Wind-induced upwelling in the Kerguelen Plateau Region
Abstract. In contrast to most of the Southern Ocean, the Kerguelen Plateau supports an unusually strong spring chlorophyll (Chl a) bloom, likely because the euphotic zone in the region is supplied with higher iron concentrations. This study uses satellite wind, sea surface temperature (SST), and oce...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2014
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/06s15592 https://doi.org/10.5194/bgd-11-8373-2014 |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt06s15592 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt06s15592 2024-09-15T18:37:13+00:00 Wind-induced upwelling in the Kerguelen Plateau Region Gille, ST Carranza, MM Cambra, R Morrow, R 8373 - 8397 2014-06-05 https://escholarship.org/uc/item/06s15592 https://doi.org/10.5194/bgd-11-8373-2014 unknown eScholarship, University of California qt06s15592 https://escholarship.org/uc/item/06s15592 doi:10.5194/bgd-11-8373-2014 public Biogeosciences Discussions, vol 11, iss 6 Other Earth Sciences Biochemistry and Cell Biology Meteorology & Atmospheric Sciences article 2014 ftcdlib https://doi.org/10.5194/bgd-11-8373-2014 2024-06-28T06:28:22Z Abstract. In contrast to most of the Southern Ocean, the Kerguelen Plateau supports an unusually strong spring chlorophyll (Chl a) bloom, likely because the euphotic zone in the region is supplied with higher iron concentrations. This study uses satellite wind, sea surface temperature (SST), and ocean color data to explore the impact of wind-driven processes on upwelling of cold (presumably iron-rich) water to the euphotic zone. High wind speeds typically correlate with cold sea surface temperatures, implying that wind-mixing leads to enhanced vertical mixing. Negative wind-stress curl also correlates with cold SSTs, implying that Ekman pumping can further enhance upwelling, and coupling between winds and SSTs associated with mesoscale eddies can locally modulate the wind-stress curl. Kerguelen has a significant wind shadow on its downwind side, which generates a wind-stress curl dipole that shifts location depending on wind direction. This leads to locally enhanced Ekman pumping on the downstream side of the Kerguelen Plateau, where Chl a blooms are observed most years. Article in Journal/Newspaper Southern Ocean University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Other Earth Sciences Biochemistry and Cell Biology Meteorology & Atmospheric Sciences |
spellingShingle |
Other Earth Sciences Biochemistry and Cell Biology Meteorology & Atmospheric Sciences Gille, ST Carranza, MM Cambra, R Morrow, R Wind-induced upwelling in the Kerguelen Plateau Region |
topic_facet |
Other Earth Sciences Biochemistry and Cell Biology Meteorology & Atmospheric Sciences |
description |
Abstract. In contrast to most of the Southern Ocean, the Kerguelen Plateau supports an unusually strong spring chlorophyll (Chl a) bloom, likely because the euphotic zone in the region is supplied with higher iron concentrations. This study uses satellite wind, sea surface temperature (SST), and ocean color data to explore the impact of wind-driven processes on upwelling of cold (presumably iron-rich) water to the euphotic zone. High wind speeds typically correlate with cold sea surface temperatures, implying that wind-mixing leads to enhanced vertical mixing. Negative wind-stress curl also correlates with cold SSTs, implying that Ekman pumping can further enhance upwelling, and coupling between winds and SSTs associated with mesoscale eddies can locally modulate the wind-stress curl. Kerguelen has a significant wind shadow on its downwind side, which generates a wind-stress curl dipole that shifts location depending on wind direction. This leads to locally enhanced Ekman pumping on the downstream side of the Kerguelen Plateau, where Chl a blooms are observed most years. |
format |
Article in Journal/Newspaper |
author |
Gille, ST Carranza, MM Cambra, R Morrow, R |
author_facet |
Gille, ST Carranza, MM Cambra, R Morrow, R |
author_sort |
Gille, ST |
title |
Wind-induced upwelling in the Kerguelen Plateau Region |
title_short |
Wind-induced upwelling in the Kerguelen Plateau Region |
title_full |
Wind-induced upwelling in the Kerguelen Plateau Region |
title_fullStr |
Wind-induced upwelling in the Kerguelen Plateau Region |
title_full_unstemmed |
Wind-induced upwelling in the Kerguelen Plateau Region |
title_sort |
wind-induced upwelling in the kerguelen plateau region |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/06s15592 https://doi.org/10.5194/bgd-11-8373-2014 |
op_coverage |
8373 - 8397 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences Discussions, vol 11, iss 6 |
op_relation |
qt06s15592 https://escholarship.org/uc/item/06s15592 doi:10.5194/bgd-11-8373-2014 |
op_rights |
public |
op_doi |
https://doi.org/10.5194/bgd-11-8373-2014 |
_version_ |
1810481577564569600 |