Journal
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
Volume 48, Issue 11, Pages 2413-2422Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0967-0637(01)00024-3
Keywords
Madagascar Basin; phytoplankton bloom; mesoscale eddy field
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A hitherto-unnoticed phytoplankton bloom, of dimension 3000 x 1500 kin, occupies the Madagascar Basin in late austral summer, being a prominent feature in SeaWiFS images. A first-order interpretation of the bloom mechanism invokes the seasonal deepening of the mixed layer within a strong mesoscale eddy-field and the consequent entrainment of nutrients into the photic zone. Features of the bloom correspond closely and appropriately with features of the eddy-field as observed by TOPEX-POSEIDON sea level anomalies. The bloom failed to develop in 1998, the second year of a two-year ENSO episode, when anomalously weak Southeast Trades will have failed to deepen the mixed layer as in other years. (C) 2001 Elsevier Science Ltd. All rights reserved.
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