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Experimental OMPS Radiance Assimilation through One-Dimensional Variational Analysis for Total Column Ozone in the Atmosphere

1
NOAA/NESDIS Center for Satellite Applications and Research, 5830 University Research Court, College Park, MD 20740, USA
2
Earth System Science Interdisciplinary Center, Cooperative Institute for Satellite and Earth System Studies, University of Maryland, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Jose Moreno and Daniele Bortoli
Remote Sens. 2021, 13(17), 3418; https://doi.org/10.3390/rs13173418
Received: 2 June 2021 / Revised: 23 August 2021 / Accepted: 25 August 2021 / Published: 27 August 2021
(This article belongs to the Special Issue Satellite Observations on Earth’s Atmosphere)
This experiment is the first ultraviolet radiance assimilation for atmospheric ozone in the troposphere and stratosphere. The experiment has provided better understanding of which observations need to be assimilated, what bias correction scheme may be optimal, and how to obtain surface reflectance. A key element is the extension of the Community Radiative Transfer Model (CRTM) to handle fully polarized radiances, which presents challenges in terms of computational resource requirements. In this study, a scalar (unpolarized) treatment of radiances was used. The surface reflectance plays an important role in assimilating the nadir mapper (NM) radiance of the Ozone Mapping and Profiler Suite (OMPS). Most OMPS NM measurements are affected by the surface reflection of solar radiation. We propose a linear spectral reflectance model that can be determined inline by fitting two OMPS NM channel radiances at 347.6 and 371.8 nm because the two channels have near zero sensitivity on atmospheric ozone. Assimilating a transformed reflectance measurement variable, the N value can overcome the difficulty in handling the large dynamic range of radiance and normalized radiance across the spectrum of the OMPS NM. It was found that the error in bias correction, surface reflectance, and neglecting polarization in radiative transfer calculations can be largely mitigated by using the two estimated surface reflectance. This study serves as a preliminary demonstration of direct ultraviolet radiance assimilation for total column ozone in the atmosphere. View Full-Text
Keywords: OMPS nadir mapper radiance assimilation; community radiative transfer model (CRTM); retrieval algorithm; surface reflectance OMPS nadir mapper radiance assimilation; community radiative transfer model (CRTM); retrieval algorithm; surface reflectance
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MDPI and ACS Style

Liu, Q.; Cao, C.; Grassotti, C.; Liang, X.; Chen, Y. Experimental OMPS Radiance Assimilation through One-Dimensional Variational Analysis for Total Column Ozone in the Atmosphere. Remote Sens. 2021, 13, 3418. https://doi.org/10.3390/rs13173418

AMA Style

Liu Q, Cao C, Grassotti C, Liang X, Chen Y. Experimental OMPS Radiance Assimilation through One-Dimensional Variational Analysis for Total Column Ozone in the Atmosphere. Remote Sensing. 2021; 13(17):3418. https://doi.org/10.3390/rs13173418

Chicago/Turabian Style

Liu, Quanhua, Changyong Cao, Christopher Grassotti, Xingming Liang, and Yong Chen. 2021. "Experimental OMPS Radiance Assimilation through One-Dimensional Variational Analysis for Total Column Ozone in the Atmosphere" Remote Sensing 13, no. 17: 3418. https://doi.org/10.3390/rs13173418

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