ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem
The West Antarctic Peninsula region is an important source of Antarctic krill (Euphausia superba) in the Southern Ocean. From 1980-2004 abundance and concentration of phytoplankton and zooplankton, krill reproductive and recruitment success and seasonal sea ice extent here were significantly correla...
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2009
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ftolddominionuni:oai:digitalcommons.odu.edu:ccpo_pubs-1242 2023-12-17T10:21:27+01:00 ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem Loeb, Valerie J. Hofmann, Eileen E. Klinck, John M. Holm-Hansen, Osmund White, Warren B. 2009-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/ccpo_pubs/238 https://doi.org/10.1017/s0954102008001636 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1242/viewcontent/Loeb_2009_ENSO_and_variability_of_the_Antarcti.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/ccpo_pubs/238 doi:10.1017/s0954102008001636 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1242/viewcontent/Loeb_2009_ENSO_and_variability_of_the_Antarcti.pdf Web of Science: "Free full-text from publisher -- gold open access." CCPO Publications Antarctic circumpolar current Antarctic sipole Atmospheric-oceanic coupled processes Climate regime shifts Euphausia superba Southern Ocean Atmospheric Sciences Climate Ecology and Evolutionary Biology Environmental Sciences Oceanography article 2009 ftolddominionuni https://doi.org/10.1017/s0954102008001636 2023-11-20T19:09:54Z The West Antarctic Peninsula region is an important source of Antarctic krill (Euphausia superba) in the Southern Ocean. From 1980-2004 abundance and concentration of phytoplankton and zooplankton, krill reproductive and recruitment success and seasonal sea ice extent here were significantly correlated with the atmospheric Southern Oscillation Index and exhibited three- to five-year frequencies characteristic of El Nino-Southern Oscillation (ENSO) variability. This linkage was associated with movements of the Southern Antarctic Circumpolar Current Front and Boundary, a changing influence of Antarctic Circumpolar Current and Weddell Sea waters, and eastward versus westward flow and mixing processes that are consistent with forcing by the Antarctic Dipole high-latitude climate mode. Identification of hydrographic processes underlying ecosystem variability presented here were derived primarily from multidisciplinary data collected during 1990-2004, a period with relatively stable year-to-year sea ice conditions. These results differ from the overwhelming importance of seasonal sea ice development previously established using 1980-1996 data, a period marked by a major decrease in sea ice from the Antarctic Peninsula region in the late 1980s. These newer results reveal the more subtle consequences of ENSO variability on biological responses. They highlight the necessity of internally consistent long-term multidisciplinary datasets for understanding ecosystem variability and ultimately for establishing well-founded ecosystem management. Furthermore, natural environmental variability associated with interannual- and decadal-scale changes in ENSO forcing must be considered when assessing impacts of climate warming in the Antarctic Peninsula-Weddell Sea region. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea Old Dominion University: ODU Digital Commons Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell Antarctic Science 21 2 135 148 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Antarctic circumpolar current Antarctic sipole Atmospheric-oceanic coupled processes Climate regime shifts Euphausia superba Southern Ocean Atmospheric Sciences Climate Ecology and Evolutionary Biology Environmental Sciences Oceanography |
spellingShingle |
Antarctic circumpolar current Antarctic sipole Atmospheric-oceanic coupled processes Climate regime shifts Euphausia superba Southern Ocean Atmospheric Sciences Climate Ecology and Evolutionary Biology Environmental Sciences Oceanography Loeb, Valerie J. Hofmann, Eileen E. Klinck, John M. Holm-Hansen, Osmund White, Warren B. ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
topic_facet |
Antarctic circumpolar current Antarctic sipole Atmospheric-oceanic coupled processes Climate regime shifts Euphausia superba Southern Ocean Atmospheric Sciences Climate Ecology and Evolutionary Biology Environmental Sciences Oceanography |
description |
The West Antarctic Peninsula region is an important source of Antarctic krill (Euphausia superba) in the Southern Ocean. From 1980-2004 abundance and concentration of phytoplankton and zooplankton, krill reproductive and recruitment success and seasonal sea ice extent here were significantly correlated with the atmospheric Southern Oscillation Index and exhibited three- to five-year frequencies characteristic of El Nino-Southern Oscillation (ENSO) variability. This linkage was associated with movements of the Southern Antarctic Circumpolar Current Front and Boundary, a changing influence of Antarctic Circumpolar Current and Weddell Sea waters, and eastward versus westward flow and mixing processes that are consistent with forcing by the Antarctic Dipole high-latitude climate mode. Identification of hydrographic processes underlying ecosystem variability presented here were derived primarily from multidisciplinary data collected during 1990-2004, a period with relatively stable year-to-year sea ice conditions. These results differ from the overwhelming importance of seasonal sea ice development previously established using 1980-1996 data, a period marked by a major decrease in sea ice from the Antarctic Peninsula region in the late 1980s. These newer results reveal the more subtle consequences of ENSO variability on biological responses. They highlight the necessity of internally consistent long-term multidisciplinary datasets for understanding ecosystem variability and ultimately for establishing well-founded ecosystem management. Furthermore, natural environmental variability associated with interannual- and decadal-scale changes in ENSO forcing must be considered when assessing impacts of climate warming in the Antarctic Peninsula-Weddell Sea region. |
format |
Article in Journal/Newspaper |
author |
Loeb, Valerie J. Hofmann, Eileen E. Klinck, John M. Holm-Hansen, Osmund White, Warren B. |
author_facet |
Loeb, Valerie J. Hofmann, Eileen E. Klinck, John M. Holm-Hansen, Osmund White, Warren B. |
author_sort |
Loeb, Valerie J. |
title |
ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
title_short |
ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
title_full |
ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
title_fullStr |
ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
title_full_unstemmed |
ENSO and Variability of the Antarctic Peninsula Pelagic Marine Ecosystem |
title_sort |
enso and variability of the antarctic peninsula pelagic marine ecosystem |
publisher |
ODU Digital Commons |
publishDate |
2009 |
url |
https://digitalcommons.odu.edu/ccpo_pubs/238 https://doi.org/10.1017/s0954102008001636 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1242/viewcontent/Loeb_2009_ENSO_and_variability_of_the_Antarcti.pdf |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea |
op_source |
CCPO Publications |
op_relation |
https://digitalcommons.odu.edu/ccpo_pubs/238 doi:10.1017/s0954102008001636 https://digitalcommons.odu.edu/context/ccpo_pubs/article/1242/viewcontent/Loeb_2009_ENSO_and_variability_of_the_Antarcti.pdf |
op_rights |
Web of Science: "Free full-text from publisher -- gold open access." |
op_doi |
https://doi.org/10.1017/s0954102008001636 |
container_title |
Antarctic Science |
container_volume |
21 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
148 |
_version_ |
1785534775002398720 |