Validation of Atmospheric Water Vapor Derived from Ship-Borne GPS Measurements in the Chinese Bohai Sea
Validation of Atmospheric Water Vapor Derived from Ship-Borne GPS Measurements in the Chinese Bohai Sea
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中国渤海船载 GPS 测量所得大气水汽的验证
DOI：
10.3319/tao.2015.11.04.01(a
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发表时间：
2016-04-01
影响因子：
0.8
通讯作者：
Zhang, Ke-Fei
中科院分区：
文献类型：
--
作者：
Fan, Shi-Jie;Zang, Jian-Fei;Zhang, Ke-Fei
首次在一艘轻型（300吨级）船舶上使用GPS接收机对渤海大气水汽（AWV）进行了调查。利用GPS精密单点定位（PPP）技术进行了AWV反演实验。在PPP估计系统中，讨论了大气加权平均温度模型和随机游走过程的天顶湿延迟约束对GPS AWV估计的影响。通过与第五代NCAR/Penn State中尺度模式（MM 5）的结果进行比较，对GPS反演的可降水量（PWV）和倾斜路径水汽（SWV）进行了评估。结果表明，GPS和MM 5的PWV和SWV差异分别为1.5 mm RMS和0.2 mm偏差和3.9 mm RMS和-0.7 mm偏差。这些良好的协议表明，GPS派生的AWV在动态环境中具有相当的精度与MM 5模式。这表明利用GPS可以获得高精度和高时空分辨率的渤海湿度场，为该地区的气象应用和气候研究提供了重要的潜力。
Atmospheric water vapor (AWV) was investigated for the first time in the Chinese Bohai Sea using a GPS receiver aboard a lightweight (300-ton) ship. An experiment was conducted to retrieve the AWV using the state-of-the-art GPS precise point positioning (PPP) technique. The effects of atmospheric weighted mean temperature model and zenith wet delay constraint of random walk process on GPS AWV estimates were discussed in the PPP estimation system. The GPS-derived precipitable water vapor (PWV) and slant-path water vapor (SWV) were assessed by comparing with those derived from the Fifth Generation NCAR/Penn State Mesoscale Model (MM5) model. Results showed the PWV and SWV differences between those derived from both GPS and MM5 are 1.5 mm RMS with a bias of 0.2 mm and 3.9 mm RMS with a bias of -0.7 mm respectively. These good agreements indicate that the GPS-derived AWV in dynamic environments has a comparable accuracy with that of the MM5 model. This suggests that high accuracy and high spatio-temporal resolution humidity fields can be obtained using GPS in the Chinese Bohai Sea, which offers a significant potential for meteorological applications and climate studies in this region.