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dc.contributor.authorHorion, S.
dc.contributor.authorBergamino, N.
dc.contributor.authorStenuite, S.
dc.contributor.authorDescy, J-P.
dc.contributor.authorPlisnier, P-D.
dc.contributor.authorLoiselle , S.A.
dc.contributor.authorCornet , Y.
dc.date2010
dc.date.accessioned2016-03-15T10:03:47Z
dc.date.available2016-03-15T10:03:47Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/793
dc.descriptionLake Tanganyika is one of the world's great freshwater ecosystems. In recent decades its hydrodynamic<br>characteristics have undergone important changes that have had consequences on the lake's primary<br>productivity. The establishment of a long-term Ocean Color dataset for Lake Tanganyika is a fundamental tool<br>for understanding and monitoring these changes. We developed an approach to create a regionally calibrated<br>dataset of chlorophyll-a concentrations (CHL) and attenuation coefficients at 490 nm (K490) for the period<br>from July 2002 to December 2006 using daily calibrated radiances retrieved from the MODIS-Aqua sensor.<br>Standard MODIS Aqua Ocean Color products were found to not provide a suitable calibration for high altitude<br>lakes such as the Lake Tanganyika. An optimization of the extraction process and the validation of the dataset<br>were performed with independent sets of in situ measurements. Our results show that for the geographical,<br>atmospheric and optical conditions of Lake Tanganyika: (i) a coastal aerosol model set with high relative<br>humidity (90%) provides a suitable atmospheric correction; (ii) a significant correlation between in situ data<br>and CHL estimates using the MODIS specific OC3 algorithm is possible; and (iii) K490 estimates provide a<br>good level of significance. The resulting validated time series of bio-optical properties provides a fundamental<br>information base for the study of phytoplankton and primary production dynamics and interannual<br>trends. A comparison between surface chlorophyll-a concentrations estimated from field monitoring and<br>from the MODIS based dataset shows that remote sensing allows improved detection of surface blooms in<br>Lake Tanganyika
dc.languageeng
dc.publisherElsevier
dc.titleOptimized extraction of daily bio-optical time series derived from MODIS/Aqua imagery for Lake Tanganyika, Africa
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeSurface environments and collection management
dc.source.titleRemote Sensing of Environment
dc.source.volume114 (4)
dc.source.page781-791
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/j.rse.2009.11.012
dc.identifier.rmca619


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