Retrievals of water vapour and temperature exploiting the far-infrared: application to aircraft observations in preparation for the FORUM mission

IF 3.2 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Measurement Techniques Pub Date : 2024-08-07 DOI:10.5194/egusphere-2024-2419

Sanjeevani Panditharatne, Helen Brindley, Caroline Cox, Richard Siddans, Jonathan Murray, Laura Warwick, Stuart Fox

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引用次数: 0

Abstract

Abstract. We present the extension of the RAL Infrared Microwave Sounding optimal estimation retrieval scheme to include the use of far-infrared channels in preparation for the upcoming Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) mission. The evolution and evaluation of the extended scheme is performed in two steps. First, clear-sky retrievals of temperature and water vapour are performed on IASI and FORUM simulations. Improvements of 2 % and 0.2 K are observed in the median mid to upper tropospheric retrievals of water vapour and temperature, respectively, using the FORUM configuration, with an increase of ~ 1 degree of freedom for water vapour and temperature. Secondly, radiances observed from an aircraft flight in the upper troposphere are modified to match the FORUM spectral characteristics. Retrievals from these radiances using the modified code show a strong agreement with contemporaneous in-situ measurements of the atmospheric state, reducing the RMSE by 18 % for water vapour from the a-priori, giving confidence in its performance. This tool is now readily available for use on FORUM observations and can be easily adapted to other far and mid-infrared instrument configurations.

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利用远红外线检索水蒸汽和温度：应用于飞机观测，为 FORUM 任务做准备

摘要。我们介绍了 RAL 红外微波探测最优估计检索方案的扩展，包括远红外信道的使用，为即将到来的远红外出射辐射理解和监测（FORUM）任务做准备。扩展方案的演变和评估分两步进行。首先，对 IASI 和 FORUM 模拟进行温度和水蒸气的晴空检索。使用 FORUM 配置，对流层中上层的水蒸气和温度的中值检索分别提高了 2%和 0.2 K，水蒸气和温度的自由度增加了约 1 个。其次，对飞机在对流层上部飞行时观测到的辐射进行了修改，以符合 FORUM 的光谱特征。使用修改后的代码对这些辐射进行的检索显示，与当时的大气状态现场测量结果非常吻合，水蒸气的均方根误差比先验值降低了 18%，使人们对其性能充满信心。该工具现在可随时用于 FORUM 观测，并可方便地适用于其他远红外和中红外仪器配置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Measurement Techniques METEOROLOGY & ATMOSPHERIC SCIENCES-

CiteScore

7.10

自引率

18.40%

发文量

331

审稿时长

3 months

期刊介绍： Atmospheric Measurement Techniques (AMT) is an international scientific journal dedicated to the publication and discussion of advances in remote sensing, in-situ and laboratory measurement techniques for the constituents and properties of the Earth’s atmosphere. The main subject areas comprise the development, intercomparison and validation of measurement instruments and techniques of data processing and information retrieval for gases, aerosols, and clouds. The manuscript types considered for peer-reviewed publication are research articles, review articles, and commentaries.