Raindrop size distribution(DSD)plays a crucial role in enhancing the accuracy of radar quantitative precipitation estimates in the Tibetan Plateau(TP).However,there is a notable scarcity of long-term,high-resolution o...Raindrop size distribution(DSD)plays a crucial role in enhancing the accuracy of radar quantitative precipitation estimates in the Tibetan Plateau(TP).However,there is a notable scarcity of long-term,high-resolution observations in this region.To address this issue,long-term observations from a two-dimensional video disdrometer(2DVD)were leveraged to refine the radar and satellite-based algorithms for quantifying precipitation in the hinterland of the TP.It was observed that weak precipitation(R<1,mm h-1)accounts for 86%of the total precipitation time,while small raindrops(D<2 mm)comprise 99%of the total raindrop count.Furthermore,the average spectral width of the DSD increases with increasing rain rate.The DSD characteristics of convective and stratiform precipitation were discussed across five different rain rates,revealing that convective precipitation in Yangbajain(YBJ)exhibits characteristics similar to maritime-like precipitation.The constrained relationships between the slopeΛand shapeμ,D_(m)and N_(w)of gamma DSDs were derived.Additionally,we established a correlation between the equivalent diameter and drop axis ratio and found that raindrops on the TP attain a nearly spherical shape.Consequently,the application of the rainfall retrieval algorithms of the dual-frequency precipitation radar in the TP is improved based on the statistical results of the DSD.展开更多
DVD905E装备了全新开发的“晶锐Clear Vid CMOS感应器”．配合使用新增强型影像处理器．可以同时得到高分辨率和高灵敏度的影像。晶锐Clear Vid CMOS感应器的实际记录像素（静态照片）高达400万像素．动态有效像素高达199万像素（4：3...DVD905E装备了全新开发的“晶锐Clear Vid CMOS感应器”．配合使用新增强型影像处理器．可以同时得到高分辨率和高灵敏度的影像。晶锐Clear Vid CMOS感应器的实际记录像素（静态照片）高达400万像素．动态有效像素高达199万像素（4：3模式）。使用专业高精细卡尔蔡司T＋镜头．能拍摄高质量动态影片和高像素静态照片。DVD905E摄像机拥有广泛的DVD录制兼容性．支持DVDR、DVD-RW和DVD＋RW制式的8cm DVD光盘。展开更多
基金funded by the second Tibetan Plateau Scientific Expe-dition and Research Program(2019QZKK0604).
文摘Raindrop size distribution(DSD)plays a crucial role in enhancing the accuracy of radar quantitative precipitation estimates in the Tibetan Plateau(TP).However,there is a notable scarcity of long-term,high-resolution observations in this region.To address this issue,long-term observations from a two-dimensional video disdrometer(2DVD)were leveraged to refine the radar and satellite-based algorithms for quantifying precipitation in the hinterland of the TP.It was observed that weak precipitation(R<1,mm h-1)accounts for 86%of the total precipitation time,while small raindrops(D<2 mm)comprise 99%of the total raindrop count.Furthermore,the average spectral width of the DSD increases with increasing rain rate.The DSD characteristics of convective and stratiform precipitation were discussed across five different rain rates,revealing that convective precipitation in Yangbajain(YBJ)exhibits characteristics similar to maritime-like precipitation.The constrained relationships between the slopeΛand shapeμ,D_(m)and N_(w)of gamma DSDs were derived.Additionally,we established a correlation between the equivalent diameter and drop axis ratio and found that raindrops on the TP attain a nearly spherical shape.Consequently,the application of the rainfall retrieval algorithms of the dual-frequency precipitation radar in the TP is improved based on the statistical results of the DSD.
文摘DVD905E装备了全新开发的“晶锐Clear Vid CMOS感应器”．配合使用新增强型影像处理器．可以同时得到高分辨率和高灵敏度的影像。晶锐Clear Vid CMOS感应器的实际记录像素（静态照片）高达400万像素．动态有效像素高达199万像素（4：3模式）。使用专业高精细卡尔蔡司T＋镜头．能拍摄高质量动态影片和高像素静态照片。DVD905E摄像机拥有广泛的DVD录制兼容性．支持DVDR、DVD-RW和DVD＋RW制式的8cm DVD光盘。
