高原气象

高原气象 >

2020 , Vol. 39 >Issue 1: 196 - 203

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00065

论文

FY‑4A卫星云顶参数精度检验及台风应用研究

  • 崔林丽 ,
  • 郭巍 ,
  • 葛伟强 ,
  • 燕亚菲 ,
  • 罗双
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  • <sup>1.</sup>上海市生态气象和卫星遥感中心, 上海 200030<br/><sup>2.</sup>上海市气象与健康重点实验室, 上海;200030

收稿日期: 2019-05-06

  网络出版日期: 2020-02-28

基金资助

上海市自然科学基金项目(18ZR1434100);华东区域气象科技协同创新基金合作项目(QYHZ201611);上海气象科技联合中心合作基金项目(LHZX201601)

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Comparisons of Cloud Top Parameter of FY‑4A Satellite and its Typhoon Application Research

  • Linli CUI ,
  • Wei GUO ,
  • Weiqiang GE ,
  • Yafei YAN ,
  • Shuang LUO
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  • <sup>1.</sup>Shanghai Ecological Forecasting and Remote Sensing Center, Shanghai 200030, China;<sup>2.</sup>Shanghai Key Laboratory of Meteorology and Health, Shanghai 200030, China

Received date: 2019-05-06

  Online published: 2020-02-28

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摘要

基于2018年中国东南沿海台风观测实例, 以美国EOS/MODIS极轨气象卫星和日本第二代静止气象卫星Himawari?8为参照, 对我国FY?4A静止气象卫星的云顶高度（Cloud Top Height, CTH）、 云顶温度（Cloud Top Temperature, CTT）和云顶气压（Cloud Top Pressure, CTP）三个产品的精度进行了对比, 并分析了其在台风应用中的表现。结果表明: FY?4A卫星云顶参数产品与MODIS和Himawari?8同类产品均具有很好的线性相关关系, 其中FY?4A与MODIS的相关系数最大（r≥0.98）, 平均值偏差最小, 特别是在具有深厚密蔽云的台风中心和内雨带区, 各卫星反演参数的精度更加接近, 如在台风中心, FY?4A与Himawari?8的CTT、 CTH和CTP分别相差0.78 ℃、 30 m和0.2 hPa。FY?4A云顶参数产品质量可靠, 与MODIS和Himawari?8等国际同类卫星精度相当, 适合深厚的台风云系分析。偏差产生主要受透明薄卷云和小尺度云存在的影响, 这与仪器的空间分辨率、 不同仪器对云的探测能力以及云检测算法相关。

关键词： 风云四号; 云顶高度; 云顶温度; 云顶气压; 交叉验证

本文引用格式

崔林丽 , 郭巍 , 葛伟强 , 燕亚菲 , 罗双 . FY‑4A卫星云顶参数精度检验及台风应用研究[J]. 高原气象, 2020 , 39(1) : 196 -203 . DOI: 10.7522/j.issn.1000-0534.2019.00065

Abstract

Clouds reflect the dynamic of atmosphere and the thermal processing. Parameters such as cloud top temperature and cloud top height are significant for diagnosing the intensity of weather system and convection development, and they are important roles in weather analysis, numerical forecast and aviation meteorology. Fengyun?4 (FY?4A) satellite is the second generation of stationary meteorological satellite independently developed by China. Compared with the Fengyun?2(FY?2) meteorological satellite, FY?4A satellite's performance has been significantly improved. For example, the observation channels has been expanded from 5 to 14, the observation time of the whole disk image has been shortened from 0.5 h to 15 min, and the maximum spatial resolution has been improved from 1.25 km to 0.5 km. Therefore, FY?4A satellite's products have been increased 160 times than FY?2 satellite's. As the first satellite of scientific experiments, FY?4A is mainly used to validate new technologies and develop new applications. In order to evaluated and analyzed the accuracy of FY?4A satellite's products during the period of typhoons processes near the coastal area of Southeast China in 2018, three main products have been compared with the polar orbiting meteorology satellite of American EOS/MODIS's products and the second generation geostationary meteorological satellite of Japanese Himawari?8's products, including cloud top height (CTH), cloud top temperature (CTT) and cloud top pressure (CTP). The results indicated that the cloud top parameters obtained from FY?4A satellite had a high linear correlation with MODIS and Himawari?8 products as a whole. FY?4A was highly linearly correlated with MODIS, and the correlation coefficient was above 0.98, and the overall mean bias was the smallest. Particularly, in the typhoon center and eye wall area with deep and dense cloud, the mean bias of inter?satellite results was obviously reduced. For example, FY?4 A differed from himawari ?8 by 0.78 oC in CTT, 30 m in CTH and 0.2 hPa in CTP at the center of typhoon, and the mean bias between FY?4A and MODIS or the mean bias between Himawari?8 and MODIS was also small. Therefore, the quality of FY?4A cloud top parameters is reliable; the precision of FY?4A satellite's cloud products is comparable to those of MODIS and Himawari?8 satellites, which is suitable for analyzing typhoon's deep cloud structure. The reason for the bias was initially analyzed as the influence of the existence of transparent thin cirrus clouds and small?scale clouds, which were related to the spatial resolution of different instruments, cloud detection ability of different instruments and cloud detection algorithm and so on.

Key words： FY?4A; cloud top height; cloud top temperatur; cloud top pressure; intercomparisons

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