Title of article :
Retrieving soil temperature profile by assimilating MODIS LST products with ensemble Kalman filter
Author/Authors :
Huang، نويسنده , , Chunlin and Li، نويسنده , , Xin and Lu، نويسنده , , Ling، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
Proper estimation of initial state variables and model parameters are vital importance for determining the accuracy of numerical model prediction. In this work, we develop a one-dimensional land data assimilation scheme based on ensemble Kalman filter and Common Land Model version 3.0 (CoLM). This scheme is used to improve the estimation of soil temperature profile. The leaf area index (LAI) is also updated dynamically by MODIS LAI production and the MODIS land surface temperature (LST) products are assimilated into CoLM. The scheme was tested and validated by observations from four automatic weather stations (BTS, DRS, MGS, and DGS) in Mongolian Reference Site of CEOP during the period of October 1, 2002 to September 30, 2003. Results indicate that data assimilation improves the estimation of soil temperature profile about 1 K. In comparison with simulation, the assimilation results of soil heat fluxes also have much improvement about 13 W m− 2 at BTS and DGS and 2 W m− 2 at DRS and MGS, respectively. In addition, assimilation of MODIS land products into land surface model is a practical and effective way to improve the estimation of land surface variables and fluxes.
Keywords :
Common Land Model , Ensemble Kalman filter , Data assimilation , Soil temperature , MODIS LST
Journal title :
Remote Sensing of Environment
Journal title :
Remote Sensing of Environment