FY-3E/GNOS和COSMIC-2掩星数据质量对比分析
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
Online published: 2025-06-04
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/GNOS和COSMIC-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/GNOS和 COSMIC-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。
王诗涵, 杨胜朋, 殷延安 . FY-3E/GNOS和COSMIC-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
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 km,with refractivity deviations less than 1% and bending angle deviation is stable within ±0. 4%. However,in the lower atmosphere(below 5 km),COSMIC-2 presents a maximum negative bias of -1. 2% at altitudes below 4 km,while FY-3E/GNOS demonstrates a systematic positive bi‐ as below 5 km in the bending angle,and 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-2,especially in the lower troposphere.
Key words:
refractivity; GNSS RO; quality analysis
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