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شار گرمایی نهان
In this study, a simple framework for the dependence of evaporative fraction (the ratio of latent heat flux over net radiation) on soil moisture is used to analyze spatial and temporal variations of land- atmosphere coupling and its effect on near-surface air temperature.
Soil moisture does not affect near-surface air temper- ature directly but rather through its control over latent heat flux.
If, for example, soil moisture decreases, less water is available for evapotranspiration/latent heat flux, which results in a positive coupling of latent heat flux with soil moisture.
This decline in latent heat flux causes an enhancement of the fraction of net radiation that goes into sensible heat flux, which means that latent and sen- sible heat fluxes are negatively coupled.
Dirmeyer (2011) combined the sensitivity of latent heat flux to soil moisture changes with the standard deviation of soil moisture in order to create an index of surface flux sensitivity to soil moisture variability and applied it to model and reanalysis data.
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