Title :
Assimilating LANDSAT data in an ecosystem model for multi-year simulation of grassland carbon, water and energy budget
Author :
Nouvellon, Y. ; Moran, M.S. ; Chehbouni, A. ; Seen, D. Lo ; Bryant, R. ; Nichols, M. ; Prévot, L. ; Rambal, S. ; Ni, W. ; Bégue, A. ; Heilman, P. ; Keefer, T.O.
Author_Institution :
USDA-ARS-SWRC, Tucson, AZ, USA
Abstract :
In this study, a spatially explicit hydro-ecological model (SEHEM) has been developed and validated over a semi-arid grassland sub-watershed in Arizona. The model combines a plant growth sub-model to simulate the seasonal dynamics of root and aboveground biomass, and a hydrological sub-model to simulate soil moisture and temperature dynamics, energy and water budgets for the soil and the vegetation. In addition, the model has been coupled to radiative transfer models (RTMs) in the visible, near infrared and thermal infrared (TIR) bands so that canopy reflectance and directional radiative surface temperature are simulated. Landsat Thematic Mapper (TM) images obtained during a six year period were used to adjust some spatially variable model parameters by minimizing the difference between model simulations and remotely sensed data. Comparisons between observations and model estimates of above ground biomass, net radiation, sensible and latent heat flux, component temperatures are presented
Keywords :
atmospheric boundary layer; atmospheric chemistry; atmospheric humidity; atmospheric techniques; geochemistry; geophysical techniques; meteorology; remote sensing; C; LANDSAT; data assimilation; ecosystem model; energy budget; geophysical measurement technique; grass; grassland; hydrology; land surface; multi-year simulation; remote sensing data; soil moisture; vegetation; water budget; Biomass; Ecosystems; Electromagnetic coupling; Land surface temperature; Reflectivity; Remote sensing; Satellites; Soil moisture; Temperature sensors; Vegetation mapping;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2000. Proceedings. IGARSS 2000. IEEE 2000 International
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-6359-0
DOI :
10.1109/IGARSS.2000.858203