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Satellite-derived spatial and temporal biological variability in the Cyprus Eddy

Groom, S., Herut, B., Brenner, S., Zodiatis, G., Psarra, S., Kress, N., Krom, M.D., Law, C.S. and Drakopoulos, P. (2005) Satellite-derived spatial and temporal biological variability in the Cyprus Eddy. Deep Sea Research Part II : Tropical Studies in Oceanography, 52 (22-23). pp. 2990-3010. ISSN 0967-0645

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Abstract

The cycling of phosphorus in the Mediterranean (CYCLOPS) team investigated phosphate limitation in the Eastern Mediterranean and conducted a phosphate addition experiment in 2002 at the centre of an anticyclonic eddy south of Cyprus. The 2002 and other cruises generated a small database of chlorophyll-a (chl-a) profiles that enabled investigation of the performance of a variety of standard and regional bio-optical algorithms for remote sensing retrievals of chl-a in the region. The standard SeaWiFS OC4V4 and MODIS chlor_a2 algorithms overestimated chl-a as previously reported while a regional algorithm proposed by Bricaud et al. [2002. Algal biomass and sea surface temperature in the Mediterranean basin: intercomparison of data from various satellite sensors, and implications for primary production estimates. Remote Sensing Environment 81, 163–178] and the semi-analytical MODIS chlor_a3 gave improved retrievals. SeaWiFS mean chl-a maps are presented for the Eastern Mediterranean for each month between September 1997 and August 2004 and as multi-annual “climatological” images. The former showed that chl-a in the region decreased over the duration of the time series with reductions in the centre of the eddy, tracked using a quasi-Lagrangian approach, of approximately 33% between 1997 and 1998 and 2002 and 2003. This was not correlated with deep winter mixing represented as heat loss from the sea-surface or dust deposition represented as daily EP-TOMS aerosol index and annual aluminium deposition on the Israeli coast. It is hypothesised that the variations in chl-a are partly a function of the eddy dynamics. Daily SeaWiFS observations show that the 2002 phosphate release was conducted at a period of decreasing chl-a between the winter maximum and summer oligotrophic conditions; however, the rate of seasonal decrease was less than that observed in situ during the week following the phosphate release.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 Elsevier Ltd.
Keywords: remote sensing, ocean colour, SeaWiFS, phosphate addition, chlorophyll-a, Cyprus Eddy
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
The University of Leeds > Faculty of Environment (Leeds) > Earth and Biosphere Institute (Leeds)
Depositing User: Repository Officer
Date Deposited: 10 Nov 2006
Last Modified: 29 Sep 2010 14:15
Published Version: http://dx.doi.org/10.1016/j.dsr2.2005.08.019
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.dsr2.2005.08.019
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/1705

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