介绍了武汉暴雨研究所引进的LAPS系统(Local Analysis and Prediction System)在水汽分析中应用GPS水汽资料的方法。设计三种试验方案与实况进行对比分析,并结合WRF模式模拟,研究GPS水汽资料在LAPS系统中的作用以及对预报的影响。结果表明,LAPS同化GPS水汽资料后,对湿度场产生较大调整;对比各方案LAPS输出的可降水量后发现,GPS水汽资料的作用比雷达资料大一个量级;从模式模拟试验结果比较看出,LAPS对GPS水汽的同化能改善GPS测站分布区域降水预报,并对下游暴雨的预报也有正效果,能提高暴雨量级的Ts降水评分。
Three Envisat images from ESA were used to derive the pre - and co-seismic deformation interfereograms caused by the Damxung Ms6. 6 earthquake of Oct. 6,2008 ,by using InSAR. The result shows no significant crustal motion more than 4 months before the earthquake, but a maximum co-seismic displacement of about 0.3 m in an epicentral area of 20 km × 20 km. The deformation field was symmetrically distributed about a NS axis, where the west side subsided and the east side uplifted. We used a linear elastic dislocation model in half space and a nonlinear constraint optimized algorithm to estimate the slip distribution along the fault. The results indicates that the epicenter is located at 90. 374°E ,29. 745°N with a moment magnitude of Mw6. 35. The earthquake is dominated by normal faulting with a maximum slip of 3 m on a 12 km × 11 km fault plane striking S189°W,dipping 60° to NW at a depth of 9.5 km,and is located at a sub-fault of the southeastern Piedmont of the Nyainqentanglha mountains. The relatively shallow depth of earthquake is related to relatively high heat flow in the area.
Xuejun Qiao Shanjun Ren Zhaosheng Nie Yu Zhou Qiang Shen Shaomin Yang
