Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2009, Issue 6, Vol. 2, pp. 400-410
Using land surface temperature and vegetation characteristic
estimations by high resolution satellite data for modeling vertical
water and heat transfer on river basin
Е.Л. Музылев
1, А.Б. Успенский
2, З.П. Старцева
1, Е.В. Волкова
2, А.В. Кухарский
21 Институт водных проблем РАН, 220108, Республика Беларусь, Минск, ул. Казинца, 86/3
2 ГУ Научно-исследовательский центр космической гидрометеорологии "Планета"
The technologies (methods and algorithms) of AVHRR/NOAA data thematic processing have been refined,
providing the retrieval of soil temperature Тsg and emissivity E, surface-air temperature (at a level of vegetation
cover) Ta, effective radiative temperature Ts.eff (weighted linear combination of Ta and Tsg), as well as the
derivation of leaf area index LAI. The archive of synchronous satellite measurements of AVHRR/3 NOAA-18,
remote sounding data, and in-situ hydrometeorological observations has been compiled for the central region of
Russia including the Seim River basin for 2003-2006 vegetation seasons. On the base of special technology and
Internet resources the archive has been enlarged comprising remote sounding products (Тsg, Е, NDVI, LAI)
derived from MODIS (EOS/Terra and Aqua) data for the same region and vegetation seasons. The error
statistics of Ts.eff, Ta and Тsg derivation has been investigated for various samples, using comparison with in-situ
measurements. Good coincidence of these estimates has been revealed.
The model of vertical heat and water transfer for the "soil-vegetation-atmosphere" system (SVAT) has been
updated and modified to account for heterogeneities of soil, vegetation cover and meteorological characteristics
as well as to facilitate the pixel-to-pixel assimilation of above remote sounding products. In frame of these
studies: 1) the values of some model parameters have been specified and the model verification has been
performed; 2) the ability is confirmed to assimilate in the SVAT model satellite-derived estimates LAI and B
(AVHRR- and MODIS-based) instead of their ground-based estimates; 3) the opportunity has been shown of
using satellite-derived land surface temperature (AVHRR- and MODIS-based) as the SVAT model variable if
the time matching of satellite and ground-based observations takes place. The calculations of evapotranspiration,
latent and sensible heat fluxes, soil water and heat contents and other water and heat balance components have
been carried out with help of the SVAT model for different scenarios of LAI and B estimating (from AVHRR/3,
MODIS, and ground-based data) during seasons of vegetation 2003-2006. The acceptable accuracy levels of
water and heat balance components assessment have been achieved under all scenarios of LAI and B
specification.
Keywords: satellite data thematic processing, water and heat transfer modeling, soil and vegetation temperatures, soil moisture, leaf area index, vegetation cover fraction
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