Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait
<p>This study investigates the spatio-temporal variations in the chlorophyll-<span class="inline-formula"><i>a</i></span> (chl-<span class="inline-formula"><i>a</i></span>) blooms in the Bransfield Strait (BS) at a climatologi...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-03-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/20/389/2024/os-20-389-2024.pdf |
| _version_ | 1797253999950299136 |
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| author | M. Veny B. Aguiar-González Á. Marrero-Díaz T. Pereira-Vázquez Á. Rodríguez-Santana |
| author_facet | M. Veny B. Aguiar-González Á. Marrero-Díaz T. Pereira-Vázquez Á. Rodríguez-Santana |
| author_sort | M. Veny |
| collection | DOAJ |
| description | <p>This study investigates the spatio-temporal variations in the chlorophyll-<span class="inline-formula"><i>a</i></span> (chl-<span class="inline-formula"><i>a</i></span>) blooms in the Bransfield Strait (BS) at a climatological scale (1998–2018). We propose that suitable monitoring of these blooms can be achieved through remotely sensed observations only if the BS is divided following the Peninsula Front (PF), which ultimately influences the phytoplankton assemblage. Our analysis is based on characterizing climatological fields of sea surface temperature (SST), air temperature, sea ice coverage, chl-<span class="inline-formula"><i>a</i></span> concentrations and wind stress, guided by synoptic novel and historical in situ observations which reveal two niches for phytoplankton assemblage: the Transitional Bellingshausen Water (TBW) and Transitional Weddell Water (TWW) pools. The TBW pool features stratified, less saline, warmer waters with shallow mixed layers, while the TWW pool features well-mixed, saltier, and colder waters. We identify that the 0.6 °C isotherm corresponds to the summertime climatological PF location, effectively dividing the BS into two different scenarios. Furthermore, the 0.5 mg m<span class="inline-formula"><sup>−3</sup></span> chl-<span class="inline-formula"><i>a</i></span> isoline aligns well with the 0.6 °C isotherm, serving as a threshold for chl-<span class="inline-formula"><i>a</i></span> blooms of the highest concentrations around the South Shetland Islands. For the first time, these thresholds enable the monthly climatological descriptions of the two blooms developing in the BS on both sides of the PF. We think this approach underscores the potential of combining SST and chl-<span class="inline-formula"><i>a</i></span> data to monitor the year-to-year interplay of the chl-<span class="inline-formula"><i>a</i></span> blooms occurring in the TBW and TWW pools contoured by the PF.</p> |
| first_indexed | 2024-04-24T21:42:59Z |
| format | Article |
| id | doaj.art-c531a00c7be04d3488e40f38899ae666 |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-04-24T21:42:59Z |
| publishDate | 2024-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-c531a00c7be04d3488e40f38899ae6662024-03-21T05:28:07ZengCopernicus PublicationsOcean Science1812-07841812-07922024-03-012038941510.5194/os-20-389-2024Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield StraitM. VenyB. Aguiar-GonzálezÁ. Marrero-DíazT. Pereira-VázquezÁ. Rodríguez-Santana<p>This study investigates the spatio-temporal variations in the chlorophyll-<span class="inline-formula"><i>a</i></span> (chl-<span class="inline-formula"><i>a</i></span>) blooms in the Bransfield Strait (BS) at a climatological scale (1998–2018). We propose that suitable monitoring of these blooms can be achieved through remotely sensed observations only if the BS is divided following the Peninsula Front (PF), which ultimately influences the phytoplankton assemblage. Our analysis is based on characterizing climatological fields of sea surface temperature (SST), air temperature, sea ice coverage, chl-<span class="inline-formula"><i>a</i></span> concentrations and wind stress, guided by synoptic novel and historical in situ observations which reveal two niches for phytoplankton assemblage: the Transitional Bellingshausen Water (TBW) and Transitional Weddell Water (TWW) pools. The TBW pool features stratified, less saline, warmer waters with shallow mixed layers, while the TWW pool features well-mixed, saltier, and colder waters. We identify that the 0.6 °C isotherm corresponds to the summertime climatological PF location, effectively dividing the BS into two different scenarios. Furthermore, the 0.5 mg m<span class="inline-formula"><sup>−3</sup></span> chl-<span class="inline-formula"><i>a</i></span> isoline aligns well with the 0.6 °C isotherm, serving as a threshold for chl-<span class="inline-formula"><i>a</i></span> blooms of the highest concentrations around the South Shetland Islands. For the first time, these thresholds enable the monthly climatological descriptions of the two blooms developing in the BS on both sides of the PF. We think this approach underscores the potential of combining SST and chl-<span class="inline-formula"><i>a</i></span> data to monitor the year-to-year interplay of the chl-<span class="inline-formula"><i>a</i></span> blooms occurring in the TBW and TWW pools contoured by the PF.</p>https://os.copernicus.org/articles/20/389/2024/os-20-389-2024.pdf |
| spellingShingle | M. Veny B. Aguiar-González Á. Marrero-Díaz T. Pereira-Vázquez Á. Rodríguez-Santana Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait Ocean Science |
| title | Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait |
| title_full | Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait |
| title_fullStr | Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait |
| title_full_unstemmed | Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait |
| title_short | Biophysical coupling of seasonal chlorophyll-<i>a</i> bloom variations and phytoplankton assemblages across the Peninsula Front in the Bransfield Strait |
| title_sort | biophysical coupling of seasonal chlorophyll i a i bloom variations and phytoplankton assemblages across the peninsula front in the bransfield strait |
| url | https://os.copernicus.org/articles/20/389/2024/os-20-389-2024.pdf |
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