Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean
Continuous measurements of CO 2 partial pressure, dissolved oxygen, and the oxygen argon ratio (O 2 /Ar) in surface waters, complemented by discrete observations of inorganic carbon, along a late-summer south-to-north transect in the Australian Sector of the Southern Ocean (115E, WOCE I9S) are prese...
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ftunivtasecite:oai:ecite.utas.edu.au:88020 2023-05-15T13:37:23+02:00 Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean Shadwick, EH Tilbook, B Cassar, N Trull, TW Rintoul, SR 2015 https://doi.org/10.1016/j.jmarsys.2013.12.008 http://ecite.utas.edu.au/88020 en eng Elsevier Science Bv http://dx.doi.org/10.1016/j.jmarsys.2013.12.008 Shadwick, EH and Tilbook, B and Cassar, N and Trull, TW and Rintoul, SR, Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean, Journal of Marine Systems, 147 pp. 21-28. ISSN 0924-7963 (2015) [Refereed Article] http://ecite.utas.edu.au/88020 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1016/j.jmarsys.2013.12.008 2019-12-13T21:51:45Z Continuous measurements of CO 2 partial pressure, dissolved oxygen, and the oxygen argon ratio (O 2 /Ar) in surface waters, complemented by discrete observations of inorganic carbon, along a late-summer south-to-north transect in the Australian Sector of the Southern Ocean (115E, WOCE I9S) are presented. The largest net community production (NCP, based on O 2 /Ar), and airsea CO 2 disequilibrium (ΔDpCO 2 ) were found in three regions: (1) between the southern boundary of the Antarctic Circumpolar Current (63.6S) and southern extent of the Polar Front (58.6S, NCP = 30 mmol C m -2 d -1 , ΔpCO 2 = 30 to 50 μatm); (2) between the northern extent of the Sub-Antarctic Front (45.5S) and the Sub-Tropical Front (39.8S, NCP = 50 mmol C m -2 d -1 , ΔpCO 2 = 25 μatm); and (3) near 35S (NCP = 50 mmol C m -2 d -1 , ΔpCO 2 = 20 μatm). Areas of enhanced NCP were correlated with shallow mixed layer depths, suggesting that production is controlled in part by light limitation. We found good agreement between estimates of NCP based on O 2 /Ar measurements and those derived from seasonal (mixed layer) inorganic carbon deficits. In ice covered areas, and in areas where surface temperature changes act on shorter timescales than the equilibration of oxygen in the mixed layer, we find that physical controls on surface O 2 are of equal magnitude to biological controls, which has important implications for the use of oxygen sensors on autonomous platforms to infer NCP. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean ice covered areas eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Journal of Marine Systems 147 21 28 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Shadwick, EH Tilbook, B Cassar, N Trull, TW Rintoul, SR Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
Continuous measurements of CO 2 partial pressure, dissolved oxygen, and the oxygen argon ratio (O 2 /Ar) in surface waters, complemented by discrete observations of inorganic carbon, along a late-summer south-to-north transect in the Australian Sector of the Southern Ocean (115E, WOCE I9S) are presented. The largest net community production (NCP, based on O 2 /Ar), and airsea CO 2 disequilibrium (ΔDpCO 2 ) were found in three regions: (1) between the southern boundary of the Antarctic Circumpolar Current (63.6S) and southern extent of the Polar Front (58.6S, NCP = 30 mmol C m -2 d -1 , ΔpCO 2 = 30 to 50 μatm); (2) between the northern extent of the Sub-Antarctic Front (45.5S) and the Sub-Tropical Front (39.8S, NCP = 50 mmol C m -2 d -1 , ΔpCO 2 = 25 μatm); and (3) near 35S (NCP = 50 mmol C m -2 d -1 , ΔpCO 2 = 20 μatm). Areas of enhanced NCP were correlated with shallow mixed layer depths, suggesting that production is controlled in part by light limitation. We found good agreement between estimates of NCP based on O 2 /Ar measurements and those derived from seasonal (mixed layer) inorganic carbon deficits. In ice covered areas, and in areas where surface temperature changes act on shorter timescales than the equilibration of oxygen in the mixed layer, we find that physical controls on surface O 2 are of equal magnitude to biological controls, which has important implications for the use of oxygen sensors on autonomous platforms to infer NCP. |
format |
Article in Journal/Newspaper |
author |
Shadwick, EH Tilbook, B Cassar, N Trull, TW Rintoul, SR |
author_facet |
Shadwick, EH Tilbook, B Cassar, N Trull, TW Rintoul, SR |
author_sort |
Shadwick, EH |
title |
Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
title_short |
Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
title_full |
Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
title_fullStr |
Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
title_full_unstemmed |
Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean |
title_sort |
summertime physical and biological controls on o 2 and co 2 in the australian sector of the southern ocean |
publisher |
Elsevier Science Bv |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.jmarsys.2013.12.008 http://ecite.utas.edu.au/88020 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean ice covered areas |
genre_facet |
Antarc* Antarctic Southern Ocean ice covered areas |
op_relation |
http://dx.doi.org/10.1016/j.jmarsys.2013.12.008 Shadwick, EH and Tilbook, B and Cassar, N and Trull, TW and Rintoul, SR, Summertime physical and biological controls on O 2 and CO 2 in the Australian Sector of the Southern Ocean, Journal of Marine Systems, 147 pp. 21-28. ISSN 0924-7963 (2015) [Refereed Article] http://ecite.utas.edu.au/88020 |
op_doi |
https://doi.org/10.1016/j.jmarsys.2013.12.008 |
container_title |
Journal of Marine Systems |
container_volume |
147 |
container_start_page |
21 |
op_container_end_page |
28 |
_version_ |
1766091033569918976 |