Aerosol layer height (ALH) retrievals from oxygen absorption bands: Intercomparison and validation among different satellite platforms, GEMS, EPIC, and TROPOMI

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

Atmospheric Measurement Techniques Pub Date : 2024-01-11 DOI:10.5194/egusphere-2023-3115

Hyerim Kim, Xi Chen, Jun Wang, Zhendong Lu, Meng Zhou, Gregory Carmichael, Sang Seo Park, Jhoon Kim

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引用次数: 0

Abstract

Abstract. Although containing only single piece of information, aerosol layer height (ALH) indicates the altitude of aerosol layer in vertical coordinate which is essential for assessment of surface air quality and aerosol climate impact. Passive remote sensing measurements in oxygen (O₂) absorption bands are sensitive to ALH, providing an opportunity to derive global or regional ALH information from satellite observations. In this study, we compare ALH products retrieved from near-infrared O₂ absorption measurements from multiple satellite platforms including Geostationary Environment Monitoring Spectrometer (GEMS) focusing on Asia, Earth Polychromatic Imaging Camera (EPIC) in deep space, and polar orbiting satellite TROPOspheric Monitoring Instrument (TROPOMI), and validate them using spaceborne lidar (CALIOP) measurements for typical dust and smoke plumes. Adjustments have been made to account for the inherent variations in the definitions of ALH among different products, ensuring an apple-to-apple comparison. In comparison with CALIOP ALH, both EPIC and TROPOMI ALH display a high correlation coefficient (R) higher than 0.7 and an overestimation by ~ 0.8 km, whereas GEMS ALH exhibits minimal bias (0.1 km) but a slightly lower correlation with R of 0.64. Categorizing GEMS retrievals with UVAI ≥ 3 improves the agreement with CALIOP. GEMS ALH demonstrates a narrower range and lower mean value compared to EPIC and TROPOMI, and their correlation is further improved when UVAI ≥ 3. Furthermore, diurnal variation of GEMS and EPIC ALH, especially for UVAI ≥ 3, aligns with boundary layer development. Considering the important role of AOD in ALH retrieval, we found GEMS AOD at 680 nm correlates well with AERONET AOD (R ~ 0.9) but features a negative bias of -0.2. EPIC and TROPOMI tend to overestimate ALH by 0.33 km and 0.23 km, respectively, in dust cases. Finally, a dust and a smoke case are analysed in detail to explore the variation of ALH during plume transport from multiple data.

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从氧气吸收波段获取气溶胶层高度（ALH）：不同卫星平台、GEMS、EPIC 和 TROPOMI 之间的相互比较和验证

摘要气溶胶层高度（ALH）虽然只包含单一信息，但它表示气溶胶层在垂直坐标上的高度，对于评估地表空气质量和气溶胶对气候的影响至关重要。氧（O2）吸收波段的被动遥感测量对气溶胶层高度非常敏感，这为从卫星观测中获取全球或区域气溶胶层高度信息提供了机会。在这项研究中，我们比较了从多个卫星平台（包括聚焦亚洲的地球静止环境监测分光仪（GEMS）、深空地球多色成像相机（EPIC）和极地轨道卫星 TROPOspheric Monitoring Instrument (TROPOMI)）的近红外氧气吸收测量中获取的 ALH 产品，并利用空间激光雷达（CALIOP）测量对典型的尘烟羽流进行了验证。考虑到不同产品对 ALH 的定义存在固有差异，对其进行了调整，以确保进行苹果对苹果的比较。与 CALIOP ALH 相比，EPIC 和 TROPOMI ALH 的相关系数（R）都高于 0.7，高估了约 0.8 公里，而 GEMS ALH 的偏差最小（0.1 公里），但相关系数略低，R 为 0.64。将 UVAI ≥ 3 的 GEMS 回收数据归类，可提高与 CALIOP 的一致性。与 EPIC 和 TROPOMI 相比，GEMS ALH 的范围更窄，平均值更低，当 UVAI ≥ 3 时，它们之间的相关性进一步提高。此外，GEMS 和 EPIC ALH 的昼夜变化，尤其是 UVAI ≥ 3 时，与边界层的发展相一致。考虑到AOD在ALH检索中的重要作用，我们发现GEMS在680 nm波长的AOD与AERONET的AOD有很好的相关性（R ~ 0.9），但有-0.2的负偏差。在尘埃情况下，EPIC 和 TROPOMI 对 ALH 的估计分别高估了 0.33 公里和 0.23 公里。最后，详细分析了灰尘和烟雾的情况，以便从多个数据中探索羽流传输过程中 ALH 的变化。

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.