Variability of SeaWiFs chlorophyll-a in the southwest Atlantic sector of the Southern Ocean: Strong topographic effects and weak seasonality SCIE SCOPUS

Cited 55 time in WEB OF SCIENCE Cited 62 time in Scopus
Title
Variability of SeaWiFs chlorophyll-a in the southwest Atlantic sector of the Southern Ocean: Strong topographic effects and weak seasonality
Author(s)
Park, Jisoo; Oh, Im-Sang; Kim, Hyun-Cheol; Yoo, Sinjae
Publication Year
2010-04
Abstract
This study examined 11-year (1997-2008) weekly and monthly time series of satellite-observed ocean color to understand the dominant temporal and spatial patterns of chlorophyll-a in the southwest Atlantic sector of the Southern Ocean. Using empirical orthogonal function analysis and k-means classification, we classified the study area into eight regions, which were in good accordance with the oceanographic and topographic features Examination of the chlorophyll-a time series in each region revealed that contrary to our expectation, regular seasonal phytoplankton blooms were observed only in a limited area. Of the eight regions, only two showed typical seasonal blooms, and one showed weak seasonality, whereas other regions exhibited irregular seasonal blooms of variable duration We attribute the absence of regularity in seasonal blooms to relatively shallow winter mixing, which would prevent entrainment of limiting micronutrients such as iron and silicate In the southwest Atlantic sector of the Southern Ocean, topographic effects and sea ice may be the most important factors controlling primary productivity In the South Georgia region, chlorophyll-a showed a significant correlation with geostrophic current velocity, indicating that topographic effects depend on the interaction of current strength and topographic structure. Interannual variability of the surface chlorophyll in some regions also revealed longer periodicity (similar to 6 years) The periodicity seemed to be related to El Nino-Southern Oscillation and to sea-ice dynamics influenced by the Antarctic Circumpolar Current (C) 2010 Elsevier Ltd All rights reserved.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4118
DOI
10.1016/j.dsr.2010.01.004
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.57, no.4, pp.604 - 620, 2010
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Interannual variation; Seasonality; SeaWiFS chlorophyll-a; Southern Ocean; Topographic effect
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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