数字农科院2.0

Optimizing Latent Heat Flux Calculation via Composited Thermal Infrared Temperatures

文献类型： 外文期刊

作者： Jiang, Yazhen;Zhao, Jianing;Wu, Anqi;Si, Menglin;Bian, Zunjian;Tang, Ronglin;Li, Zhao-Liang

作者机构：

关键词： Land surface temperature;Land surface;Soil;Surface resistance;Biological system modeling;Vegetation mapping;Atmospheric modeling;Temperature sensors;Estimation;Remote sensing;Angular effect;latent heat flux (LE);land surface temperature (LST);single-source energy balance models

期刊名称： IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING

ISSN： 0196-2892

年卷期： 2025 年 63 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Latent heat flux (LE) is pivotal in the regional water-energy nexus, exemplifying complex interplays between atmosphere and land surface. Thermal infrared (TIR) land surface temperature (LST) offers direct and vital information for estimating LE through the single-source energy balance method. Nevertheless, variations in the viewing angles of remote sensing sensors can introduce angular effects in the retrieval of LST, potentially causing significant incompatibility issues in estimating LE. To alleviate this uncertainty, we adopt a viable approach by using two composited LSTs derived from the integration of soil and vegetation component temperatures from Sentinel-3 SLSTR, combined with fraction vegetation cover (FVC) obtained from both the GEOV2 FVC product and MODIS LAI-derived estimates. This composited LST was subsequently used as one of the inputs of a surface energy balance system (SEBS) model driven by measured meteorological and ERA5 reanalysis data in Heihe River Basin in China during 2016-2022, respectively. The results demonstrate that two types of composited LST reduced the root mean square error (RMSE) of estimated LE by 4.8 and 8.8 W/m(2), respectively, by using measured meteorological data, and using ERA5 meteorological data, the RMSE was reduced by 6.8 and 11.0 W/m(2), respectively. Regardless of the meteorological data and FVC used, the RMSE for all stations assessed in the study decreased. This indicates that by partially mitigating the angular effects of TIR LST, improvements in TIR-based surface LE estimation can be achieved over regional scales.

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