Oceanographic variability and changes in Antarctic krill (Euphausia superba) abundance at South
Oceanographic data collected to the north of South Georgia were examined for three consecutive summers (1996/97, 1997/98, 1998/99). The results show the existence of a shelf break front during each period. The most reliable means of defining the front was the potential density anomaly at the near-su...
Main Authors: | , , , , , , , |
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Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2003
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Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.8818 http://www.st-andrews.ac.uk/~perg/Trathan_et_al_Fish_Oceanog_12_2003.pdf |
Summary: | Oceanographic data collected to the north of South Georgia were examined for three consecutive summers (1996/97, 1997/98, 1998/99). The results show the existence of a shelf break front during each period. The most reliable means of defining the front was the potential density anomaly at the near-surface potential temperature minimum. In each year, off-shelf waters were separated from on-shelf waters by water with a potential density anomaly between 27.22 and 27.29 kg m)3. During 1997/98, the near-surface potential temperature minimum was much colder and much shallower than in other years and was consistent with waters originating from much further south than South Georgia; these differences were further evident |
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