Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications
We present full 2004–2005 seasonal cycles of CO2 partial pressure (pCO2) and dissolved oxygen (O2) in surface waters at a time series site in the central Labrador Sea (56.5°N, 52.6°W) and use these data to calculate annual net air-sea fluxes of CO2 and O2 as well as atmospheric potential oxygen (APO...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AGU (American Geophysical Union)
2008
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/5351/ https://oceanrep.geomar.de/id/eprint/5351/1/58_K%C3%B6rtzinger_2008_TheSeasonalCycleOfO2_Artzeit_pubid8944.pdf http://www.agu.org/journals/gb/ https://doi.org/10.1029/2007GB003029 |
id |
ftoceanrep:oai:oceanrep.geomar.de:5351 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:5351 2023-05-15T16:30:05+02:00 Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications Körtzinger, Arne Send, Uwe Wallace, Douglas W.R. Karstensen, Johannes DeGrandpre, Michael 2008 text https://oceanrep.geomar.de/id/eprint/5351/ https://oceanrep.geomar.de/id/eprint/5351/1/58_K%C3%B6rtzinger_2008_TheSeasonalCycleOfO2_Artzeit_pubid8944.pdf http://www.agu.org/journals/gb/ https://doi.org/10.1029/2007GB003029 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/5351/1/58_K%C3%B6rtzinger_2008_TheSeasonalCycleOfO2_Artzeit_pubid8944.pdf Körtzinger, A. , Send, U., Wallace, D. W. R., Karstensen, J. and DeGrandpre, M. (2008) Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications . Open Access Global Biogeochemical Cycles, 22 . GB1014. DOI 10.1029/2007GB003029 <https://doi.org/10.1029/2007GB003029>. doi:10.1029/2007GB003029 info:eu-repo/semantics/openAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1029/2007GB003029 2023-04-07T14:50:54Z We present full 2004–2005 seasonal cycles of CO2 partial pressure (pCO2) and dissolved oxygen (O2) in surface waters at a time series site in the central Labrador Sea (56.5°N, 52.6°W) and use these data to calculate annual net air-sea fluxes of CO2 and O2 as well as atmospheric potential oxygen (APO). The region is characterized by a net CO2 sink (2.7 ± 0.8 mol CO2 m−2 yr−1) that is mediated to a major extent by biological carbon drawdown during spring/summer. During wintertime, surface waters approach equilibrium with atmospheric CO2. Oxygen changes from marked undersaturation of about 6% during wintertime to strong supersaturation by up to 10% during the spring/summer bloom. Overall, the central Labrador Sea acts as an O2 sink of 10.0 ± 3.1 mol m−2 yr−1. The combined CO2 and O2 sink functions give rise to a sizable APO flux of 13.0 ± 4.0 mol m−2 yr−1 into surface waters of the central Labrador Sea. A mixed layer carbon budget yields a net community production of 4.0 ± 0.8 mol C m−2 during the 2005 productive season about one third of which appears to undergo subsurface respiration in a depth range that is reventilated during the following winter. The timing of the spring bloom is discussed and eddies from the West Greenland Current are thought to be associated with the triggering of the bloom. Finally, we use CO2 and O2 mixed layer dynamics during the 2005 spring bloom to evaluate a suite of prominent wind speed-dependent parameterizations for the gas transfer coefficient. We find very good agreement with those parameterizations which yield higher transfer coefficients at wind speeds above 10 m s−1. Article in Journal/Newspaper Greenland Labrador Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Global Biogeochemical Cycles 22 1 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We present full 2004–2005 seasonal cycles of CO2 partial pressure (pCO2) and dissolved oxygen (O2) in surface waters at a time series site in the central Labrador Sea (56.5°N, 52.6°W) and use these data to calculate annual net air-sea fluxes of CO2 and O2 as well as atmospheric potential oxygen (APO). The region is characterized by a net CO2 sink (2.7 ± 0.8 mol CO2 m−2 yr−1) that is mediated to a major extent by biological carbon drawdown during spring/summer. During wintertime, surface waters approach equilibrium with atmospheric CO2. Oxygen changes from marked undersaturation of about 6% during wintertime to strong supersaturation by up to 10% during the spring/summer bloom. Overall, the central Labrador Sea acts as an O2 sink of 10.0 ± 3.1 mol m−2 yr−1. The combined CO2 and O2 sink functions give rise to a sizable APO flux of 13.0 ± 4.0 mol m−2 yr−1 into surface waters of the central Labrador Sea. A mixed layer carbon budget yields a net community production of 4.0 ± 0.8 mol C m−2 during the 2005 productive season about one third of which appears to undergo subsurface respiration in a depth range that is reventilated during the following winter. The timing of the spring bloom is discussed and eddies from the West Greenland Current are thought to be associated with the triggering of the bloom. Finally, we use CO2 and O2 mixed layer dynamics during the 2005 spring bloom to evaluate a suite of prominent wind speed-dependent parameterizations for the gas transfer coefficient. We find very good agreement with those parameterizations which yield higher transfer coefficients at wind speeds above 10 m s−1. |
format |
Article in Journal/Newspaper |
author |
Körtzinger, Arne Send, Uwe Wallace, Douglas W.R. Karstensen, Johannes DeGrandpre, Michael |
spellingShingle |
Körtzinger, Arne Send, Uwe Wallace, Douglas W.R. Karstensen, Johannes DeGrandpre, Michael Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
author_facet |
Körtzinger, Arne Send, Uwe Wallace, Douglas W.R. Karstensen, Johannes DeGrandpre, Michael |
author_sort |
Körtzinger, Arne |
title |
Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
title_short |
Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
title_full |
Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
title_fullStr |
Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
title_full_unstemmed |
Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications |
title_sort |
seasonal cycle of o2 and pco2 in the central labrador sea: atmospheric, biological, and physical implications |
publisher |
AGU (American Geophysical Union) |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/5351/ https://oceanrep.geomar.de/id/eprint/5351/1/58_K%C3%B6rtzinger_2008_TheSeasonalCycleOfO2_Artzeit_pubid8944.pdf http://www.agu.org/journals/gb/ https://doi.org/10.1029/2007GB003029 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Labrador Sea |
genre_facet |
Greenland Labrador Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/5351/1/58_K%C3%B6rtzinger_2008_TheSeasonalCycleOfO2_Artzeit_pubid8944.pdf Körtzinger, A. , Send, U., Wallace, D. W. R., Karstensen, J. and DeGrandpre, M. (2008) Seasonal cycle of O2 and pCO2 in the central Labrador Sea: Atmospheric, biological, and physical implications . Open Access Global Biogeochemical Cycles, 22 . GB1014. DOI 10.1029/2007GB003029 <https://doi.org/10.1029/2007GB003029>. doi:10.1029/2007GB003029 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2007GB003029 |
container_title |
Global Biogeochemical Cycles |
container_volume |
22 |
container_issue |
1 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766019791815966720 |