Statistical characteristics of the surface ducts over the South China Sea from GPS radiosonde data

CHENG Yinhe; ZHOU Shengqi; WANG Dongxiao; LU Yuanzheng; YAO Jinglong

doi:10.1007/s13131-015-0749-x

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(11): 63-70

CHENG Yinhe, ZHOU Shengqi, WANG Dongxiao, LU Yuanzheng, YAO Jinglong. Statistical characteristics of the surface ducts over the South China Sea from GPS radiosonde data[J]. Acta Oceanologica Sinica, 2015, 34(11): 63-70. doi: 10.1007/s13131-015-0749-x

Citation:

CHENG Yinhe, ZHOU Shengqi, WANG Dongxiao, LU Yuanzheng, YAO Jinglong. Statistical characteristics of the surface ducts over the South China Sea from GPS radiosonde data[J]. Acta Oceanologica Sinica, 2015, 34(11): 63-70. doi: 10.1007/s13131-015-0749-x

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Statistical characteristics of the surface ducts over the South China Sea from GPS radiosonde data

doi: 10.1007/s13131-015-0749-x

1.
Guangdong Province Key Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China;State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2015-03-19
Rev Recd Date: 2015-06-08

Abstract

Abstract

Based on the global position system (GPS) radiosonde data near the sea surface, the surface duct characteristics over the South China Sea (SCS) were statistically analyzed. The annual surface duct occurrence over the SCS was about 64%. Of the observed surface ducts, duct heights mainly distributed between 18 and 42 m, with M slopes in the range of -0.3 to -0.2 M units/m. Those ducts accounted for about 80% of the ducting cases. For the total profiles, the duct occurrences in a day changed slowly and were more than 60% in all times. The surface ducts formed more easily in the daytime than in the nighttime and most of the duct height were at bellow about 32 m. Additionally, The seasonal variation of the SCS ducts appeared to be evident, except that the mean duct thickness was almost constant, about 33 m for all seasons. The highest occurrence was about 71% in the autumn, followed by in the summer, spring and winter. In spring, their top-height existed more often at a height of more than 48 m. Their mean duct strength became stronger trend from spring to winter, with the M-slope in the range between -0.26 and -0.18 M units/m. Those results agreed well with other studies, provided considering the data resolution. The statistical analysis was reliable and gave the duct estimation for the SCS. Such duct climatology not only has important implications for communication systems and the reliability of the radar observation, but also can provide useful information to improve the accuracy of the meteorological radar measurements.
- GPS radiosonde,
- surface ducts,
- distribution,
- daily variation,
- seasonal variation

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References(36)

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