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Open AccessArticle

Inversion Models for the Retrieval of Total and Tropospheric NO2 Columns

Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Methodik der Fernerkundung (IMF), 82234 Oberpfaffenhofen, Germany
Atmosphere 2019, 10(10), 607; https://doi.org/10.3390/atmos10100607
Received: 4 September 2019 / Revised: 30 September 2019 / Accepted: 2 October 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Radiative Transfer Models of Atmospheric and Cloud Properties)
Inversion models for retrieving the total and tropospheric nitrogen dioxide ( NO 2 ) columns from spaceborne remote sensing data are presented. For total column retrieval, we propose the so-called differential radiance models with internal and external closure and solve the underlying nonlinear equations by using the method of Tikhonov regularization and the iteratively regularized Gauss–Newton method. For tropospheric column retrieval, we design a nonlinear and a linear model by using the results of the total column retrieval and the value of the stratospheric NO 2 column delivered by a stratosphere–troposphere separation method. We also analyze the fundamentals of the commonly used differential optical absorption spectroscopy (DOAS) model and outline its relationship to the proposed inversion models. By a numerical analysis, we analyze the accuracy of the inversion models to retrieve total and tropospheric NO 2 columns. View Full-Text
Keywords: inversion model; regularization; NO2 retrieval; DOAS inversion model; regularization; NO2 retrieval; DOAS
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Liu, S. Inversion Models for the Retrieval of Total and Tropospheric NO2 Columns. Atmosphere 2019, 10, 607.

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