globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017JD027615
论文题名:
Improved boundary layer height measurement using a fuzzy logic method: Diurnal and seasonal variabilities of the convective boundary layer over a tropical station
作者: Allabakash S.; Yasodha P.; Bianco L.; Venkatramana Reddy S.; Srinivasulu P.; Lim S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
语种: 英语
英文关键词: Boundary layer ; Diurnal and seasonal variations ; Fuzzy logic ; Radar observations ; Radiosonde observations ; Wind profilers
英文摘要: This paper presents the efficacy of a "tuned" fuzzy logic method at determining the height of the boundary layer using the measurements from a 1280 MHz lower atmospheric radar wind profiler located in Gadanki (13.5°N, 79°E, 375 mean sea level), India, and discusses the diurnal and seasonal variations of the measured convective boundary layer over this tropical station. The original fuzzy logic (FL) method estimates the height of the atmospheric boundary layer combining the information from the range-corrected signal-to-noise ratio, the Doppler spectral width of the vertical velocity, and the vertical velocity itself, measured by the radar, through a series of thresholds and rules, which did not prove to be optimal for our radar system and geographical location. For this reason the algorithm was tuned to perform better on our data set. Atmospheric boundary layer heights obtained by this tuned FL method, the original FL method, and by a "standard method" (that only uses the information from the range-corrected signal-to-noise ratio) are compared with those obtained from potential temperature profiles measured by collocated Global Positioning System Radio Sonde during years 2011 and 2013. The comparison shows that the tuned FL method is more accurate than the other methods. Maximum convective boundary layer heights are observed between ~14:00 and ~15:00 local time (LT = UTC + 5:30) for clear-sky days. These daily maxima are found to be lower during winter and postmonsoon seasons and higher during premonsoon and monsoon seasons, due to net surface radiation and convective processes over this region being more intense during premonsoon and monsoon seasons and less intense in winter and postmonsoon seasons. © 2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62778
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Korea Institute of Civil Engineering and Building Technology Ilsan South Korea; National Atmospheric Research Laboratory Department of Space Gadanki India; Cooperative Institute for Research in Environmental Sciences (CIRES) Boulder, Colorado USA; NOAA/Earth System Research Laboratory/Physical Sciences Division Boulder, Colorado USA; Department of Physics Sri Venkateswara University Tirupati India; Astra Microwave Products Limited Hyderabad India

Recommended Citation:
Allabakash S.,Yasodha P.,Bianco L.,et al. Improved boundary layer height measurement using a fuzzy logic method: Diurnal and seasonal variabilities of the convective boundary layer over a tropical station[J]. Journal of Geophysical Research: Atmospheres,2017-01-01
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