Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 118, Issue 5, Pages 2422-2433Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/jgrd.50251
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Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA05040000]
- National Natural Science Foundation of China (NSFC) [40775002, 41175020]
- National High Technology Research and Development Program (863 Major Project) of China [SQ2010AA1221583001]
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Lidar has unique advantages in temporal and spatial resolution to measure the atmospheric mixing layer height (MLH), which is important for analyzing atmospheric phenomena. However, long-term MLH information over several years, which has important significance in air quality and climate studies, is seldom obtained from lidar data due to the scarcity of long-running lidar observations. In this paper, we retrieve and analyze daytime MLH from a data set of a lidar that operated continuously over 6.5 years at Yuen Long, Hong Kong. A new algorithm has been developed for consistently retrieving MLH from this large data set, handling all possible weather conditions and aerosol layer structures. We analyze the diurnal, seasonal and inter-annual variation of MLH over Hong Kong and find a unique phenomenon that the afternoon MLH is higher in autumn than in summer, which is verified by radiosonde results and explained by thermal stability and humidity effect. Moreover, we find a slightly decreasing trend of the daily maximum of MLH, which implies a continually compressed air volume into which pollutants and their precursors are emitted, which is one of the possible factors leading to deteriorated air quality over Hong Kong region. Citation: Yang, D. W., C. Li, A. K.-H. Lau, and Y. Li (2013), Long-term measurement of daytime atmospheric mixing layer height over Hong Kong, J. Geophys. Res. Atmos., 118, 2422-2433, doi: 10.1002/jgrd.50251.
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