1.Jiangxi Provincial Meteorological Science Institute, Nanchang 330046, China
2.Key Laboratory of Climate Change Risk and Meteorological Disaster Prevention of Jiangxi Province, Nanchang 330046, China
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文章历史+
Received
Accepted
Published
2023-11-14
Issue Date
2025-07-11
PDF (1921K)
摘要
采用精密单点定位算法对河池、宝山、海口3站地基全球卫星导航系统(Global Navigation Satellite System,GNSS)资料开展6组卫星数据质控方案对大气可降水量(Precipitable Water Vapor,PWV)反演试验,基于探空资料和中国气象局PWV业务产品对反演结果进行精度检验并对比分析各种PWV资料在降水过程中的变化特征。结果表明:卫星数据质控对反演效果影响明显,对残差σ>2的卫星数据进行剔除能有效改进反演效果,反演结果与探空、PWV业务产品的相关系数可提升0.03~0.25,均方根误差可减少0.54~10.7 mm;对进入滤波器前残差>3倍误差的卫星数据以及进入滤波器后σ>2的卫星数据进行剔除后,反演效果最佳,与探空、PWV业务产品的平均相关系数超过0.93,平均偏差为-1.26~-1.91 mm,具有较高的反演精度,可弥补常规PWV资料时间分辨率偏低的不足;反演的PWV对短时强降水发生指示作用较其他2种明显,降水发生前后10~30 min的PWV迅速增加和减少10~15 mm,可以作为局地短时强降水预报的辅助判别条件。
Abstract
This study explores the retrieval of atmospheric Precipitable Water Vapor (PWV) using the Precise Point Positioning (PPP) algorithm with Global Navigation Satellite System (GNSS) data from Hechi, Baoshan, and Haikou stations. Six experimental tests were conducted to assess the impact of satellite data quality control on PWV retrieval accuracy, with results compared with sounding data and operational PWV products from the China Meteorological Administration. The findings reveal that effective quality control significantly enhances retrieval accuracy. By excluding satellite data with residual errors exceeding three times the threshold before filtering, and the satellite data with residual sigma values greater than two after filtering, the correlation coefficients with sounding data or PWV products increased by 0.03 to 0.25, while root mean square errors decreased by 0.54 to 10.7 mm. The highest retrieval accuracy was achieved by filtering satellites with residual errors exceeding the threshold prior to analysis, resulting in an average correlation coefficient above 0.93 and a mean bias of -1.26 to -1.91 mm. This approach effectively addresses the limitations of low temporal resolution in conventional PWV data. Compared to other products,the PWV retrieved using the PPP method also demonstrated improved sensitivity to short-term heavy precipitation events.Notably, it captured rapid PWV variations of 10 to 15 mm within 10 to 30 minutes before and after rainfall, providing a valuable auxiliary indicator for forecasting localized short-term heavy precipitation.
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