Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula
Assessments of benthic coastal seawater carbonate chemistry in Antarctica are sparse. The studies have generally been short in duration, during the austral spring/summer, under sea ice, or offshore in ice-free water. Herein we present multi-frequency measurements for seawater collected from the shal...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/3230 2024-06-23T07:47:54+00:00 Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. 2015-07-28 application/pdf text/html application/epub+zip application/xml https://polarresearch.net/index.php/polar/article/view/3230 https://doi.org/10.3402/polar.v34.25582 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3230/pdf_30 https://polarresearch.net/index.php/polar/article/view/3230/html_26 https://polarresearch.net/index.php/polar/article/view/3230/_27 https://polarresearch.net/index.php/polar/article/view/3230/xml_25 https://polarresearch.net/index.php/polar/article/view/3230/8339 https://polarresearch.net/index.php/polar/article/view/3230 doi:10.3402/polar.v34.25582 Polar Research; Vol 34 (2015) 1751-8369 Antarctica aragonite calcite pH seawater chemistry total alkalinity info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftjpolarres https://doi.org/10.3402/polar.v34.25582 2024-06-13T23:33:00Z Assessments of benthic coastal seawater carbonate chemistry in Antarctica are sparse. The studies have generally been short in duration, during the austral spring/summer, under sea ice, or offshore in ice-free water. Herein we present multi-frequency measurements for seawater collected from the shallow coastal benthos on a weekly schedule over one year (May 2012–May 2013), daily schedule over three months (March–May 2013) and semidiurnal schedule over five weeks (March–April 2013). A notable pH increase (max pH = 8.62) occurred in the late austral spring/summer (November–December 2012), coinciding with sea-ice break-out and subsequent increase in primary productivity. We detected semidiurnal variation in seawater pH with a maximum variation of 0.13 pH units during the day and 0.11 pH units during the night. Daily variation in pH is likely related to biological activity, consistent with previous research. We calculated the variation in dissolved inorganic carbon (DIC) over each seawater measurement frequency, focusing on the primary DIC drivers in the Palmer Station region. From this, we estimated net biological activity and found it accounts for the greatest variations in DIC. Our seasonal data suggest that this coastal region tends to act as a carbon dioxide source during austral winter months and as a strong sink during the summer. These data characterize present-day seawater carbonate chemistry and the extent to which these measures vary over multiple time scales. This information will inform future experiments designed to evaluate the vulnerability of coastal benthic Antarctic marine organisms to ocean acidification.Keywords: Antarctica; aragonite; calcite; pH; seawater chemistry; total alkalinity(Published: 28 July 2015)Citation: Polar Research 2015, 34, 25582, http://dx.doi.org/10.3402/polar.v34.25582To access the supplementary material for this article, please see supplementary files in the column to the right (under Article Tools). Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Polar Research Sea ice Polar Research Antarctic Antarctic Peninsula Austral Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Polar Research 34 1 25582 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Antarctica aragonite calcite pH seawater chemistry total alkalinity |
spellingShingle |
Antarctica aragonite calcite pH seawater chemistry total alkalinity Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
topic_facet |
Antarctica aragonite calcite pH seawater chemistry total alkalinity |
description |
Assessments of benthic coastal seawater carbonate chemistry in Antarctica are sparse. The studies have generally been short in duration, during the austral spring/summer, under sea ice, or offshore in ice-free water. Herein we present multi-frequency measurements for seawater collected from the shallow coastal benthos on a weekly schedule over one year (May 2012–May 2013), daily schedule over three months (March–May 2013) and semidiurnal schedule over five weeks (March–April 2013). A notable pH increase (max pH = 8.62) occurred in the late austral spring/summer (November–December 2012), coinciding with sea-ice break-out and subsequent increase in primary productivity. We detected semidiurnal variation in seawater pH with a maximum variation of 0.13 pH units during the day and 0.11 pH units during the night. Daily variation in pH is likely related to biological activity, consistent with previous research. We calculated the variation in dissolved inorganic carbon (DIC) over each seawater measurement frequency, focusing on the primary DIC drivers in the Palmer Station region. From this, we estimated net biological activity and found it accounts for the greatest variations in DIC. Our seasonal data suggest that this coastal region tends to act as a carbon dioxide source during austral winter months and as a strong sink during the summer. These data characterize present-day seawater carbonate chemistry and the extent to which these measures vary over multiple time scales. This information will inform future experiments designed to evaluate the vulnerability of coastal benthic Antarctic marine organisms to ocean acidification.Keywords: Antarctica; aragonite; calcite; pH; seawater chemistry; total alkalinity(Published: 28 July 2015)Citation: Polar Research 2015, 34, 25582, http://dx.doi.org/10.3402/polar.v34.25582To access the supplementary material for this article, please see supplementary files in the column to the right (under Article Tools). |
format |
Article in Journal/Newspaper |
author |
Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. |
author_facet |
Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. |
author_sort |
Schram, Julie B. |
title |
Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
title_short |
Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
title_full |
Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
title_fullStr |
Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
title_full_unstemmed |
Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula |
title_sort |
multi-frequency observations of seawater carbonate chemistry on the central coast of the western antarctic peninsula |
publisher |
Norwegian Polar Institute |
publishDate |
2015 |
url |
https://polarresearch.net/index.php/polar/article/view/3230 https://doi.org/10.3402/polar.v34.25582 |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Antarctic Peninsula Austral Palmer Station Palmer-Station |
geographic_facet |
Antarctic Antarctic Peninsula Austral Palmer Station Palmer-Station |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Polar Research Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Polar Research Sea ice |
op_source |
Polar Research; Vol 34 (2015) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3230/pdf_30 https://polarresearch.net/index.php/polar/article/view/3230/html_26 https://polarresearch.net/index.php/polar/article/view/3230/_27 https://polarresearch.net/index.php/polar/article/view/3230/xml_25 https://polarresearch.net/index.php/polar/article/view/3230/8339 https://polarresearch.net/index.php/polar/article/view/3230 doi:10.3402/polar.v34.25582 |
op_doi |
https://doi.org/10.3402/polar.v34.25582 |
container_title |
Polar Research |
container_volume |
34 |
container_issue |
1 |
container_start_page |
25582 |
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1802638144888111104 |