Dust Optical Centroid Height (AOCH) over bright surface: first retrieval from TROPOMI oxygen A and B absorption bands

Xi Chen; Jun Wang; Xiaoguang Xu; Meng Zhou

doi:10.1109/LGRS.2025.3601046

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Dust Optical Centroid Height (AOCH) over bright surface: first retrieval from TROPOMI oxygen A and B absorption bands

Journal article

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Dust Optical Centroid Height (AOCH) over bright surface: first retrieval from TROPOMI oxygen A and B absorption bands

Xi Chen, Jun Wang, Xiaoguang Xu and Meng Zhou

IEEE geoscience and remote sensing letters, Vol.22, 1002005

08/20/2025

DOI: 10.1109/LGRS.2025.3601046

Appears in UI Libraries Support Open Access

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Abstract

The vertical distribution of dust layers can influence dust transport, radiative forcing, deposition and ultimately, surface particulate matter mass concentration. Although many dust layer height (ALH) products from passive satellite measurements have been developed, most of them are applicable on dark surfaces only. Here, building on the absorbing aerosol optical centroid height (AOCH) retrieval from hyperspectral O 2 A and B absorption band measurements of TROPOspheric Monitoring Instrument (TROPOMI) for dark target, we further develop dust AOCH retrieval over bright surfaces. Key updates include: (a) the thresholds in cloud mask tests are refined with consideration of the different spectral characteristics of bright surface reflectance; (b) the assumption of Lambertian surface is modified to the Ross-Li Bidirectional Reflectance Distribution Function (BRDF) model to consider the angular dependence of surface reflectance. The validation against the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) for several dust plumes over Saharan Desert illustrates that TROPOMI AOCH has ~1 km uncertainty and ~0.1 km mean bias, better than ~1 km underestimated dust layer mean altitude (ALT) from the Infrared Atmospheric Sounder Interferometer (IASI). With this implement of bright surfaces, our algorithm is ready for global retrieval and will be applicable for similar hyperspectral instrument in the future.

Clouds

Surface Waves

Aerosols

AOCH

Atmospheric measurements

bright surface

dust

Land surface

MODIS

Ocean temperature

Optical surface waves

Reflectivity

Sea surface

TROPOMI

UIOWA OA Agreement

Details

Title: Subtitle: Dust Optical Centroid Height (AOCH) over bright surface: first retrieval from TROPOMI oxygen A and B absorption bands
Creators: Xi Chen - University of Iowa
Jun Wang - University of Iowa
Xiaoguang Xu - University of Maryland, Baltimore County
Meng Zhou - Goddard Space Flight Center
Resource Type: Journal article
Publication Details: IEEE geoscience and remote sensing letters, Vol.22, 1002005
DOI: 10.1109/LGRS.2025.3601046
ISSN: 1545-598X
eISSN: 1558-0571
Publisher: IEEE
Number of pages: 1
Grant note: 80NSSC20K1747; 80NSSC22K1047 / National Aeronautics and Space Administration (10.13039/100000104)
Language: English
Date published: 08/20/2025
Academic Unit: Electrical and Computer Engineering; Civil and Environmental Engineering; Iowa Technology Institute; Physics and Astronomy; Chemical and Biochemical Engineering
Record Identifier: 9984949520102771

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