Department of Atmospheric Sciencs,Yunnan University,Kunming 650091
Meteorological Observatory of Yunnan Province,Kunming 650034; Yunnan Institute of Meteorology,Kunming 650034; State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081; Meteorological Observatory of Yunnan Province,Kunming 650034
Supported by the Natural Science Foundation of Yunnan Province (U0933603), the Yunnan Province Science and Technology
Program (2009CA023), and the Yunnan Province Key Science and Technology and High-tech Project (2006SG25).
Statistical tests and error analysis of cloud drift winds (CDWs) from the FY-2C satellite were made by
using radiosonde observations. According to the error characteristics of the CDW, a bias correction using
the thermal wind theory was applied in the data quality control. The CDW data were then assimilated into
the GRAPES-meso model via the GRAPES-3DVar. A torrential rain event that occurred in northwestern
China during 1-2 July 2005 was simulated. The results indicate that the CDW data were mainly distributed
above 500 hPa and the largest amount of data were at 250 hPa. The CDW data below 500 hPa had errors in
both the wind direction and wind speed, and the distribution of the errors was irregular, so these data were
discarded. The CDW data above 500 hPa had smaller errors, which presented a Gaussian distribution, so
these data were adopted. With the assimilation of the CDW data, the southwest airflow near the torrential
rain area became stronger in the initial wind field, which intensified the moisture transport and water vapor
flux convergence, and finally improved the accuracy of the 24-h forecast of the torrential rain in both rain
intensity and rain areal coverage.
LI Huahong, WANG Man, XUE Jishan, QI Minghui. 2010: Application of FY-2C Cloud Drift Winds in a Mesoscale Numerical Model. Journal of Meteorological Research, 24(6): 740-748.
LI Huahong, WANG Man, XUE Jishan, QI Minghui. 2010: Application of FY-2C Cloud Drift Winds in a Mesoscale Numerical Model. Journal of Meteorological Research, 24(6): 740-748.
LI Huahong, WANG Man, XUE Jishan, QI Minghui. 2010: Application of FY-2C Cloud Drift Winds in a Mesoscale Numerical Model. Journal of Meteorological Research, 24(6): 740-748.
Citation:
LI Huahong, WANG Man, XUE Jishan, QI Minghui. 2010: Application of FY-2C Cloud Drift Winds in a Mesoscale Numerical Model. Journal of Meteorological Research, 24(6): 740-748.