Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage
In remote regions such as the open Southern Ocean, satellite observations often provide the only available tool with which to evaluate large-scale biogeochemical processes. However, these observations need to be carefully evaluated with in situ measurements. With an average of 20 crossings per year...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-754 https://doi.org/10.1016/j.dsr2.2014.12.014 |
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ftncar:oai:drupal-site.org:articles_16684 2023-09-05T13:19:07+02:00 Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage Munro, David (author) Lovenduski, Nicole (author) Stephens, Britton (author) Newberger, Timothy (author) Arrigo, Kevin (author) Takahashi, Taro (author) Quay, Paul (author) Sprintall, Janet (author) Freeman, Natalie (author) Sweeney, Colm (author) 2015-04-01 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-754 https://doi.org/10.1016/j.dsr2.2014.12.014 en eng Elsevier Ltd. Deep-Sea Research Part II: Topical Studies in Oceanography http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-754 doi:10.1016/j.dsr2.2014.12.014 ark:/85065/d7tt4s54 Copyright 2015 Elsevier. Text article 2015 ftncar https://doi.org/10.1016/j.dsr2.2014.12.014 2023-08-14T18:44:58Z In remote regions such as the open Southern Ocean, satellite observations often provide the only available tool with which to evaluate large-scale biogeochemical processes. However, these observations need to be carefully evaluated with in situ measurements. With an average of 20 crossings per year from 2002 to 2011, the Drake Passage Time-series (DPT) represents one of the most complete datasets of biogeochemical measurements in the open Southern Ocean. This dataset offers a unique opportunity to validate satellite-based productivity algorithms and to improve understanding of the role of this region in the global carbon cycle. Net community production (NCP) was estimated using discrete measurements of total dissolved inorganic carbon (TCO₂) and phosphate (PO4³⁻), and high-frequency underway measurements of the partial pressure of carbon dioxide in the surface ocean (pCO₂surf) from the DPT, combined with estimates of gas exchange, Ekman transport, wind stress curl, and vertical entrainment. We estimate annual NCP using seasonal PO4³⁻ (NCPPO4³⁻) and TCO₂ (NCPTCO₂) budgets of 1.2±0.7 and 1.6±0.4 mol C m⁻² yr⁻¹, respectively. Budget terms for gas exchange, entrainment, and advective supply indicate that a closed system seasonal-drawdown approach that does not consider additional terms may underestimate NCP in this region by nearly 35%. NCP estimates are compared to satellite algorithms commonly used to estimate both net primary production (NPP) and organic carbon export. Budget-based NCP approaches indicate high rates of NCP during austral spring with little additional NCP over austral summer. In contrast, satellite approaches suggest a more gradual increase and decline in NCP rates over the growing season with approximately 40% of NCP accumulating during austral summer. Article in Journal/Newspaper Drake Passage Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Austral Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Drake Passage Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 114 49 63 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
In remote regions such as the open Southern Ocean, satellite observations often provide the only available tool with which to evaluate large-scale biogeochemical processes. However, these observations need to be carefully evaluated with in situ measurements. With an average of 20 crossings per year from 2002 to 2011, the Drake Passage Time-series (DPT) represents one of the most complete datasets of biogeochemical measurements in the open Southern Ocean. This dataset offers a unique opportunity to validate satellite-based productivity algorithms and to improve understanding of the role of this region in the global carbon cycle. Net community production (NCP) was estimated using discrete measurements of total dissolved inorganic carbon (TCO₂) and phosphate (PO4³⁻), and high-frequency underway measurements of the partial pressure of carbon dioxide in the surface ocean (pCO₂surf) from the DPT, combined with estimates of gas exchange, Ekman transport, wind stress curl, and vertical entrainment. We estimate annual NCP using seasonal PO4³⁻ (NCPPO4³⁻) and TCO₂ (NCPTCO₂) budgets of 1.2±0.7 and 1.6±0.4 mol C m⁻² yr⁻¹, respectively. Budget terms for gas exchange, entrainment, and advective supply indicate that a closed system seasonal-drawdown approach that does not consider additional terms may underestimate NCP in this region by nearly 35%. NCP estimates are compared to satellite algorithms commonly used to estimate both net primary production (NPP) and organic carbon export. Budget-based NCP approaches indicate high rates of NCP during austral spring with little additional NCP over austral summer. In contrast, satellite approaches suggest a more gradual increase and decline in NCP rates over the growing season with approximately 40% of NCP accumulating during austral summer. |
author2 |
Munro, David (author) Lovenduski, Nicole (author) Stephens, Britton (author) Newberger, Timothy (author) Arrigo, Kevin (author) Takahashi, Taro (author) Quay, Paul (author) Sprintall, Janet (author) Freeman, Natalie (author) Sweeney, Colm (author) |
format |
Article in Journal/Newspaper |
title |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
spellingShingle |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
title_short |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
title_full |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
title_fullStr |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
title_full_unstemmed |
Estimates of net community production in the Southern Ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pCO2 in Drake Passage |
title_sort |
estimates of net community production in the southern ocean determined from time series observations (2002–2011) of nutrients, dissolved inorganic carbon, and surface ocean pco2 in drake passage |
publisher |
Elsevier Ltd. |
publishDate |
2015 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-754 https://doi.org/10.1016/j.dsr2.2014.12.014 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Austral Curl Drake Passage Southern Ocean |
geographic_facet |
Austral Curl Drake Passage Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_relation |
Deep-Sea Research Part II: Topical Studies in Oceanography http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-754 doi:10.1016/j.dsr2.2014.12.014 ark:/85065/d7tt4s54 |
op_rights |
Copyright 2015 Elsevier. |
op_doi |
https://doi.org/10.1016/j.dsr2.2014.12.014 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
114 |
container_start_page |
49 |
op_container_end_page |
63 |
_version_ |
1776199937017511936 |