The Global and Regional Assimilation and Prediction System (GRAPES), a limited-area regional model, was used to simulate the onset of South China Sea summer monsoon. In view of the relatively insufficient information ...The Global and Regional Assimilation and Prediction System (GRAPES), a limited-area regional model, was used to simulate the onset of South China Sea summer monsoon. In view of the relatively insufficient information about the initial field in simulation predictions, the Advanced Microwave Sounding Unit-B (AMSU-B) data from a NOAA satellite were introduced to improve the initial values. By directly using the 3-dimensional variational data assimilation system of GRAPES, two schemes for assimilation tests were designed. In the design, Test 1 (T1) assimilates both sounding and AMSU-B data, and Test 2 (T2) assimilates only the conventional sounding data, before applying the model in simulation forecasts. Comparative experiments showed that the model was very sensitive to initial fields and successful in reproducing the monsoon onset, allocation of high- and low-level wind fields during the pentad of onset, and the northward advancement of the monsoon and monsoon rain bands. The scheme, however, simulated rainfall and the location of the subtropical high with deviations from observations. The simulated location of the subtropical high was more westward and northward and the simulated rainfall for the South China Sea was larger and covered a broader area.展开更多
[Objective] The aim was to analyze climate resources in south Dongting Lake wetland. [ Method] By dint of the temperature, precipitati- on, sunshine, general cloud, relative humidity and disastrous climate days, the c...[Objective] The aim was to analyze climate resources in south Dongting Lake wetland. [ Method] By dint of the temperature, precipitati- on, sunshine, general cloud, relative humidity and disastrous climate days, the climate resources of wetland in south Dongting Lake were analyzed from the angle of climate characteristics and adaptability. [ Result] The climate was beautiful in south Dongting Lake. The period suitable for travel- ling is from September to next May. The optimal travelling period is from Mid September to last ten days of November, Mid March to last ten days of May. According to the analysis of climate elements, though there are some unfavorable climate factors influencing outdoor activity, they occurred less frequently and had little influence on travelling activity. [ Condusion] The study provided reference for climate resources utilization and the de- velopment of tourism and travelling activity.展开更多
基金National 863 Special Project (2006AA01A123)Research on Interpretation Techniques for High-Resolution Numerical Prediction of Hunan ProvinceResearch on Rainstorm Forecast System with GRAPES and Its Application and Accessment in Hunan and Key Project of Science in Hunan (2008FJ1006)
文摘The Global and Regional Assimilation and Prediction System (GRAPES), a limited-area regional model, was used to simulate the onset of South China Sea summer monsoon. In view of the relatively insufficient information about the initial field in simulation predictions, the Advanced Microwave Sounding Unit-B (AMSU-B) data from a NOAA satellite were introduced to improve the initial values. By directly using the 3-dimensional variational data assimilation system of GRAPES, two schemes for assimilation tests were designed. In the design, Test 1 (T1) assimilates both sounding and AMSU-B data, and Test 2 (T2) assimilates only the conventional sounding data, before applying the model in simulation forecasts. Comparative experiments showed that the model was very sensitive to initial fields and successful in reproducing the monsoon onset, allocation of high- and low-level wind fields during the pentad of onset, and the northward advancement of the monsoon and monsoon rain bands. The scheme, however, simulated rainfall and the location of the subtropical high with deviations from observations. The simulated location of the subtropical high was more westward and northward and the simulated rainfall for the South China Sea was larger and covered a broader area.
文摘[Objective] The aim was to analyze climate resources in south Dongting Lake wetland. [ Method] By dint of the temperature, precipitati- on, sunshine, general cloud, relative humidity and disastrous climate days, the climate resources of wetland in south Dongting Lake were analyzed from the angle of climate characteristics and adaptability. [ Result] The climate was beautiful in south Dongting Lake. The period suitable for travel- ling is from September to next May. The optimal travelling period is from Mid September to last ten days of November, Mid March to last ten days of May. According to the analysis of climate elements, though there are some unfavorable climate factors influencing outdoor activity, they occurred less frequently and had little influence on travelling activity. [ Condusion] The study provided reference for climate resources utilization and the de- velopment of tourism and travelling activity.
