Land cover land use change effects on surface water quality: Integrated MODIS and SeaWiFS assessment of the Dnieper and Don River basins and their reservoirs
Anatoly
A
Gitelson, University of Nebraska-Lincoln, agitelson2@unl.edu
(Presenting)
Geoffrey
M
Henebry, South Dakota State University, geoffrey.henebry@sdstate.edu
Our questions are: (1) Can we use MODIS data to generate new products that enable monitoring of key surface water quality variables? (2) Can we see the significant changes in land cover and land use following the collapse of the Soviet Union using satellite data?
First, we (a) validated the three-band model as well as its special case, the two-band model, using datasets collected over a considerable range of optical properties, trophic status, and geographical locations in turbid, productive lakes and reservoirs; (b) evaluated the extent to which the two-band model could be applied to the MODIS and three-band model could be applied to the MERIS to estimate chla in turbid, productive waters, and (c) estimated uncertainties of chla retrieval from MODIS and MERIS data taken over Ukrainian and Russian test sites.
Second, we analyzed land surface phenology within specific land cover categories using the nonparametric seasonal Mann-Kendall trend test adjusted for autocorrelation to NDVI image series from AVHRR (PAL and GIMMS) for the Soviet (1982-1988) and post-Soviet (1995-2000) epochs and from MODIS (MOD43C NBAR) for the recovery (2001-2006) epoch. This analysis identified the spatial location and extent of temporal trends and assessed their direction and statistical significance. About 90% of croplands and forested land in Dnieper Basin showed no significant trends during the Soviet epoch. There was little [much] area in significant negative trends during the [post-]Soviet epoch. During the recovery epoch, forested lands in the Don Basin exhibited fewer significant positive trends than in the Dnieper Basin.
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