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气象:2019,45(4):458-468
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FY-4A云导风在GRAPES_RAFS中的同化应用评估
万晓敏,龚建东,韩威,田伟红
(国家气象中心,北京 100081)
The Evaluation of FY-4A AMVs in GRAPES_RAFS
WAN Xiaomin,GONG Jiandong,HAN Wei,TIAN Weihong
(National Meteorological Centre, Beijing 100081)
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投稿时间:2018-05-16    修订日期:2018-09-03
中文摘要: 云导风资料具有较高的时空分辨率特性,是数值天气预报中重要的非常规观测资料之一。2016年12月我国第二代静止气象卫星风云四号首颗试验卫星(FY-4A)成功发射。依据国家卫星气象中心提供的2017年8月FY-4A卫星红外和高空、低空水汽通道云导风测试数据,选用美国国家环境预报中心的FNL全球分析资料为参考场,对比分析云导风资料观测分布及偏差特征。评估结果表明,FY-4A云导风测试数据分布稳定,水汽通道云导风资料观测数明显多于红外通道;红外通道云导风资料偏差和均方根误差最小,水汽通道云导风资料在高层偏差较大。基于GRAPES_RAFS系统,选取2017年第13号台风天鸽做24 h预报试验。个例试验结果表明,同化FY-4A云导风资料对模式高度场和风场分析有一定调整作用,特别是同化FY-4A水汽通道云导风资料,对强降水落区和强度预报有所改善。
Abstract:Atmospheric motion vectors (AMVs) can supply plenty of useful information for numerical weather prediction. With the launch of the Chinese next generation geostationary meteorological satellite FY-4A in December 2016, it is necessary to evaluate the quality of FY-4A AMVs for the analysis field and precipitation forecast by GRAPES of CMA. In this study, by comparing with the background field based on NCEP FNL data, the qualities of FY-4A AMVs were assessed, and the results suggested that the distribution of FY-4A is stable and the quality of FY-4A infrared AMVs is better than FY-4A water vapor AMVs. Based on GRAPES_RAFS, three numerical experiments were conducted to examine the impact on analysis and forecast for severe Typhoon Hato at 0000 UTC 23 August 2017. The findings showed that assimilating FY-4A AMVs, especially FY-4A water vapor AMVs, has certain adjusting effect on wind and height analysis fields. Furthermore, due to the improvement of the initial fields for the model prediction, the performance of the precipitaion forecast was improved. Conclusively, the FY-4A AMVs have positive impact on analysis field and precipitation forecast of GRAPES.
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基金项目:GRAPES专项(GRAPES-FZZX-2018-05)、公益性行业(气象)科研专项(GYHY201506002和GYHY201506022)及国家气象中心青年基金(Q201705)共同资助
引用文本:
万晓敏,龚建东,韩威,田伟红,2019.FY-4A云导风在GRAPES_RAFS中的同化应用评估[J].气象,45(4):458-468.
WAN Xiaomin,GONG Jiandong,HAN Wei,TIAN Weihong,2019.The Evaluation of FY-4A AMVs in GRAPES_RAFS[J].Meteor Mon,45(4):458-468.