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Operational total and tropospheric NO2 column retrieval for GOME-2

Valks, Pieter and Pinardi, Gaia and Richter, Andreas and Lambert, Jean-Christopher and Hao, Nan and Loyola, Diego and Van Roozendael, Michel and Emmadi, Sunil (2011) Operational total and tropospheric NO2 column retrieval for GOME-2. Atmospheric Measurement Techniques, 4 (7), pp. 1491-1514. Copernicus Publications. doi: 10.5194/amt-4-1491-2011.

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Official URL: http://www.atmos-meas-tech.net/4/1491/2011/amt-4-1491-2011.pdf


This paper presents the algorithm for the operational near real time retrieval of total and tropospheric NO2 columns from the Global Ozone Monitoring Experiment (GOME-2). The retrieval is performed with the GOME Data Processor (GDP) version 4.4 as used by the EUMETSAT Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M-SAF). The differential optical absorption spectroscopy (DOAS) method is used to determine NO2 slant columns from GOME-2 (ir)radiance data in the 425–450 nm range. Initial total NO2 columns are computed using stratospheric air mass factors, and GOME-2 derived cloud properties are used to calculate the air mass factors for scenarios in the presence of clouds. To obtain the stratospheric NO2 component, a spatial filtering approach is used, which is shown to be an improvement on the Pacific reference sector method. Tropospheric air mass factors are computed using monthly averaged NO2 profiles from the MOZART-2 chemistry transport model. An error analysis shows that the random error in the GOME-2 NO2 slant columns is approximately 0.45 × 10^15 molec cm−2. As a result of the improved quartz diffuser plate used in the GOME-2 instrument, the systematic error in the slant columns is strongly reduced compared to GOME/ERS-2. The estimated uncertainty in the GOME-2 tropospheric NO2 column for polluted conditions ranges from 40 to 80 %. An end-to-end ground-based validation approach for the GOME-2 NO2 columns is illustrated based on multi-axis MAXDOAS measurements at the Observatoire de Haute Provence (OHP). The GOME-2 stratospheric NO2 columns are found to be in good overall agreement with coincident ground-based measurements at OHP. A time series of the MAXDOAS and the GOME-2 tropospheric NO2 columns shows that pollution episodes at OHP are well captured by GOME-2. Monthly mean tropospheric columns are in very good agreement, with differences generally within 0.5 × 10^15 molec cm−2.

Item URL in elib:https://elib.dlr.de/74780/
Document Type:Article
Title:Operational total and tropospheric NO2 column retrieval for GOME-2
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Richter, AndreasUniversity of BremenUNSPECIFIED
Lambert, Jean-ChristopherBIRA-IASBUNSPECIFIED
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/amt-4-1491-2011
Page Range:pp. 1491-1514
Publisher:Copernicus Publications
Keywords:GOME-2, NO2, satellite, air pollution
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Ozon-SAF (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Valks, Dr. Pieter
Deposited On:02 Feb 2012 09:28
Last Modified:02 May 2019 14:13

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