EPS-Sterna 微波星座全球观测系统模拟实验

IF 3 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Louis Rivoire, Robin Marty, Thomas Carrel‐Billiard, Philippe Chambon, Nadia Fourrié, Olivier Audouin, Maud Martet, Camille Birman, Christophe Accadia, Jörg Ackermann
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引用次数: 0

摘要

欧洲气象卫星应用组织(EUMETSAT)正在研究一个名为 "EUMETSAT 极地系统-斯特纳"(EPS-Sterna)的微波探测仪星座,目的是补充低地球轨道全球观测系统的主干轨道。该星座的卫星将与欧洲航天局(ESA)正在开发的北极气象卫星(AWS)类似。北极气象卫星上的微波探测仪配有 50 千兆赫氧气吸收波段附近的温度探测通道、183 千兆赫和 325 千兆赫吸收波段附近的水蒸气探测通道以及 89 千兆赫和 165 千兆赫的窗口通道。国家气象研究中心(CNRM)进行了一次观测系统模拟实验(OSSE),以评估该星座在全球范围内使用小埃歇尔大埃歇尔研究行动(ARPEGE)模型对数值天气预报(NWP)的影响。我们选择了 2021 年 8 月至 10 月和 2021 年 12 月至 2022 年 2 月这两个时间段来计算自然运行和运行 4D-Var 数据同化实验。作为对 OSSE 框架的验证,将 OSSE 中 Metop-B 否定实验的影响与利用实际观测数据进行 Metop-B 否定实验的影响进行了比较。比较结果表明,在 OSSE 和实际观测中,Metop-B 拒绝的影响非常相似,OSSE 略微高估了影响。然后,通过计算预报误差、分数技能得分和湿润全球能量标准,评估了 EPS-Sterna 星座的各种方案的影响,并将这些结果与没有 EPS-Sterna 星座的基线实验结果进行了比较。结果表明,在 96 小时内,对每个测试变量的预报都有显著和积极的改进,其影响随卫星数量的增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A global observing‐system simulation experiment for the EPS–Sterna microwave constellation
A constellation of microwave sounders named the EUMETSAT Polar System–Sterna (EPS–Sterna) is under study at the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT), with the aim of complementing the backbone orbits of the global observing system in low Earth orbit. The satellites of this constellation would be similar to the Arctic Weather Satellite (AWS), which is being developed by the European Space Agency (ESA). The microwave sounder on board AWS is equipped with temperature sounding channels around the 50‐GHz oxygen absorption band, water‐vapour sounding channels around the 183‐ and 325‐GHz absorption bands, and also window channels at 89 and 165 GHz. An observing‐system simulation experiment (OSSE) has been conducted at the Centre National de Recherches Météorologiques (CNRM) to evaluate the impact of this constellation on numerical weather prediction (NWP) at the global scale with the Action de Recherche Petite Echelle Grande Echelle (ARPEGE) model. Two periods ranging from August–October 2021 and December 2021–February 2022 have been chosen to compute the nature run and to run 4D‐Var data assimilation experiments. As validation of the OSSE framework, the impact of a Metop‐B denial experiment in the OSSE is compared with the impact of a Metop‐B denial with real observations. This comparison shows that the Metop‐B denial impacts are very similar in the OSSE and with real observations, with the OSSE slightly overestimating the impact. Then, the impacts of various scenarios for the EPS–Sterna constellation are assessed by computing forecast errors, fractions skill scores, and moist global energy norms, and comparing these with the results of a baseline experiment without the EPS–Sterna constellation. Significant and positive improvements of the forecasts are found up to 96 h, for every variable tested, with an impact increasing with the number of satellites.
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来源期刊
CiteScore
16.80
自引率
4.50%
发文量
163
审稿时长
3-8 weeks
期刊介绍: The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.
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