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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 24, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(7):1547-1556; doi:10.1093/icesjms/fsp107
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: Effects of Climate Change on the World's Oceans [View the issue table of contents]

Temporal variability of 10-year global SeaWiFS time-series of phytoplankton chlorophyll a concentration

V. Vantrepotte and F. Mélin

Joint Research Centre, European Commission, Global Environment Monitoring Unit, Institute for Environment and Sustainability, Via Fermi, 2749, TP 272, 21027 Ispra, Italy

Correspondence to V. Vantrepotte: tel: +39 0332785627; fax: +39 0332789034; e-mail: vincent_vantrepotte{at}yahoo.fr

Vantrepotte, V., and Mélin, F. 2009. Temporal variability of 10-year global SeaWiFS time-series of phytoplankton chlorophyll a concentration. – ICES Journal of Marine Science, 66: 1547–1556.

The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) global dataset now offers a 10-year time-series of a consistent, well-calibrated, ocean colour record suitable to analyse temporal variability. The relative importance of the seasonal term in the chlorophyll a (Chl a) concentration signal is first assessed using statistical techniques of temporal decomposition. The emphasis is on the Census method II (X-11) approach, which allows year-to-year variations in the seasonal component. The seasonality detected in the SeaWiFS Chl a record is analysed through a generic province-based classification of marine ecosystems and at global scale and is found very variable spatially. Working with 5'-resolution gridded Chl a products, the contribution of the seasonal component derived from X-11 amounts to 64% of the total variance, compared with only 36% if a fixed annual cycle is assumed. The capacity of X-11 to capture interannual variations in seasonality is used to diagnose the stability of the Chl a seasonal cycle. Finally, linear changes in Chl a concentration observed after a decade of continuous ocean colour record agree globally with previous observations on shorter series. Significant changes of both signs are detected in various regions of the world’s oceans, but primarily a general decrease of Chl a in the mid-ocean gyres.

Keywords: chlorophyll a, global scale, seasonality, SeaWiFS, time-series, trend

Received 15 August 2008; accepted 1 March 2009; advance access publication 24 April 2009.


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