seite 126-148 (DE-627)1691223018 26731924 nnns volume:2 year:2021 number:1 pages:126-148 https://doi.org/10.3390/oceans2010008 kostenfrei https://doaj.org/article/4ae66de1bd8c4529945aabf9fa5928ad kostenfrei https://www.mdpi.com/2673-1924/2/1/8 kostenfrei https://doaj.org/toc/2673-1924 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2 2021 1 126-148 |
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10.3390/oceans2010008 doi (DE-627)DOAJ071731180 (DE-599)DOAJ4ae66de1bd8c4529945aabf9fa5928ad DE-627 ger DE-627 rakwb eng GC1-1581 Nathalie Lefèvre verfasserin aut Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. carbon cycle tropical Atlantic dissolved inorganic carbon alkalinity Oceanography Carlos Mejia verfasserin aut Dmitry Khvorostyanov verfasserin aut Laurence Beaumont verfasserin aut Urbain Koffi verfasserin aut In Oceans MDPI AG, 2021 2(2021), 1, Seite 126-148 (DE-627)1691223018 26731924 nnns volume:2 year:2021 number:1 pages:126-148 https://doi.org/10.3390/oceans2010008 kostenfrei https://doaj.org/article/4ae66de1bd8c4529945aabf9fa5928ad kostenfrei https://www.mdpi.com/2673-1924/2/1/8 kostenfrei https://doaj.org/toc/2673-1924 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2 2021 1 126-148 |
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10.3390/oceans2010008 doi (DE-627)DOAJ071731180 (DE-599)DOAJ4ae66de1bd8c4529945aabf9fa5928ad DE-627 ger DE-627 rakwb eng GC1-1581 Nathalie Lefèvre verfasserin aut Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. carbon cycle tropical Atlantic dissolved inorganic carbon alkalinity Oceanography Carlos Mejia verfasserin aut Dmitry Khvorostyanov verfasserin aut Laurence Beaumont verfasserin aut Urbain Koffi verfasserin aut In Oceans MDPI AG, 2021 2(2021), 1, Seite 126-148 (DE-627)1691223018 26731924 nnns volume:2 year:2021 number:1 pages:126-148 https://doi.org/10.3390/oceans2010008 kostenfrei https://doaj.org/article/4ae66de1bd8c4529945aabf9fa5928ad kostenfrei https://www.mdpi.com/2673-1924/2/1/8 kostenfrei https://doaj.org/toc/2673-1924 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 2 2021 1 126-148 |
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Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic |
abstract |
The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. |
abstractGer |
The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. |
abstract_unstemmed |
The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO<sub<2</sub< emissions into the atmosphere. |
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Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic |
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The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO<sub<2</sub< (fCO<sub<2</sub<) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup<, are more important than the year-to-year variability that is less than 50 <inline-formula<μ<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"<<semantics<<mi mathvariant="sans-serif"<μ</mi<</semantics<</math<</inline-formula<mol kg<sup<−1</sup< over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. 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