Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean
South Georgia phytoplankton blooms are amongst the largest of the Southern Ocean and are associated with a rich ecosystem and strong atmospheric carbon drawdown. Both aspects depend on the intensity of blooms, but also on their regularity. Here we use data from 12 yr of SeaWiFS (Sea-viewing Wide Fie...
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ftawi:oai:epic.awi.de:31983 2023-05-15T18:25:09+02:00 Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean Borrione, I. Schlitzer, R. 2013 application/pdf https://epic.awi.de/id/eprint/31983/ https://epic.awi.de/id/eprint/31983/1/bg-10-217-2013.pdf https://doi.org/10.5194/bg-10-217-2013 https://hdl.handle.net/10013/epic.40672 https://hdl.handle.net/10013/epic.40672.d001 unknown https://epic.awi.de/id/eprint/31983/1/bg-10-217-2013.pdf https://hdl.handle.net/10013/epic.40672.d001 Borrione, I. and Schlitzer, R. (2013) Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean , Biogeosciences, 10 (1), pp. 217-231 . doi:10.5194/bg-10-217-2013 <https://doi.org/10.5194/bg-10-217-2013> , hdl:10013/epic.40672 EPIC3Biogeosciences, 10(1), pp. 217-231, ISSN: 1726-4189 Article isiRev 2013 ftawi https://doi.org/10.5194/bg-10-217-2013 2021-12-24T15:38:14Z South Georgia phytoplankton blooms are amongst the largest of the Southern Ocean and are associated with a rich ecosystem and strong atmospheric carbon drawdown. Both aspects depend on the intensity of blooms, but also on their regularity. Here we use data from 12 yr of SeaWiFS (Sea-viewing Wide Field-of-view Sensor) ocean colour imagery and calculate the frequency of bloom occurrence (FBO) to re-examine spatial and temporal bloom distributions. We find that upstream of the island and outside the borders of the Georgia Basin, blooms occurred in less than 4 out of the 12 yr (FBO < 4). In contrast, FBO was mostly greater than 8 downstream of the island, i.e., to the north and northwest, and in places equal to 12, indicating that blooms occurred every year. The typical bloom area, defined as the region where blooms occurred in at least 8 out of the 12 yr, covers the entire Georgia Basin and the northern shelf of the island. The time series of surface chlorophyll a (Chl a) concentrations averaged over the typical bloom area shows that phytoplankton blooms occurred in every year between September 1997 and September 2010, and that Chl a values followed a clear seasonal cycle, with concentration peaks around December followed in many years by a second peak during late austral summer or early autumn, suggesting a bi-modal bloom pattern. The bloom regularity we describe here is in contrast with results of Park et al. (2010) who used a significantly different study area including regions that almost never exhibit bloom conditions. Article in Journal/Newspaper Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Austral Georgia Basin ENVELOPE(-35.500,-35.500,-50.750,-50.750) Southern Ocean Biogeosciences 10 1 217 231 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
South Georgia phytoplankton blooms are amongst the largest of the Southern Ocean and are associated with a rich ecosystem and strong atmospheric carbon drawdown. Both aspects depend on the intensity of blooms, but also on their regularity. Here we use data from 12 yr of SeaWiFS (Sea-viewing Wide Field-of-view Sensor) ocean colour imagery and calculate the frequency of bloom occurrence (FBO) to re-examine spatial and temporal bloom distributions. We find that upstream of the island and outside the borders of the Georgia Basin, blooms occurred in less than 4 out of the 12 yr (FBO < 4). In contrast, FBO was mostly greater than 8 downstream of the island, i.e., to the north and northwest, and in places equal to 12, indicating that blooms occurred every year. The typical bloom area, defined as the region where blooms occurred in at least 8 out of the 12 yr, covers the entire Georgia Basin and the northern shelf of the island. The time series of surface chlorophyll a (Chl a) concentrations averaged over the typical bloom area shows that phytoplankton blooms occurred in every year between September 1997 and September 2010, and that Chl a values followed a clear seasonal cycle, with concentration peaks around December followed in many years by a second peak during late austral summer or early autumn, suggesting a bi-modal bloom pattern. The bloom regularity we describe here is in contrast with results of Park et al. (2010) who used a significantly different study area including regions that almost never exhibit bloom conditions. |
format |
Article in Journal/Newspaper |
author |
Borrione, I. Schlitzer, R. |
spellingShingle |
Borrione, I. Schlitzer, R. Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
author_facet |
Borrione, I. Schlitzer, R. |
author_sort |
Borrione, I. |
title |
Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
title_short |
Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
title_full |
Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
title_fullStr |
Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
title_full_unstemmed |
Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean |
title_sort |
distribution and recurrence of phytoplankton blooms around south georgia, southern ocean |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/31983/ https://epic.awi.de/id/eprint/31983/1/bg-10-217-2013.pdf https://doi.org/10.5194/bg-10-217-2013 https://hdl.handle.net/10013/epic.40672 https://hdl.handle.net/10013/epic.40672.d001 |
long_lat |
ENVELOPE(-35.500,-35.500,-50.750,-50.750) |
geographic |
Austral Georgia Basin Southern Ocean |
geographic_facet |
Austral Georgia Basin Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Biogeosciences, 10(1), pp. 217-231, ISSN: 1726-4189 |
op_relation |
https://epic.awi.de/id/eprint/31983/1/bg-10-217-2013.pdf https://hdl.handle.net/10013/epic.40672.d001 Borrione, I. and Schlitzer, R. (2013) Distribution and recurrence of phytoplankton blooms around South Georgia, Southern Ocean , Biogeosciences, 10 (1), pp. 217-231 . doi:10.5194/bg-10-217-2013 <https://doi.org/10.5194/bg-10-217-2013> , hdl:10013/epic.40672 |
op_doi |
https://doi.org/10.5194/bg-10-217-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
1 |
container_start_page |
217 |
op_container_end_page |
231 |
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1766206396476424192 |