摘要
基于中国区域内8个气象站点2012年全年的探空数据,采用射线追踪法计算了各个站天顶方向至4°高度角区间内18个方向的对流层流体静力学和非流体静力学延迟量,将天顶延迟通过NMF、GMF和VMF1三种映射函数投影到各个高度角方向,与射线追踪法得出的延迟量进行比较,结果显示:1 NMF有明显的季节性偏差,且精度与纬度存在强相关性;2 VMF1的精度最高、稳定性最好,但在武汉、长沙等站点存在一定的季节性偏差;3 GMF的精度介于NMF和VMF1之间。
Radiosonde data from 8 stations in China are analyzed based on ray-tracing technology. Hy- drostatic and non-hydrostatic delays for 18 directions, from the zenith to 4° elevation, were computed. The results were compared with 3 mapping functions: NMF, GMF and VMF1, which demonstrate that: (1) there is strong relation between the precision of NMF and the latitude of the station; (2) VMF1 is the most precise and stable mapping function, but with certain seasonal variations when applied in WuHan,ChangSha and some other stations; (3) the precision of GMF falls between that of NMF and VMF1.
出处
《武汉大学学报(信息科学版)》
EI
CSCD
北大核心
2015年第2期182-187,共6页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(41474004)
广西空间信息与测绘重点实验室2011年开放基金资助项目(桂科能1103108-12)
武汉大学实验技术资助项目~~