ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 37 Issue 8 > 2011,37(8):999-1005. DOI:10.7519/j.issn.1000-0526.2011.8.012 Prev Next
Using FY2 Based Evapotranspiration Index to Monitor the Severe Drought in Southwest China
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Abstract:
Satellite based evapotranspiration according to the energy balance principle has clear physical meaning, and is widely used in the field of remote sensing for drought monitoring. Based on the China Energy and Water Balance Monitoring System (CEWBMS) and long timeseries (11 years) dataset of geostationary satellite, the percentage of relative evapotranspiration anomaly (PRETA) is obtained by using FY2/VISSR remote sensing data and investigated for largearea drought monitoring. Compared with polarorbiting satellite based drought indices, the FY2 based PRETA drought index has obvious advantages in the scope and frequency of monitoring. Due to the introduction of anomaly to relative evapotranspiration, the drought intensity classification is no longer dependent on seasonal and regional variations. Continuous quantitative evaluations of drought conditions in Southwest China from autumn 2009 to spring 2010 are carried out and statistics of the arid area are collected. Results show that spatial and temporal changes of drought status derived from PRETA are highly correlated with the actual drought situations. Trends of the areaaveraged PRETA and the precipitation anomaly percentage timeseries are highly consistent. Meanwhile, PRETA has a reasonable correlation with 10 cm relative soil moisture measurements. On the whole, the drought monitoring application in this study provided a practical way for realtime, largearea, high spatial resolution, quantitative and dynamic monitoring of drought.
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