Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay)
Biogeochemical variations of surface water in the Northeast Atlantic (Bay of Biscay) were examined using high-frequency underway measurements combined with monthly sampling of carbon-related variables. The mechanisms controlling seasonal CO2 variability were investigated by distinguishing the contri...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/500792/ https://nora.nerc.ac.uk/id/eprint/500792/1/jgrc20087_Jiang.pdf |
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ftnerc:oai:nora.nerc.ac.uk:500792 2023-05-15T17:31:35+02:00 Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) Jiang, Z-P. Hydes, David J. Tyrrell, Toby Hartman, Sue E. Hartman, Mark C. Dumousseaud, Cynthia Padin, Xose Antonio Skjelvan, Ingunn González-Pola, César 2013-02 text http://nora.nerc.ac.uk/id/eprint/500792/ https://nora.nerc.ac.uk/id/eprint/500792/1/jgrc20087_Jiang.pdf en eng https://nora.nerc.ac.uk/id/eprint/500792/1/jgrc20087_Jiang.pdf Jiang, Z-P.; Hydes, David J.; Tyrrell, Toby; Hartman, Sue E. orcid:0000-0002-6363-1331 Hartman, Mark C.; Dumousseaud, Cynthia; Padin, Xose Antonio; Skjelvan, Ingunn; González-Pola, César. 2013 Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay). Journal of Geophysical Research: Oceans, 118 (2). 785-800. https://doi.org/10.1002/jgrc.20087 <https://doi.org/10.1002/jgrc.20087> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/jgrc.20087 2023-02-04T19:36:31Z Biogeochemical variations of surface water in the Northeast Atlantic (Bay of Biscay) were examined using high-frequency underway measurements combined with monthly sampling of carbon-related variables. The mechanisms controlling seasonal CO2 variability were investigated by distinguishing the contributions of biological and physical processes to the monthly changes in dissolved inorganic carbon (DIC) and partial pressure of CO2 (pCO2). The seasonality of DIC (47–81 µmol kg−1) had a single peak with a winter maximum primarily driven by vertical mixing and a summer minimum driven by spring biological removal. Non-Redfield C:N uptake was observed in the nutrient-depleted summer but not during the spring bloom. In the North Atlantic, pCO2 seasonality shows a latitudinal transition: from the temperature-dominated oligotrophic subtropical gyre to the subpolar region where pCO2 is dominated by changing concentrations of DIC. In the midlatitude Bay of Biscay, the annual cycle of pCO2 (61–75 µatm) showed a double-peak distribution. The summer pCO2 peak was mainly driven by temperature increase, while the winter peak resulted from the dominant effect of entrainment of subsurface water. Interannual variations of DIC were more pronounced in winter and were driven by the changes in the strength of winter mixing. Higher wintertime concentrations and seasonal amplitudes of DIC were observed in cold years when the mixed-layer depths were deeper, which appears to be associated with negative phases of the North Atlantic Oscillation. The Bay of Biscay shows a decrease of CO2 uptake in 2008–2010 (−0.97 and −0.75 mol m−2 yr−1) compared to 2002–2004 (−1.47 and −1.68 mol m−2 yr−1). Article in Journal/Newspaper North Atlantic North Atlantic oscillation Northeast Atlantic Natural Environment Research Council: NERC Open Research Archive Journal of Geophysical Research: Oceans 118 2 785 800 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Biogeochemical variations of surface water in the Northeast Atlantic (Bay of Biscay) were examined using high-frequency underway measurements combined with monthly sampling of carbon-related variables. The mechanisms controlling seasonal CO2 variability were investigated by distinguishing the contributions of biological and physical processes to the monthly changes in dissolved inorganic carbon (DIC) and partial pressure of CO2 (pCO2). The seasonality of DIC (47–81 µmol kg−1) had a single peak with a winter maximum primarily driven by vertical mixing and a summer minimum driven by spring biological removal. Non-Redfield C:N uptake was observed in the nutrient-depleted summer but not during the spring bloom. In the North Atlantic, pCO2 seasonality shows a latitudinal transition: from the temperature-dominated oligotrophic subtropical gyre to the subpolar region where pCO2 is dominated by changing concentrations of DIC. In the midlatitude Bay of Biscay, the annual cycle of pCO2 (61–75 µatm) showed a double-peak distribution. The summer pCO2 peak was mainly driven by temperature increase, while the winter peak resulted from the dominant effect of entrainment of subsurface water. Interannual variations of DIC were more pronounced in winter and were driven by the changes in the strength of winter mixing. Higher wintertime concentrations and seasonal amplitudes of DIC were observed in cold years when the mixed-layer depths were deeper, which appears to be associated with negative phases of the North Atlantic Oscillation. The Bay of Biscay shows a decrease of CO2 uptake in 2008–2010 (−0.97 and −0.75 mol m−2 yr−1) compared to 2002–2004 (−1.47 and −1.68 mol m−2 yr−1). |
format |
Article in Journal/Newspaper |
author |
Jiang, Z-P. Hydes, David J. Tyrrell, Toby Hartman, Sue E. Hartman, Mark C. Dumousseaud, Cynthia Padin, Xose Antonio Skjelvan, Ingunn González-Pola, César |
spellingShingle |
Jiang, Z-P. Hydes, David J. Tyrrell, Toby Hartman, Sue E. Hartman, Mark C. Dumousseaud, Cynthia Padin, Xose Antonio Skjelvan, Ingunn González-Pola, César Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
author_facet |
Jiang, Z-P. Hydes, David J. Tyrrell, Toby Hartman, Sue E. Hartman, Mark C. Dumousseaud, Cynthia Padin, Xose Antonio Skjelvan, Ingunn González-Pola, César |
author_sort |
Jiang, Z-P. |
title |
Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
title_short |
Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
title_full |
Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
title_fullStr |
Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
title_full_unstemmed |
Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay) |
title_sort |
key controls on the seasonal and interannual variations of the carbonate system and air-sea co2 flux in the northeast atlantic (bay of biscay) |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/500792/ https://nora.nerc.ac.uk/id/eprint/500792/1/jgrc20087_Jiang.pdf |
genre |
North Atlantic North Atlantic oscillation Northeast Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation Northeast Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/500792/1/jgrc20087_Jiang.pdf Jiang, Z-P.; Hydes, David J.; Tyrrell, Toby; Hartman, Sue E. orcid:0000-0002-6363-1331 Hartman, Mark C.; Dumousseaud, Cynthia; Padin, Xose Antonio; Skjelvan, Ingunn; González-Pola, César. 2013 Key controls on the seasonal and interannual variations of the carbonate system and air-sea CO2 flux in the Northeast Atlantic (Bay of Biscay). Journal of Geophysical Research: Oceans, 118 (2). 785-800. https://doi.org/10.1002/jgrc.20087 <https://doi.org/10.1002/jgrc.20087> |
op_doi |
https://doi.org/10.1002/jgrc.20087 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
2 |
container_start_page |
785 |
op_container_end_page |
800 |
_version_ |
1766129247106105344 |