Using raindrop spectrum data observed with four DSG5 precipitation phenomenon instruments deployed at different altitudes in western Sichuan Plateau from June to August 2018, the raindrop number concentration, several microphysical parameters and falling velocity at different regions with high altitude and steep terrain were compared and analyzed.The results show that: The average raindrop spectrums at different altitudes are in good agreement with the Gamma distribution, while completely different characteristics of raindrop spectrum are found between weak and strong rainfall types.For the weak rain types, with increasing altitude, the raindrop number concentration of small particles (D<1 mm) increases and medium diameter particles (1 mm<D<3 mm) decreases slightly.The number concentration Nw increases and the average diameter (Dm) decreases with altitude.For the strong rain types, with increasing altitude, the raindrop number concentration of small and medium particles decreases and larger particles (D>3.25 mm) increases significantly.The number concentration Nw decreases and the average diameter (Dm) increases rapidly.The medium rain types are found to be the conversion phase of raindrop numbers between small and large particles.The falling velocity observed at higher altitude locations is greater than lower altitude in all types of rainfall.
Shanshan LI
,
Xiaofang WANG
,
Rong WAN
,
Guoping LI
. The Characteristics of Raindrop Spectrum in Different Altitude Region on the Eastern Slope of Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2020
, 39(5)
: 899
-911
.
DOI: 10.7522/j.issn.1000-0534.2019.00086
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