| 基于探空数据的南海表面波导统计特征研究 |
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| 引用本文： | 成印河,周生启,王东晓,鲁远征,姚景龙.基于探空数据的南海表面波导统计特征研究[J].海洋学报(英文版),2015,34(11):63-70. |
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| 作者姓名： | 成印河 周生启 王东晓 鲁远征 姚景龙 |
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| 作者单位： | 广东省近岸海洋变化与灾害重点实验室, 广东海洋大学海洋与气象学院海洋科学系, 中国湛江, 524088;热带海洋国家重点实验室, 中国科学院南海海洋研究所, 中国广州, 510301,热带海洋国家重点实验室, 中国科学院南海海洋研究所, 中国广州, 510301,热带海洋国家重点实验室, 中国科学院南海海洋研究所, 中国广州, 510301,热带海洋国家重点实验室, 中国科学院南海海洋研究所, 中国广州, 510301,热带海洋国家重点实验室, 中国科学院南海海洋研究所, 中国广州, 510301 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41106011, 41176027, 41406131, 41476009 and 41476167; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302. |
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| 摘 要： | 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.
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| 关 键 词： | GPS探空 表面波导 分布 日变化 季节变化 |
| 收稿时间： | 2015/3/19 0:00:00 |
| 修稿时间： | 6/8/2015 12:00:00 AM |
Statistical characteristics of the surface ducts over the South China Sea from GPS radiosonde data |
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| CHENG Yinhe,ZHOU Shengqi,WANG Dongxiao,LU Yuanzheng and 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. |
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| Authors: | CHENG Yinhe ZHOU Shengqi WANG Dongxiao LU Yuanzheng and YAO Jinglong |
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| Institution: | 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, China2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| 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. |
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| Keywords: | GPS radiosonde surface ducts distribution daily variation seasonal variation |
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