Two decades of inorganic carbon dynamics along the West Antarctic Peninsula
We present 20 years of seawater inorganic carbon measurements collected along the western shelf and slope of the Antarctic Peninsula. Water column observations from summertime cruises and seasonal surface underway p CO 2 measurements provide unique insights into the spatial, seasonal, and interannua...
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ftdoajarticles:oai:doaj.org/article:47c22fcc22a546bc80c98119ab1389fd 2023-05-15T13:48:41+02:00 Two decades of inorganic carbon dynamics along the West Antarctic Peninsula C. Hauri S. C. Doney T. Takahashi M. Erickson G. Jiang H. W. Ducklow 2015-11-01T00:00:00Z https://doi.org/10.5194/bg-12-6761-2015 https://doaj.org/article/47c22fcc22a546bc80c98119ab1389fd EN eng Copernicus Publications http://www.biogeosciences.net/12/6761/2015/bg-12-6761-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-6761-2015 https://doaj.org/article/47c22fcc22a546bc80c98119ab1389fd Biogeosciences, Vol 12, Iss 22, Pp 6761-6779 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-6761-2015 2022-12-31T11:12:57Z We present 20 years of seawater inorganic carbon measurements collected along the western shelf and slope of the Antarctic Peninsula. Water column observations from summertime cruises and seasonal surface underway p CO 2 measurements provide unique insights into the spatial, seasonal, and interannual variability in this dynamic system. Discrete measurements from depths > 2000 m align well with World Ocean Circulation Experiment observations across the time series and underline the consistency of the data set. Surface total alkalinity and dissolved inorganic carbon data showed large spatial gradients, with a concomitant wide range of Ω arag (< 1 up to 3.9). This spatial variability was mainly driven by increasing influence of biological productivity towards the southern end of the sampling grid and meltwater input along the coast towards the northern end. Large inorganic carbon drawdown through biological production in summer caused high near-shore Ω arag despite glacial and sea-ice meltwater input. In support of previous studies, we observed Redfield behavior of regional C / N nutrient utilization, while the C / P (80.5 ± 2.5) and N / P (11.7 ± 0.3) molar ratios were significantly lower than the Redfield elemental stoichiometric values. Seasonal salinity-based predictions of Ω arag suggest that surface waters remained mostly supersaturated with regard to aragonite throughout the study. However, more than 20 % of the predictions for winters and springs between 1999 and 2013 resulted in Ω arag < 1.2. Such low levels of Ω arag may have implications for important organisms such as pteropods. Even though we did not detect any statistically significant long-term trends, the combination of on\-going ocean acidification and freshwater input may soon induce more unfavorable conditions than the ecosystem experiences today. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ocean acidification Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula The Antarctic Western Shelf ENVELOPE(164.448,164.448,-77.780,-77.780) Biogeosciences 12 22 6761 6779 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 C. Hauri S. C. Doney T. Takahashi M. Erickson G. Jiang H. W. Ducklow Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
We present 20 years of seawater inorganic carbon measurements collected along the western shelf and slope of the Antarctic Peninsula. Water column observations from summertime cruises and seasonal surface underway p CO 2 measurements provide unique insights into the spatial, seasonal, and interannual variability in this dynamic system. Discrete measurements from depths > 2000 m align well with World Ocean Circulation Experiment observations across the time series and underline the consistency of the data set. Surface total alkalinity and dissolved inorganic carbon data showed large spatial gradients, with a concomitant wide range of Ω arag (< 1 up to 3.9). This spatial variability was mainly driven by increasing influence of biological productivity towards the southern end of the sampling grid and meltwater input along the coast towards the northern end. Large inorganic carbon drawdown through biological production in summer caused high near-shore Ω arag despite glacial and sea-ice meltwater input. In support of previous studies, we observed Redfield behavior of regional C / N nutrient utilization, while the C / P (80.5 ± 2.5) and N / P (11.7 ± 0.3) molar ratios were significantly lower than the Redfield elemental stoichiometric values. Seasonal salinity-based predictions of Ω arag suggest that surface waters remained mostly supersaturated with regard to aragonite throughout the study. However, more than 20 % of the predictions for winters and springs between 1999 and 2013 resulted in Ω arag < 1.2. Such low levels of Ω arag may have implications for important organisms such as pteropods. Even though we did not detect any statistically significant long-term trends, the combination of on\-going ocean acidification and freshwater input may soon induce more unfavorable conditions than the ecosystem experiences today. |
format |
Article in Journal/Newspaper |
author |
C. Hauri S. C. Doney T. Takahashi M. Erickson G. Jiang H. W. Ducklow |
author_facet |
C. Hauri S. C. Doney T. Takahashi M. Erickson G. Jiang H. W. Ducklow |
author_sort |
C. Hauri |
title |
Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
title_short |
Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
title_full |
Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
title_fullStr |
Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
title_full_unstemmed |
Two decades of inorganic carbon dynamics along the West Antarctic Peninsula |
title_sort |
two decades of inorganic carbon dynamics along the west antarctic peninsula |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-6761-2015 https://doaj.org/article/47c22fcc22a546bc80c98119ab1389fd |
long_lat |
ENVELOPE(164.448,164.448,-77.780,-77.780) |
geographic |
Antarctic Antarctic Peninsula The Antarctic Western Shelf |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic Western Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Sea ice |
op_source |
Biogeosciences, Vol 12, Iss 22, Pp 6761-6779 (2015) |
op_relation |
http://www.biogeosciences.net/12/6761/2015/bg-12-6761-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-6761-2015 https://doaj.org/article/47c22fcc22a546bc80c98119ab1389fd |
op_doi |
https://doi.org/10.5194/bg-12-6761-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
22 |
container_start_page |
6761 |
op_container_end_page |
6779 |
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1766249579856003072 |