东台之气候     

王庭芳 《气象学报》1938,(3):19-22

一引论东台位于北纬33°10′,东经120°33′盛产米稻,地位滨海,近来大海东移,昔年渺无人烟之沙滩,一变而为可利用之陆地,垦殖事业,日益兴盛,惜国人注意者不多,而日人反有巨额投资。兹篇因纪录年份太短,仅可知梗概,欲译论其气候情况,则尚有俟于异日,然想亦为关心柘殖事业者所乐闻也。(本文纪录采自气  相似文献   

A Precipitation Detection Method for MWTS-Ⅱ Radiance Assimilation in Typhoon Simulation     

袁炳  马刚  张鹏  希爽  王庭芳 《热带气象学报(英文版)》2020,26(2):150-160

FY-3C Microwave Temperature Sounder Ⅱ(MWTS-Ⅱ) lacks observations at 23.8 GHz, 31 GHz and 89 GHz,making it difficult to remove the data contaminated by precipitation in assimilation. In this paper, a fast forward operator based on the Community Radiative Transfer Model(CRTM) was used to analyze the relationship between the observation minus background simulation(O-B) and the cloud fractions in different MWTS-Ⅱ channels. In addition,based on the community Gridpoint Statistical Interpolation(GSI) system, the radiation brightness temperature of the MWTS-Ⅱ was assimilated in the regional Numerical Weather Prediction(NWP) model. In the process of assimilation,Visible and Infrared Radiometer(VIRR) cloud detection products were matched to MWTS-Ⅱ pixels for precipitation detection. For typhoon No. 18 in 2014, impact tests of MWTS-Ⅱ data assimilation was carried out. The results show that,though the bias observation minus analysis(O-A) of assimilated data can be reduced by quality control only with | O-B| 3 K; however, the O-A becomes much smaller while the precipitation detection is performed with F_(virr) 0.9(VIRR cloud fraction threshold of 0.9). Besides, the change of the environmental field around the typhoon is more conducive to make the simulated track closer to the observation. The 72-hour typhoon track simulation error also shows that, after the precipitation detection, the error of simulated typhoon track is significantly reduced, which reflects the validity of a precipitation detection method based on a double criterion of | O-B | 3 K and F_(virr) 0.9.  相似文献