FY-3E/GNOSCOSMIC-2掩星数据质量对比分析

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  • 1. 南京信息工程大学大气科学学院,江苏 南京 210044
    2. 南京信息工程大学资料同化研究与应用联合中心,江苏 南京 210044

网络出版日期: 2025-06-04

基金资助

广西重点研发计划(2024AB24046);国家自然科学基金项目(42275005

Comparative and Quality Analysis of Radio Occultation Data from FY-3E/GNOS and COSMIC-2 

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  • 1. Joint Center for Data Assimilation Research and ApplicationNanjing University of Information Science and TechnologyNanjing 210044JiangsuChina
    2. College of Atmospheric ScienceNanjing University of Information Science and TechnologyNanjing 210044JiangsuChina

Online published: 2025-06-04

摘要

掩星数据在数值预报和气候监测中具有重要价值。本研究利用FY-3E/GNOSCOSMIC-2卫星的掩星数据,结合欧洲中期天气预报第五代再分析资料(ERA5),系统分析了两种掩星数据产品在不同高度和纬度下的偏差特征。结果表明,在 5~30 km的高度范围内,FY-3E/GNOSCOSMIC-2的折射率与ERA5数据的一致性较好,偏差小于1%,弯角偏差稳定在±0. 4%以内;但在低层大气(5 km以下),COS‐MIC-2弯角在 4 km 以下出现最大为-1. 2% 的负偏差,FY-3E/GNOS弯角则在 5 km 以下表现出系统性的正偏差,折射率在低纬度区域2 km以下呈负偏差,2~4 km为正偏差。研究发现,FY-3E/GNOS的弯角廊线比COSMIC-2更为平滑,特别是在对流层下层。

本文引用格式

王诗涵, 杨胜朋, 殷延安 . FY-3E/GNOSCOSMIC-2掩星数据质量对比分析[J]. 高原气象, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00020

Abstract

Radio Occultation data are of great value in numerical weather forecasting and climate monitoring. This study evaluates the deviation characteristics of occultation data from the FY-3E/GNOS and COSMIC-2 satellites with ERA5 reanalysis data. The results indicate that FY-3E/GNOS and COSMIC-2 exhibit high consistency with ERA5 in the altitude range of 5 km to 30 kmwith refractivity deviations less than 1% and bending angle deviation is stable within ±0. 4%. Howeverin the lower atmospherebelow 5 km),COSMIC-2 presents a maximum negative bias of -1. 2% at altitudes below 4 kmwhile FY-3E/GNOS demonstrates a systematic positive bi‐ as below 5 km in the bending angleand the refractivity shows negative deviations below 2 km in the low-latitude region and positive deviations from 2 to 4 km. Research findings indicate that the bending angle profiles of FY-3E/GNOS are smoother than those of COSMIC-2especially in the lower troposphere.

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