Application Validity of Wind Profiler in Typhoon Environment

Abstract

This study investigates the feasibility of wind profiler in the typhoon observation. From six typhoon cases during 2014 to 2019, 34 groups datasets, the Airda3000 boundary layer wind profiler and GPS balloon sounding data are selected to be compared. Preliminary analysis shows that 30 out of 34 datasets satisfy the prerequisite condition of greater than 80% data completion. These 30 datasets have an average standard deviation of about 3.64m/s and average difference of 4.67m/s. Furthermore, 20 out of 34 datasets achieved good results (standard deviation < 4 and correlation >0.5) with much overlap of 2 lines above 250m altitude, and less overlap of 2 lines below that altitude, Moreover, the sounding wind speed is observed to be much smaller than the wind profiler data for altitudes below 250m, likely due to the fact that sounding accelerates from stationary to consistent with environmental winds at altitudes below 250m in typhoon environment. This may also be due to disturbance in lower atmosphere of wind profiler which earlier studies mentioned. Thus, while ignoring the lowest 250m region, the standard deviation of profiler and balloon sounding decreased remarkably. This may implied that wind profiler may have very high feasibility in the region of boundary layer from 250 m to the top of boundary layer under typhoon environment. In addition, data with lower validity are always located in the region which is about more than 200km away from typhoon center, while the distribution of high validity data observation does not showed an obvious pattern and located from typhoon center to the outer region. There are also no relationship found between data validity and precipitation intensity. These two founding may implied that wind profiler may have great utility and potential under the condition of heavy precipitation and severe wind. Despite very limited data we collected in study, wind profiler shows an very hopeful potential and higher validity in the observation and diagnosis of boundary layer even in severe convective weather environment such as typhoon inner core regions.