Gaoyuan qixiang (Dec 2022)
The Mountainous and Plain Areas on the Northeastern Margin of the Qaidam Basin Contrast Study on Raindrop Spectrum Characteristics
Abstract
Based on the rain drop size distribution （DSD） observation data at different altitudes of Zongwulong mountain on the northeast edge of Qaidam Basin from July to September 2020， the contribution of different particle size raindrop microphysical parameters， particle size particle number concentration average spectrum， microphysical characteristic parameters and the relationship between reflectivity factor and rain rate（Z-R） under different rain rate were studied.The results show that the number density of raindrops is mainly contributed by small raindrops， while medium raindrops and heavy raindrops are the main contributions of reflectivity factor Z， rain rate R and liquid water content W.The contribution of heavy raindrops to Z， R and W is higher in Mountain Site with higher altitude.The spectral width of Mountain Site in light rain， moderate rain and heavy rain is wider， and the particle number concentration at the end of heavy rain drops is higher under different rain rate.The lifting of terrain can significantly promote the N（D）of larger raindrops.The mass weighted average diameter （DM） increases with the increase of altitude， and the raindrop diameter increases when R is higher.The generalized truncation parameter （log10Nw） will first increase and then decrease with the increase of rain rate.Smaller raindrops are the main source of rainfall.Rainfall in Qaidam Basin has its unique rain drop size distribution structure characteristics.The distribution of log10Nw and DM of Mountain Site is more discrete， and the log10Nw of Mountain Site is lower and DM is higher than that of Plain Site.If the unified precipitation estimation formula Z=300R1.4 were adopted， the rainfall will be overestimated， and the overestimation of rainfall at Mountain Site will be more serious.
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