Regulation of Evapotranspiration in Different Precipitation Zones and Its Application in High-Temperature and Drought Monitoring

نویسندگان

چکیده

When drought occurs in different regions, evapotranspiration (ET) changes differently with the process of drought. To achieve an accurate monitoring large-scale using remote sensing, it is particularly necessary to clarify temporal and spatial characteristics ET soil water content (SWC). Firstly, based on measured data, combined artificial intelligence particle swarm optimization (PSO) algorithm, empirical model retrieval by FY–4A satellite data was established spatial–temporal SWC were further analyzed. Lastly, regulation regions distinguished sensing SWC. The main results are as follows: (1) correlation coefficient between estimated value 0.48 root mean square error 24 W·m−2. (2) In areas extreme shortage, limits conversion rate net radiation (Rn) (ECR) surpasses Rn become determinative factor ET. (3) arid areas, has a significant positive WVP other precipitation linear WVP, but slope fitting line for precipitation. relationship more complex. exceeding 800 mm, not significant. 200 mm or alpine have quadratic relationship. (4) ECR correlations SWC, reaches maximum when = 0.182 kPa 0.217 m3∙m−3. may be inhibited shortage supersaturation. (5) where determines ET, stress index (ESI) inversely proportional heat affects ESI directly Therefore, drought, various criteria should determined periods, considering information precipitation, underlying surface type, digital elevation.

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ژورنال

عنوان ژورنال: Remote Sensing

سال: 2022

ISSN: ['2315-4632', '2315-4675']

DOI: https://doi.org/10.3390/rs14246190