Assessing CINRAD Radar Detection Environment in Fujian Province by Three Methods
The new generation of weather radar network in China still has large blind spots in hilly and mountainous regions,lacking comprehensive coverage assessment of the lower atmosphere.The focus of our study is on evaluating the low-level atmosphere detection environment of radar in Fujian Province to aid in selecting radar sites to fill these gaps.Using high resolution terrain data from the Shuttle Radar Topography Mission(SRTM)and three site selection methods,this article analyzes the detection environment of eight operational CINRAD/SA radars in Fujian Province from the elevation angles ranging from 0.5° to 3.4°.The analysis is conducted on the radar single-station coverage range and coverage overlap,and the radar network coverage.Among them,Methods 1,Methods 2 and Methods 3 are used in evaluating radar coverage at different altitudes,vertical heights from the ground,and altitudes above the feed sources,respectively.The results show that Methods 1 and 2 are proved to be more effective in evaluating radar detection environment in lower atmosphere.For instance,Method 2 can be used to calculate the atmospheric detection blind areas within the 0～2 km interval,and analyze the effectiveness of newly built radars in filling these blind spots.The results reveal that blind areas are predominantly situated in central,southwestern and northern parts of Fujian Province.If the gap-filling radar is located in the southwestern region of Fujian,it can maximize the increase of coverage area for radar beams at 0 to 2 km altitude.According to the calculation,the added area could exceed 15,000 km2.
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