Variations in and environmental controls of primary productivity in the Amundsen Sea
The Amundsen Sea is one of the regions with the highest primary productivity in the Antarctic. To better understand the role of the Southern Ocean in the global carbon cycle and in climate regulation, a better understanding of the variations in and environmental controls of primary productivity is n...
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ftcopernicus:oai:publications.copernicus.org:bgd98926 2023-05-15T13:23:39+02:00 Variations in and environmental controls of primary productivity in the Amundsen Sea Feng, Jianlong Li, Delei Zhang, Jing Zhao, Liang 2021-11-11 application/pdf https://doi.org/10.5194/bg-2021-296 https://bg.copernicus.org/preprints/bg-2021-296/ eng eng doi:10.5194/bg-2021-296 https://bg.copernicus.org/preprints/bg-2021-296/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-2021-296 2021-11-15T17:22:28Z The Amundsen Sea is one of the regions with the highest primary productivity in the Antarctic. To better understand the role of the Southern Ocean in the global carbon cycle and in climate regulation, a better understanding of the variations in and environmental controls of primary productivity is needed. Using cluster analysis, the Amundsen Sea was divided into nine bioregions. The biophysical differences among bioregions enhanced confidence to identify priorities and regions to study the temporal and spatial variations in primary productivity. Four nearshore bioregions with high net primary productivity or rapidly increasing rates were selected to analyze temporal and spatial variations in primary productivity in the Amundsen Sea. Due to changes in net solar radiation and sea ice, primary production had significant seasonal variation in these four bioregions. The phenology had changed at two bioregions (3 and 5), which has the third and fourth highest primary production, due to changes in the dissolved iron, nitrate, phosphate, and silicate concentrations. Annual primary production showed increasing trends in these four bioregions. The variation in primary production in the bioregion (9), which has the highest primary production, was mainly affected by variations in sea surface temperatures. In the bioregion, which has the second-highest primary production (8), the primary production was significantly positively correlated with sea surface temperature and significantly negatively correlated with sea ice thickness. The long-term changes of primary productivity in bioregions 3 and 5 were thought to be related to changes in the dissolved iron, nitrate, phosphate, and silicate concentrations, and dissolved iron was the limiting factor in these two bioregions. Bioregionalization not only disentangle multiple factors that control the spatial differences, but also disentangle limiting factors that affect the phenology, decadal and long-term changes in primary productivity. Text Amundsen Sea Antarc* Antarctic Sea ice Southern Ocean Copernicus Publications: E-Journals Amundsen Sea Antarctic Southern Ocean The Antarctic |
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Copernicus Publications: E-Journals |
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English |
description |
The Amundsen Sea is one of the regions with the highest primary productivity in the Antarctic. To better understand the role of the Southern Ocean in the global carbon cycle and in climate regulation, a better understanding of the variations in and environmental controls of primary productivity is needed. Using cluster analysis, the Amundsen Sea was divided into nine bioregions. The biophysical differences among bioregions enhanced confidence to identify priorities and regions to study the temporal and spatial variations in primary productivity. Four nearshore bioregions with high net primary productivity or rapidly increasing rates were selected to analyze temporal and spatial variations in primary productivity in the Amundsen Sea. Due to changes in net solar radiation and sea ice, primary production had significant seasonal variation in these four bioregions. The phenology had changed at two bioregions (3 and 5), which has the third and fourth highest primary production, due to changes in the dissolved iron, nitrate, phosphate, and silicate concentrations. Annual primary production showed increasing trends in these four bioregions. The variation in primary production in the bioregion (9), which has the highest primary production, was mainly affected by variations in sea surface temperatures. In the bioregion, which has the second-highest primary production (8), the primary production was significantly positively correlated with sea surface temperature and significantly negatively correlated with sea ice thickness. The long-term changes of primary productivity in bioregions 3 and 5 were thought to be related to changes in the dissolved iron, nitrate, phosphate, and silicate concentrations, and dissolved iron was the limiting factor in these two bioregions. Bioregionalization not only disentangle multiple factors that control the spatial differences, but also disentangle limiting factors that affect the phenology, decadal and long-term changes in primary productivity. |
format |
Text |
author |
Feng, Jianlong Li, Delei Zhang, Jing Zhao, Liang |
spellingShingle |
Feng, Jianlong Li, Delei Zhang, Jing Zhao, Liang Variations in and environmental controls of primary productivity in the Amundsen Sea |
author_facet |
Feng, Jianlong Li, Delei Zhang, Jing Zhao, Liang |
author_sort |
Feng, Jianlong |
title |
Variations in and environmental controls of primary productivity in the Amundsen Sea |
title_short |
Variations in and environmental controls of primary productivity in the Amundsen Sea |
title_full |
Variations in and environmental controls of primary productivity in the Amundsen Sea |
title_fullStr |
Variations in and environmental controls of primary productivity in the Amundsen Sea |
title_full_unstemmed |
Variations in and environmental controls of primary productivity in the Amundsen Sea |
title_sort |
variations in and environmental controls of primary productivity in the amundsen sea |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-2021-296 https://bg.copernicus.org/preprints/bg-2021-296/ |
geographic |
Amundsen Sea Antarctic Southern Ocean The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Southern Ocean The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Sea ice Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2021-296 https://bg.copernicus.org/preprints/bg-2021-296/ |
op_doi |
https://doi.org/10.5194/bg-2021-296 |
_version_ |
1766373815244292096 |