| 顾及垂直递减率的中国区域Tm格点产品空间插值 |
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| 引用本文： | 黄良珂,李琛,谢劭峰,刘立龙,陈军,黎峻宇.顾及垂直递减率的中国区域Tm格点产品空间插值[J].武汉大学学报(信息科学版),2023,48(2):295-300. |
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| 作者姓名： | 黄良珂 李琛 谢劭峰 刘立龙 陈军 黎峻宇 |
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| 作者单位： | 1.桂林理工大学测绘地理信息学院, 广西 桂林, 541006 |
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| 基金项目： | 国家自然科学基金41704027国家自然科学基金41664002国家自然科学基金41864002广西自然科学基金2017GXNSFBA198139广西自然科学基金2017GXNSFDA198016广西自然科学基金2018GXNSFAA281182 |
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| 摘 要： | 大气加权平均温度(Tm)是全球导航卫星系统(global navigation satellite system, GNSS)反演大气水汽(precipitation water vapor, PWV)的关键参数。当前已有Tm模型提供的Tm信息难以捕获其日周期变化，因此限制了其在高时间分辨率GNSS PWV估计中的精度。大气再分析资料可提供高时空分辨率的Tm格点产品，但是在使用时需要对其进行空间插值，且Tm在高程上的变化远大于其在水平方向上变化。同时，针对中国区域地形起伏大等特点，提出顾及垂直递减率的中国区域Tm格点产品空间插值方法，以分布于中国区域的2015年89个探空站资料为参考值，验证了提出的方法在全球大地测量观测系统大气中心Tm格点产品和美国国家航空和太空管理局提供的MERRA-2的Tm格点产品中的空间插值精度。结果表明：(1)在顾及垂直递减率的Tm格点产品空间插值中，反距离加权法的...
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| 关 键 词： | 大气加权平均温度 全球大地测量观测系统大气中心 MERRA-2 垂直递减率 |
| 收稿时间： | 2021-07-31 |
Spatial Interpolation of Atmospheric Weighted Mean Temperature Grid Products in China with Consideration of Vertical Lapse Rate |
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| Affiliation: | 1.College of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541006, China2.Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin 541006, China3.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China |
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| Abstract: | Objectives Atmospheric weighted mean temperature (Tm) is a key parameter of global navigation satellite system (GNSS) to retrieve precipitable water vapor (PWV). Currently, the Tm information provided by the existing Tm model is hard to capture its diurnal cycle variation, thus its application in high time resolution GNSS PWV estimation is limited. Atmospheric reanalysis data can provide Tm grid products with high spatial and temporal resolution, but they need to be spatially adjusted when used, and the variation of Tm in elevation is much greater than that in horizontal direction. Methods Moreover, for the highly undulating terrain in China, a spatial interpolation method which considering the vertical lapse rate is proposed for Tm grid products in China. The proposed method is verified with the global geodetic observing system (GGOS) atmosphere Tm grid product and the MERRA?2 Tm grid product provided by national aeronautics and space administration using the data of 89 radiosonde stations distributed in China as reference values. Results The results show that: (1) In spatial interpolation of Tm grid products considering vertical lapse rate, the performance of inverse distance weighted method is better than that of bilinear interpolation method, and the biases of the Tm grid products of GGOS atmospheric center and MERRA?2 in China are 0.72 K and 0.23 K, respectively, and the root mean square errors are 1.94 K and 1.87 K, respectively. (2) The performance of spatial interpolation which considering the vertical lapse rate is significantly better than that without vertical lapse rate, especially in western China where the terrain is undulating. Conclusions Therefore, the spatial interpolation method which considering the vertical lapse rate has important applications in high-precision and high-resolution GNSS water vapor remote sensing for China. |
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