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|Title:||Temporal Variability of 10-Year Global SeaWiFS Time-Series of Phytoplankton Chlorophyll a Concentration|
|Authors:||VANTREPOTTE Vincent; MELIN Frederic|
|Citation:||ICES JOURNAL OF MARINE SCIENCE vol. 66 no. 7 p. 1547-1556|
|Publisher:||OXFORD UNIV PRESS|
|Type:||Articles in periodicals and books|
|Abstract:||The SeaWiFS global data set now offers a 10-year time-series of a consistent, well calibrated, ocean colour record suitable for temporal analysis. The relative importance of the seasonal term in the Chla signal is first assessed using statistical techniques of temporal decomposition. The emphasis is on the Census Method II (X-11) approach that allows year-to-year variations of the seasonal component. The seasonality found in the SeaWiFS Chla record is analyzed through a generic province-based classification of marine ecosystems and at global scale, and is found very variable in space. Working with 5¿-resolution gridded Chla products, the contribution of the seasonal component derived from X-11 amounts to 64% of the total variance, as compared to only 36% if a fixed annual cycle is assumed. The capacity of X-11 of capturing the interannual variations in seasonality is used for diagnosing the stability of the Chla seasonal cycle. Finally, linear changes in Chla concentration observed after a decade of continuous ocean colour record are globally in line with previous observations on shorter series. Signigicant changes of both signs are detected in various regions of the world¿s oceans, foremost a general decrease of Chla in the mid-ocean gyres.|
|JRC Directorate:||Sustainable Resources|
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