AIRBORNE MEASUREMENTS OF MICROPHYSICAL CHARACTERISTICS OF WARM STRATUS CLOUDS IN WINTER NANNING, GUANGXI
MA Xin-cheng
CHENG Peng
BI Kai
WANG Ji
WEI Zeng-an
HUANG Meng-yu
JIN Hua
ZHANG Lei
Abstract：Microphysical characteristics of warm layer clouds in winter Nanning,Guangxi are statistically analyzed based on 12 flights of airborne instruments with a Y-12 aircraft.The results show that the clouds vary obviously by layers vertically.As a typical macrophysical characteristic of the layer clouds,the temperature inversion appears in precipitation clouds,with several layers of temperature inversion.Temperature inversion often appears near the cloud top.Secondly,for the 12 flight cases,the mean number concentration of cloud droplets is 652± 607 cm-3.The concentration in non-precipitation clouds is larger than in precipitation clouds,with the values being 678± 348 cm-3 and 615± 363 cm-3 respectively.The average liquid water content (LWC) is 1.03 ± 0.73 g/m3.LWC in precipitation clouds is 1.3 ± 0.9 g/m3,which is apparently larger than in non-precipitation clouds (0.88± 0.6 g/m3).The mean effective diameter (ED) is 18.2± 5.6 μm.In precipitation clouds,the ED is 19.4± 5.0 μm,while it is 17.3± 6.0 μm in non-precipitation clouds.Furthermore,the peak value of cloud number concentration is at cloud base in lower clouds.It decreases with the height.Most of the droplets are less than 50 μm.The second peak value of the PSD is about 6.5 μm.From the cloud droplet images in precipitation clouds,it is known that large droplets are at lower layer clouds with great number.But in non-precipitation clouds,unusually big cloud droplets could be found.
Keywords：cloud microphysical characteristicsflight measurementwarm stratus cloudswinterGuangxi
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 922-932 )