MODIS植被资料在模拟华东地区一次降水中的应用

采用中尺度模式WRF 3.7版本及NCEP FNL资料作驱动场,利用最新的高分辨率MODIS资料(MODIS03)提高WRF模式对区域降水的模拟能力,就2003年6月下旬我国华东地区的一次强降水事件进行48 h短期天气模拟。结果表明,利用最新MODIS03资料的土地利用率可以减少降水误差,植被覆盖率会增加降水量,但同时替换土地利用率和植被覆盖率的LG03试验的模拟结果最接近实测资料。不同的陆面信息可以直接影响地表蒸发量及水汽通量散度的模拟结果。通过分层的水汽通量散度可以看出,不同的陆面信息模拟的水汽辐合主要在地表气压到850 h Pa产生差异,并最终影响降水模拟结果。

Application of MODIS Vegetation Data in Simulating the Precipitation in East China

Using the Weather Research and Forecasting(WRF) Version 3.7 and National Centers for Environmental Prediction (NCEP) FNL data as the driving field,the simulation of a heavy rainfall event occurring in the East China during late June ,2003 was conducted to improve the WRF model forecast skill for precipitation by latest high-resolution MODIS data (MODIS03) on simulated precipitations.The simulation was per-formed in the short-range mode for 48 h intergrations.The results showed that the land use rate of the latest MODIS03 data could reduce the error of precipitation,and the vegetation coverage would increase the precipitation ,but the simulation results of LG 03 test which replaced the land use rate and vegetation coverage was the closest to the observed precipitation.Different land surface information could directly affect the simulation re-sults of surface evaporation and water vapor flux divergence .It can be seen from layered water vapor flux divergence ,the water vapor convergence with different land surface information mainly produced differences from surface air pressure to 850 hPa,and finally affected the simulated precipi-tation results.