文献类型：期刊文献

中文题名：Observed characteristics of atmospheric ducts over the South China Sea in autumn

英文题名：Observed characteristics of atmospheric ducts over the South China Sea in autumn

作者：Cheng Yinhe[1,2];Zhou Shengqi[2];Wang Dongxiao[2];Lu Yuanzheng[2];Huang Ke[2];Yao Jinglong[2];You Xiaobao[3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China;[2]Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;[3]Beijing Inst Appl Meteorol, Beijing 100029, Peoples R China

年份：2016

卷号：34

期号：3

起止页码：619

中文期刊名：Chinese Journal of Oceanology and Limnology

外文期刊名：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000375677600022)、CSTPCD、、CSCD2015_2016、Scopus(收录号：2-s2.0-84966289979)、WOS、CSCD

基金：Supported by the National Natural Science Foundation of China (Nos. 41106011, 41176027) and the National Basic Research Program of China (973 Program) (No. 2011CB403504)

语种：英文

中文关键词：GPS radiosonde; atmospheric ducts; autumn; statistical characteristics

外文关键词：GPS radiosonde; atmospheric ducts; autumn; statistical characteristics

中文摘要：The observed characteristics of lower atmospheric ducts over the South China Sea(SCS) were analyzed based on Global Position Systerm(GPS) radiosonde data collected four times daily during autumn open cruises from 2006 to 2012.Duct occurrence,thickness,and strength over the SCS were about 40%,150-m thick,and 8 M units,respectively,which were larger than during the summer monsoon period.Most ducts occurred at heights <1 500 m and these ducts easily trap electromagnetic wave clusters with wavelengths <2 m.Diurnal variation of the SCS ducts appeared evident.They occurred more often at midnight at higher altitudes(about 1 100 m),with a thickest layer of about 145 m and less frequently during the evening at lower altitudes(about 800 m),with a thinnest layer of about 125 m.Moreover,ducts during the daytime at a mean height of about 900 m,with the greatest strength of about 10 M units.Furthermore,all duct variables observed over the SCS in autumn decreased from north to south.These findings are useful not only in the design of radar and communication systems,but also for evaluating possible effects of anomalous propagation on meteorological radar and military applications.

外文摘要：The observed characteristics of lower atmospheric ducts over the South China Sea (SCS) were analyzed based on Global Position Systerm (GPS) radiosonde data collected four times daily during autumn open cruises from 2006 to 2012. Duct occurrence, thickness, and strength over the SCS were about 40%, 150-m thick, and 8 M units, respectively, which were larger than during the summer monsoon period. Most ducts occurred at heights <1 500 m and these ducts easily trap electromagnetic wave clusters with wavelengths <2 m. Diurnal variation of the SCS ducts appeared evident. They occurred more often at midnight at higher altitudes (about 1 100 m), with a thickest layer of about 145 m and less frequently during the evening at lower altitudes (about 800 m), with a thinnest layer of about 125 m. Moreover, ducts during the daytime at a mean height of about 900 m, with the greatest strength of about 10 M units. Furthermore, all duct variables observed over the SCS in autumn decreased from north to south. These findings are useful not only in the design of radar and communication systems, but also for evaluating possible effects of anomalous propagation on meteorological radar and military applications.