The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling
Amidst high-nutrient low-chlorophyll waters of the south-western Atlantic sector of the Southern Ocean, an intense phytoplankton bloom is observed annually north of South Georgia (37°W, 55°S). South Georgia blooms have a vital role in the ecosystem surrounding the island, and have been linked to one...
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ftawi:oai:epic.awi.de:33720 2024-09-15T18:36:33+00:00 The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling Borrione, Ines Schlitzer, Reiner Nielsdóttir, M. C. Aumont, Olivier 2013 https://epic.awi.de/id/eprint/33720/ https://hdl.handle.net/10013/epic.42089 unknown Borrione, I. , Schlitzer, R. orcid:0000-0002-3740-6499 , Nielsdóttir, M. C. and Aumont, O. (2013) The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling , IUEM seminars, Laboratoire des sciences de l'environment marin, Plouzané, France, 13 May 2013 - unspecified . hdl:10013/epic.42089 EPIC3IUEM seminars, Laboratoire des sciences de l'environment marin, Plouzané, France, 2013-05-13 Conference notRev 2013 ftawi 2024-06-24T04:07:26Z Amidst high-nutrient low-chlorophyll waters of the south-western Atlantic sector of the Southern Ocean, an intense phytoplankton bloom is observed annually north of South Georgia (37°W, 55°S). South Georgia blooms have a vital role in the ecosystem surrounding the island, and have been linked to one of the strongest seasonal atmospheric-carbon uptake in the open Southern Ocean. Which environmental conditions drive such remarkable productivity are still under debate, and were investigated in the current study using a multidisciplinary approach. Satellite-derived observations of surface chlorophyll a concentrations and circulation patterns were used to study the annual and inter-annual variability of phytoplankton blooms in the region. Our analysis reveals a time series of very regular blooms, controlled in space by circulation and regulated in time by surface silicate concentrations, temperature and light. The role of the fundamental, yet limiting, micronutrient iron was investigated with the coupled hydrodynamic-biogeochemical model ROMS_AGRIF-PISCES. Model results, validated against available observations, suggest a continuous supply of dissolved iron from the island's shallow shelves that is redistributed in the region by local circulation. Conversely, aeolian sources of iron have a negligible role in the main bloom area, but appear to be more important outside the influence of the South Georgia island mass effect. Conference Object South Georgia Island Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Amidst high-nutrient low-chlorophyll waters of the south-western Atlantic sector of the Southern Ocean, an intense phytoplankton bloom is observed annually north of South Georgia (37°W, 55°S). South Georgia blooms have a vital role in the ecosystem surrounding the island, and have been linked to one of the strongest seasonal atmospheric-carbon uptake in the open Southern Ocean. Which environmental conditions drive such remarkable productivity are still under debate, and were investigated in the current study using a multidisciplinary approach. Satellite-derived observations of surface chlorophyll a concentrations and circulation patterns were used to study the annual and inter-annual variability of phytoplankton blooms in the region. Our analysis reveals a time series of very regular blooms, controlled in space by circulation and regulated in time by surface silicate concentrations, temperature and light. The role of the fundamental, yet limiting, micronutrient iron was investigated with the coupled hydrodynamic-biogeochemical model ROMS_AGRIF-PISCES. Model results, validated against available observations, suggest a continuous supply of dissolved iron from the island's shallow shelves that is redistributed in the region by local circulation. Conversely, aeolian sources of iron have a negligible role in the main bloom area, but appear to be more important outside the influence of the South Georgia island mass effect. |
format |
Conference Object |
author |
Borrione, Ines Schlitzer, Reiner Nielsdóttir, M. C. Aumont, Olivier |
spellingShingle |
Borrione, Ines Schlitzer, Reiner Nielsdóttir, M. C. Aumont, Olivier The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
author_facet |
Borrione, Ines Schlitzer, Reiner Nielsdóttir, M. C. Aumont, Olivier |
author_sort |
Borrione, Ines |
title |
The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
title_short |
The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
title_full |
The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
title_fullStr |
The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
title_full_unstemmed |
The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
title_sort |
south georgia island mass effect: observations from satellite imagery and biogeochemical modeling |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/33720/ https://hdl.handle.net/10013/epic.42089 |
genre |
South Georgia Island Southern Ocean |
genre_facet |
South Georgia Island Southern Ocean |
op_source |
EPIC3IUEM seminars, Laboratoire des sciences de l'environment marin, Plouzané, France, 2013-05-13 |
op_relation |
Borrione, I. , Schlitzer, R. orcid:0000-0002-3740-6499 , Nielsdóttir, M. C. and Aumont, O. (2013) The South Georgia island mass effect: observations from satellite imagery and biogeochemical modeling , IUEM seminars, Laboratoire des sciences de l'environment marin, Plouzané, France, 13 May 2013 - unspecified . hdl:10013/epic.42089 |
_version_ |
1810480217406308352 |