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Trends of tropical tropospheric ozone from 20 years of European satellite measurements and perspectives for the Sentinel-5 Precursor

Heue, Klaus-Peter and Coldewey-Egbers, Melanie and Delcloo, Andy and Lerot, Christophe and Loyola, Diego and Valks, Pieter and Van Roozendael, Michel (2016) Trends of tropical tropospheric ozone from 20 years of European satellite measurements and perspectives for the Sentinel-5 Precursor. Atmospheric Measurement Techniques (AMT), 9, pp. 5037-5051. Copernicus Publications. doi: 10.5194/amt-9-5037-2016. ISSN 1867-1381.

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Official URL: http://www.atmos-meas-tech.net/9/5037/2016/


In preparation of the TROPOMI/S5P launch in early 2017, a tropospheric ozone retrieval based on the convective cloud differential method was developed. For intensive tests we applied the algorithm to the total ozone columns and cloud data of the satellite instruments GOME, SCIAMACHY, OMI, GOME-2A and GOME-2B. Thereby a time series of 20 years (1995–2015) of tropospheric column ozone was generated. To have a consistent total ozone data set for all sensors, one common retrieval algorithm, namely GODFITv3, was applied and the L1 reflectances were also soft calibrated. The total ozone columns and the cloud data were input into the tropospheric ozone retrieval. However, the tropical tropospheric column ozone (TCO) for the individual instruments still showed small differences and, therefore, we harmonised the data set. For this purpose, a multilinear function was fitted to the averaged difference between SCIAMACHY's TCO and those from the other sensors. The original TCO was corrected by the fitted offset. GOME-2B data were corrected relative to the harmonised data from OMI and GOME-2A. The harmonisation leads to a better agreement between the different instruments. Also, a direct comparison of the TCO in the overlapping periods proves that GOME-2A agrees much better with SCIAMACHY after the harmonisation. The improvements for OMI were small. Based on the harmonised observations, we created a merged data product, containing the TCO from July 1995 to December 2015. A first application of this 20-year record is a trend analysis. The tropical trend is 0.7 ± 0.12 DU decade−1. Regionally the trends reach up to 1.8 DU decade−1 like on the African Atlantic coast, while over the western Pacific the tropospheric ozone declined over the last 20 years with up to 0.8 DU decade−1. The tropical tropospheric data record will be extended in the future with the TROPOMI/S5P data, where the TCO is part of the operational products.

Item URL in elib:https://elib.dlr.de/106590/
Document Type:Article
Title:Trends of tropical tropospheric ozone from 20 years of European satellite measurements and perspectives for the Sentinel-5 Precursor
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Heue, Klaus-PeterKlaus-Peter.Heue (at) dlr.dehttps://orcid.org/0000-0001-8823-7712
Coldewey-Egbers, MelanieMelanie.Coldewey-Egbers (at) dlr.deUNSPECIFIED
Delcloo, AndyRMI, Brussels, BelgienUNSPECIFIED
Loyola, DiegoDiego.Loyola (at) dlr.dehttps://orcid.org/0000-0002-8547-9350
Valks, PieterPieter.Valks (at) dlr.deUNSPECIFIED
Date:13 September 2016
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/amt-9-5037-2016
Page Range:pp. 5037-5051
EditorsEmailEditor's ORCID iD
Wagner, Thomasthomas.wagner@mpic.deUNSPECIFIED
Harder, Hartwighartwig.harder@mpic.deUNSPECIFIED
Joiner, Joannajoanna.joiner@nasa.govUNSPECIFIED
Laj, Paololaj@lgge.obs.ujf-grenoble.frUNSPECIFIED
Richter, Andreasandreas.richter@iup.physik.uni-bremen.deUNSPECIFIED
Publisher:Copernicus Publications
Keywords:S5P, troposphärisches Ozon, Long term trends
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Heue, Klaus-Peter
Deposited On:19 Oct 2016 09:54
Last Modified:19 Oct 2016 09:54

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