报告内容简介
In this study, a simplified semi-physical retrieval algorithm for latent heat
(LH) released from precipitation over the Tibetan Plateau (TP) is derived and
analyzed. The physical basis of this algorithm is that the vertical gradient of
rain rate (-dR/dZ or Γ) represents the temporal rate of rain formation based on
the steady-state assumption, and the precipitation formation rate is closely
related to the cloud formation rate, which is directly proportional to the
latent heating rate. In this algorithm, the LH rate is represented as a linear
function of Γ with fixed slope and intercept term determined by 3-month Weather
Research and Forecasting Model simulations over the TP. Comparison to model
results shows that the retrieval scheme can correctly capture the main features
of LH horizontally and vertically. Comparison with results from other two widely
accepted LH algorithms usingGlobal Precipitation Measurement Dual Precipitation
Radar real observations shows that this retrieval scheme generally agrees with
them over low-altitude areas but yields more convective-type LH over the
highlands with a relatively lower heating center. This algorithm is specially
designed for application to high altitudes. With this algorithm and the
associated coefficients provided, researchers can readily do LH retrieval in
their cases of interest by themselves. The only required input is the vertical
profile of rain rate, which is available from current satellite precipitation
radar observations.