Improvement of Soil Moisture Simulation over Chinese Main Land by LDAS-IAP/CAS-1.0

LAI Xin;WEN Jun;FAN Guangzhou;SONG Haiqing;ZHANG Yongli;ZHU Lihua;WANG Bingyun

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Plateau Meteorology
Plateau Meteorology ›› 2017, Vol. 36 ›› Issue (3) : 776-787. DOI: 10.7522/j.issn.1000-0534.2016.00126

Improvement of Soil Moisture Simulation over Chinese Main Land by LDAS-IAP/CAS-1.0

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Abstract

In order to validate the ability of The Land Data Assimilation System, and provide references for development and application of the system. The Land Data Assimilation System of Institute of Atmospheric Physics, Chinese Academy of Sciences(LDAS-IAP/CAS-1. 0) driven by the china meteorological forcing dataset(CMFD)was used to obtain soil moisture (SM) data from 2003 to 2010 over China. Without considering the assimilation of bright temperature of satellite remote sensing, the community land model version 3. 0 (CLM3. 0) driven by the same forcing data was used to simulate SM from 2003 to 2010 over China. The two simulated SM, observations, climate forecast system reanalysis (CFSR) of national centers for environmental prediction (NCEP) and global soil moisture data record based on active and passive micro wave sensors(SM-MW) were compared with each other. The results showed that the spatial distribution of simulated SM without considering the assimilation of bright temperature of satellite remote sensing and simulated SM considering the assimilation demonstrated obvious difference. Compared with observations, assimilated SM showed some improvement to simulated SM in Qinghai, Gansu, Ningxia and Shaanxi. The simulated and assimilated SM have more detail depiction in southern regions of 35°N compared to the other two products. After assimilation of bright temperature of satellite remote sensing, on the basis of the four seasons and annual SM from 2003 to 2010, the spatial distributions were characterized by a gradually increasing pattern from the northwest to southeast. From the spatial distributions, the most humid regions were located in the Northeast China Plain, the Jianghuai region, and the Qinghai-Tibetan Plateau, whereas dry regions were located in Xinjiang and Inner Mongolia. From the variation trend, the annual SM mainly increased in Inner Mongolia, the Tibetan Plateau and southern Xinjiang, and decreased mainly in other regions.

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Soil moisture / Simulate / Assimilate / Temporal spatial dis

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LAI Xin , WEN Jun , FAN Guangzhou , SONG Haiqing , ZHANG Yongli , ZHU Lihua , WANG Bingyun. Improvement of Soil Moisture Simulation over Chinese Main Land by LDAS-IAP/CAS-1.0. Plateau Meteorology. 2017, 36(3): 776-787 https://doi.org/10.7522/j.issn.1000-0534.2016.00126

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