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Author Cai, Hongke ♦ Fu, Yunfei ♦ Chen, Quanliang ♦ Feng, Xiao ♦ Tie, Xin ♦ Tao, Ranting ♦ Xu, Kepiao
Source SpringerLink
Content type Text
Publisher The Chinese Meteorological Society
File Format PDF
Copyright Year ©2017
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences
Subject Keyword cirrus ♦ transition zone ♦ lidar ♦ temperature ♦ wind speed ♦ Atmospheric Sciences ♦ Meteorology ♦ Geophysics and Environmental Physics ♦ Atmospheric Protection/Air Quality Control/Air Pollution
Abstract A transition zone near cirrus lateral boundaries can be detected by CALIOP (cloud–aerosol lidar with orthogonal polarization). In the present study, for such transition zones over China, a number of optical properties, such as the backscatter coefficient and depolarization ratio, showed transitional characteristics between cirrus and clear sky. The stepped horizontal profile showed sharp changes in particle number and morphology between cirrus clouds and clear sky. The color ratio, however, was unable to show cirrus transition features because of the low signal-to-noise ratio. Typical ice particles presented a color ratio of 0.55–1.25 and a depolarization ratio of greater than 0.12, which were significantly higher than those of clear sky. Therefore, optical properties in transition took the form of stepwise horizontal profiles. The proportion of typical-featured particles also demonstrated a stepped horizontal profile similar to the optical characteristics, but the relationship between the proportion and the optical characteristics was not uniform in the cirrus clouds, transition zone, and clear sky. Therefore, the optical changes in the transition zone were caused by not only the change in particle concentration, but also the change in the particles themselves. The probability density distribution of the transition-zone widths showed a positive skewness distribution, and transition zones with widths of 3–5 km occurred most frequently. Overall, transition-zone width decreased with increasing temperature and increased with increasing vertical and horizontal wind speeds. This trend demonstrated independence with the direction of the vertical and horizontal winds. These observations implied that the transitional features were caused by material exchange, such as entrainment and turbulent transport, near the cirrus lateral boundaries, and by the phase transformation of particles, such as sublimation.
ISSN 20956037
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2017-07-14
Publisher Place Beijing
e-ISSN 21980934
Journal Journal of Meteorological Research
Volume Number 31
Issue Number 3
Page Count 10
Starting Page 576
Ending Page 585


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Source: SpringerLink