ENSO and variability of the Antarctic peninsula pelagic marine ecosystem

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Loeb, V. J., Hofmann, E. E., Klinck, J. M., Holm-Hansen, O., & White, W. B. (2009). ENSO and variability of the Antarctic peninsula pelagic marine ecosystem. Antarctic Science, 21(2), 135-148. doi:10.1017/S0954102008001636
TitleENSO and variability of the Antarctic peninsula pelagic marine ecosystem
AuthorsV. Loeb, E. Hofmann, J. Klinck, O. Holm-Hansen, W. White
AbstractThe West Antarctic Peninsula region is an important source of Antarctic krill (Euphausia superba) in the Southern Ocean. From 19802004 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 NioSouthern 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 multi-disciplinary data collected during 19902004, 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 19801996 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 PeninsulaWeddell Sea region. © Antarctic Science Ltd 2009.
JournalAntarctic Science
Start page135
End page148
Subjectsatmospheric circulation, data set, ecosystem management, El Nino-Southern Oscillation, hydrographic survey, latitude, marine ecosystem, oceanic current, pelagic ecosystem, sea ice, seasonal variation, Antarctic Peninsula, Antarctica, West Antarctica, Decapoda (Crustacea), Euphausia superba, Euphausiacea
NoteCited By (since 1996):20, Antarctica, Invertebrates, Oceanography, CODEN: ANTSE