利用GPAS解算不同气象模型反演大气降水精度检验Inversion of atmospheric precipitation accuracy test by using GPAS to solve different meteorological models
任政兆,党亚民,许长辉
摘要(Abstract):
针对GNSS气象学中大气可降水量在局域不同气象模型的差异,该文选取香港12个CORS站2017—2018年两年的观测数据,借助中国测绘科学研究院自主研发的高精度GNSS数据处理软件(GPAS),分别采用实测气象数据、GPT模型以及标准海平面气象模型进行大气可降水量(PWV)反演,探究各个模型精度。以探空数据为参考,对3种方案解算的GPS/PWV进行年、季度、月综合对比和精度分析。结果表明:香港地区PWV值呈现出夏季大、冬季小的特征;3种方案的GPS/PWV与RAD/PWV具有很好的相关性,相关系数均超过0.97;其中利用实测气象数据精度最高,标准海平面模型精度最低,尤其当天气状况比较复杂时候(PWV>60 mm)精度相差较大;GPT模型和实测数据的平均偏差都小于1 mm,均方差均小于1.9 mm,在缺少地面气象数据的时间段或没有地面气象数据的测站上,利用GPT模型数据能够取得较为理想的PWV反演结果。
关键词(KeyWords): 地基GPS;数据处理;水汽反演;探空数据
基金项目(Foundation): 国家重点研发计划项目(2016YFB0501405);; 国家自然科学基金面上项目(41874042);; 全球连续监测评估系统项目(CFZX0301040308-06);; 中国测绘研究院基本科研业务费项目(AR1930)
作者(Author): 任政兆,党亚民,许长辉
DOI: 10.16251/j.cnki.1009-2307.2020.04.003
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