Biological and physical controls on surface gas distributions along the Antarctic continental shelf
We present measurements of pCO2, O2, biological oxygen saturation (ΔO2/Ar) and N2 saturation in surface waters of the Antarctic continental shelf during austral summer, 2010–2011. pCO2 and ΔO2/Ar exhibited large spatial gradients and co-varied strongly with Chla. However, differential gas exchange l...
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ftawi:oai:epic.awi.de:37450 2023-05-15T13:40:27+02:00 Biological and physical controls on surface gas distributions along the Antarctic continental shelf Tortell, P. D. Bittig, H.C. Körtzinger, A. Jones, Elizabeth M. Hoppema, Mario 2015-02-23 https://epic.awi.de/id/eprint/37450/ https://hdl.handle.net/10013/epic.45091 unknown Tortell, P. D. , Bittig, H. , Körtzinger, A. , Jones, E. M. and Hoppema, M. orcid:0000-0002-2326-619X (2015) Biological and physical controls on surface gas distributions along the Antarctic continental shelf , 2015 Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives — North Meets South, Granada, Spain, 22 February 2015 - 27 February 2015 . hdl:10013/epic.45091 EPIC32015 Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives — North Meets South, Granada, Spain, 2015-02-22-2015-02-27 Conference notRev 2015 ftawi 2021-12-24T15:40:17Z We present measurements of pCO2, O2, biological oxygen saturation (ΔO2/Ar) and N2 saturation in surface waters of the Antarctic continental shelf during austral summer, 2010–2011. pCO2 and ΔO2/Ar exhibited large spatial gradients and co-varied strongly with Chla. However, differential gas exchange led to an uncoupling of biological O2 accumulation and dissolved inorganic carbon drawdown. Computed sea-air CO2 fluxes significantly exceeded regional climatological values, suggesting that CO2 sink along the Southern Ocean continental shelf may be currently underestimated. Whereas N2 was mostly supersaturated in surface waters, atmospheric processes and mixed layer entrainment resulted in super-saturation and under-saturation of mixed layer O2. Net community production derived from entrainment-corrected surface ΔO2/Ar data showed good coherence with independent estimates based on seasonal mixed layer DIC deficits, with the highest values (~200 mmol O2 m-2 d-1) observed in frontal mixing zones and stratified regions of sea-ice melt. Our results demonstrate the utility of various gas tracers in examining the impact of physical and biological forcing on surface water biogeochemistry in oceanographic complex waters of the Antarctic continental shelf. Conference Object Antarc* Antarctic Sea ice Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean The Antarctic Austral |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
We present measurements of pCO2, O2, biological oxygen saturation (ΔO2/Ar) and N2 saturation in surface waters of the Antarctic continental shelf during austral summer, 2010–2011. pCO2 and ΔO2/Ar exhibited large spatial gradients and co-varied strongly with Chla. However, differential gas exchange led to an uncoupling of biological O2 accumulation and dissolved inorganic carbon drawdown. Computed sea-air CO2 fluxes significantly exceeded regional climatological values, suggesting that CO2 sink along the Southern Ocean continental shelf may be currently underestimated. Whereas N2 was mostly supersaturated in surface waters, atmospheric processes and mixed layer entrainment resulted in super-saturation and under-saturation of mixed layer O2. Net community production derived from entrainment-corrected surface ΔO2/Ar data showed good coherence with independent estimates based on seasonal mixed layer DIC deficits, with the highest values (~200 mmol O2 m-2 d-1) observed in frontal mixing zones and stratified regions of sea-ice melt. Our results demonstrate the utility of various gas tracers in examining the impact of physical and biological forcing on surface water biogeochemistry in oceanographic complex waters of the Antarctic continental shelf. |
format |
Conference Object |
author |
Tortell, P. D. Bittig, H.C. Körtzinger, A. Jones, Elizabeth M. Hoppema, Mario |
spellingShingle |
Tortell, P. D. Bittig, H.C. Körtzinger, A. Jones, Elizabeth M. Hoppema, Mario Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
author_facet |
Tortell, P. D. Bittig, H.C. Körtzinger, A. Jones, Elizabeth M. Hoppema, Mario |
author_sort |
Tortell, P. D. |
title |
Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
title_short |
Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
title_full |
Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
title_fullStr |
Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
title_full_unstemmed |
Biological and physical controls on surface gas distributions along the Antarctic continental shelf |
title_sort |
biological and physical controls on surface gas distributions along the antarctic continental shelf |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37450/ https://hdl.handle.net/10013/epic.45091 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
EPIC32015 Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives — North Meets South, Granada, Spain, 2015-02-22-2015-02-27 |
op_relation |
Tortell, P. D. , Bittig, H. , Körtzinger, A. , Jones, E. M. and Hoppema, M. orcid:0000-0002-2326-619X (2015) Biological and physical controls on surface gas distributions along the Antarctic continental shelf , 2015 Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives — North Meets South, Granada, Spain, 22 February 2015 - 27 February 2015 . hdl:10013/epic.45091 |
_version_ |
1766134432379437056 |