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|Title:||Multi-sensor satellite time series of optical properties and chlorophyll-a concentration in the Adriatic Sea|
|Authors:||MELIN Frederic; VANTREPOTTE Vincent; CLERICI Marco; D'ALIMONTE Davide; ZIBORDI Giuseppe; BERTHON Jean-Francois; CANUTI Elisabetta|
|Citation:||PROGRESS IN OCEANOGRAPHY vol. 91 no. 3 p. 229-244|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Articles in periodicals and books|
|Abstract:||Advanced remote sensing techniques and regional algorithms are combined to produce and analyze a 12-year multi-sensor time series of bio-optical properties for the Adriatic Sea. First, a multi-sensor series of normalized water-leaving radiance LWN is created with an optically-based merging technique applied to SeaWiFS and MODIS data, then distributions of inherent optical properties (IOPs) are obtained with a semi-analytical bio-optical model. Additionally, Chla is computed by two regional empirical algorithms associated with two classes of optical properties representative of open ocean waters and Adriatic coastal regions (classes 1 and 2, respectively). The domain of applicability of each algorithm is dynamically determined on the basis of the LWN input spectrum by a novelty detection approach. The various satellite products are validated using a comprehensive bio-optical time series collected in the northern Adriatic. At the basin level, the frequency of occurrence of classes 1 and 2 are 61% and 10%, respectively, with class 2 waters particularly located in the northern part and characterized by higher levels of Chla and IOPs. The annual cycle of Chla over the 12-year period exhibits significant variations in amplitude and phase; moreover, the annual cycle shows a reduced amplitude during a period centered on 2004 for a time interval that varies with the region. In the northern Adriatic, the overall level of Chla appears lower between 2003 and 2008 compared to the beginning of the series.|
|JRC Directorate:||Sustainable Resources|
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