Abstract
Seasonal and interannual variability of remotely sensed by Sea-viewing Wide Field-of-View Sensor (SeaWiFS, aboard OrbView-2 satellite) and MODerate Resolution Imaging Spectroradiometer (MODIS-A, aboard Aqua satellite) surface chlorophyll a (CHL) in the Black Sea was analyzed since the start of SeaWiFS mission in 1997 till the spring of 2006. The spatio-temporal patterns analyzed by the empirical orthogonal functions (EOF) method revealed four main regions where CHL dynamics was correlated: northwest shelf (NW); southwest coastal region (SW); eastern region (E); and central region (C). Seasonal variability in the NW region had evident maximum in late spring resulting from the maximum of nutrient-rich Danube discharge. In three deep regions (SW, E, and C) the seasonal cycles were characterized by summer minimum and autumn-winter maximum. This pattern is typical to subtropical ocean areas where phytoplankton growth is nutrient-limited as a result of water column stratification. Danube discharge (correlated in 1990s–2000s with ENSO climatic cycle) looks like a most important factor regulating chlorophyll concentration on the northwestern shelf and, after a time lag of 2–2.5 years, in the deep Black Sea regions.
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Acknowledgments
The author would like to thank the SeaWiFS Project (Code 970.2) and the Distributed Active Archive Center (Code 902) at the NASA Goddard Space Flight Center for the production and distribution of remotely sensed images, respectively. These activities are sponsored by NASA's Mission to Planet Earth Program. I also thank the NASA Physical Oceanography Distributed Active Archive Center at the Jet Propulsion Laboratory, California Institute of Technology for SST data. Crosswavelet software was provided by A. Grinsted. I thank A.G. Kostianoy and V.N. Mikhailov for supplying the data on the intensity of the Danube River discharge.
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Nezlin, N.P. (2006). Seasonal and Interannual Variability of Remotely Sensed Chlorophyll. In: Kostianoy, A.G., Kosarev, A.N. (eds) The Black Sea Environment. The Handbook of Environmental Chemistry, vol 5Q. Springer, Berlin, Heidelberg. https://doi.org/10.1007/698_5_063
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