Algorithm Theoretical Basis for Version 3 TEMPO O2-O2 Cloud Product

IF 2.6 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS Earth and Space Science Pub Date : 2025-01-31 DOI:10.1029/2024EA004165

Huiqun Wang, Caroline R. Nowlan, Gonzalo González Abad, Heesung Chong, Weizhen Hou, John C. Houck, Xiong Liu, Kelly Chance, Eun-Su Yang, Alexander Vasilkov, Joanna Joiner, Wenhan Qin, Zachary Fasnacht, K. Emma Knowland, Chris Chan Miller, Robert J. D. Spurr, David E. Flittner, James L. Carr, Raid M. Suleiman, John E. Davis, Jean A. Fitzmaurice

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Abstract

This Algorithm Theoretical Basis Document (ATBD) describes the retrieval algorithm and sensitivities of the Version 3 cloud product derived from the spectra collected by the Tropospheric Emissions: Monitoring of POllution (TEMPO) instrument. The cloud product is primarily produced for supporting the retrievals of TEMPO trace gases that are important for understanding atmospheric chemistry and monitoring air pollution. The TEMPO cloud algorithm is adapted from NASA's Ozone Monitoring Instrument (OMI) oxygen collision complex (O₂-O₂) cloud algorithm. The retrieval generates effective cloud fraction (ECF) from the normalized radiance at 466 nm and generates cloud optical centroid pressure (OCP) using the O₂-O₂ column amount derived from the spectral absorption feature near 477 nm. The slant column of O₂-O₂ is retrieved using Smithsonian Astrophysical Observatory's spectral fitting code with optimized retrieval parameters. ECF and OCP are used by TEMPO trace gas retrievals to calculate Air Mass Factors which convert slant columns to vertical columns. The sensitivities of the cloud retrieval to various input parameters are investigated.

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TEMPO O2-O2云产品第三版算法理论基础

本算法理论基础文件（ATBD）描述了从对流层排放：污染监测（TEMPO）仪器收集的光谱中提取第3版云产品的检索算法和灵敏度。该云产品主要用于支持TEMPO微量气体的检索，这对于了解大气化学和监测空气污染非常重要。TEMPO云算法改编自NASA的臭氧监测仪器（OMI）氧碰撞复合体（O2-O2）云算法。利用归一化辐射在466 nm处生成有效云分数（ECF），利用光谱吸收特征在477 nm处得到的O2-O2柱量生成云光学质心压力（OCP）。利用史密森天体物理天文台的光谱拟合代码和优化的反演参数反演O2-O2斜柱。TEMPO痕量气体回收利用ECF和OCP计算空气质量因子，将斜柱转化为垂直柱。研究了云检索对不同输入参数的敏感性。

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来源期刊

Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

5.50

自引率

3.20%

发文量

285

审稿时长

19 weeks

期刊介绍： Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.