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Quality assessment of the Ozone_cci Climate Research Data Package (release 2017): 1. Ground-based validation of total ozone column data products

Garane, Katerina and Lerot, Christophe and Coldewey-Egbers, Melanie and Verhoelst, Tijl and Zyrichidou, Irene and Balis, Dimitris and Danckaert, Thomas and Goutail, Florence and Granville, Jose and Hubert, Daan and Koukouli, MariLiza and Keppens, Arno and Lambert, Jean-Christopher and Loyola, Diego and Pommereau, Jean Pierre and Van Roozendael, Michel and Zehner, Claus (2018) Quality assessment of the Ozone_cci Climate Research Data Package (release 2017): 1. Ground-based validation of total ozone column data products. Atmospheric Measurement Techniques (AMT), 11, pp. 1385-1402. Copernicus Publications. doi: 10.5194/amt-11-1385-2018. ISSN 1867-1381.

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Official URL: https://www.atmos-meas-tech.net/11/1385/2018


The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) is a level-3 data record, which combines individual sensor products into one single cohesive record covering the 22-year period from 1995 to 2016, generated in the frame of the European Space Agency's Climate Change Initiative Phase II. It is based on level-2 total ozone data produced by the GODFIT (GOME-type Direct FITting) v4 algorithm as applied to the GOME/ERS-2, OMI/Aura, SCIAMACHY/Envisat and GOME-2/Metop-A and Metop-B observations. In this paper we examine whether GTO-ECV meets the specific requirements set by the international climate–chemistry modelling community for decadal stability long-term and short-term accuracy. In the following, we present the validation of the 2017 release of the Climate Research Data Package Total Ozone Column (CRDP TOC) at both level 2 and level 3. The inter-sensor consistency of the individual level-2 data sets has mean differences generally within 0.5 % at moderate latitudes (±50°), whereas the level-3 data sets show mean differences with respect to the OMI reference data record that span between −0.2 ± 0.9 % (for GOME-2B) and 1.0 ± 1.4 % (for SCIAMACHY). Very similar findings are reported for the level-2 validation against independent ground-based TOC observations reported by Brewer, Dobson and SAOZ instruments: the mean bias between GODFIT v4 satellite TOC and the ground instrument is well within 1.0 ± 1.0 % for all sensors, the drift per decade spans between −0.5 % and 1.0 ± 1.0 % depending on the sensor, and the peak-to-peak seasonality of the differences ranges from ∼ 1 % for GOME and OMI to  ∼ 2 % for SCIAMACHY. For the level-3 validation, our first goal was to show that the level-3 CRDP produces findings consistent with the level-2 individual sensor comparisons. We show a very good agreement with 0.5 to 2 % peak-to-peak amplitude for the monthly mean difference time series and a negligible drift per decade of the differences in the Northern Hemisphere of −0.11 ± 0.10 % decade−1 for Dobson and +0.22 ± 0.08 % decade−1 for Brewer collocations. The exceptional quality of the level-3 GTO-ECV v3 TOC record temporal stability satisfies well the requirements for the total ozone measurement decadal stability of 1–3 % and the short-term and long-term accuracy requirements of 2 and 3 %, respectively, showing a remarkable inter-sensor consistency, both in the level-2 GODFIT v4 and in the level-3 GTO-ECV v3 datasets, and thus can be used for longer-term analysis of the ozone layer, such as decadal trend studies, chemistry–climate model evaluation and data assimilation applications.

Item URL in elib:https://elib.dlr.de/119755/
Document Type:Article
Title:Quality assessment of the Ozone_cci Climate Research Data Package (release 2017): 1. Ground-based validation of total ozone column data products
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Garane, KaterinaauthUNSPECIFIED
Lerot, Christophebira-iasbUNSPECIFIED
Coldewey-Egbers, Melaniedlr-imfUNSPECIFIED
Verhoelst, Tijlbira-iasbUNSPECIFIED
Zyrichidou, IreneauthUNSPECIFIED
Balis, DimitrisauthUNSPECIFIED
Danckaert, Thomasbira-iasbUNSPECIFIED
Goutail, FlorencelatmosUNSPECIFIED
Granville, Josebira-iasbUNSPECIFIED
Hubert, Daanbira-iasbUNSPECIFIED
Koukouli, MariLizaauthUNSPECIFIED
Keppens, Arnobira-iasbUNSPECIFIED
Lambert, Jean-Christopherbira-iasbUNSPECIFIED
Loyola, DiegoDiego.Loyola (at) dlr.dehttps://orcid.org/0000-0002-8547-9350
Pommereau, Jean PierrelatmosUNSPECIFIED
Van Roozendael, Michelbira-iasbUNSPECIFIED
Zehner, Clausesa-esrinUNSPECIFIED
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-11-1385-2018
Page Range:pp. 1385-1402
Publisher:Copernicus Publications
Keywords:ozone, esa-cci, validation
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: Coldewey-Egbers, Melanie
Deposited On:27 Apr 2018 10:58
Last Modified:18 Jul 2022 14:17

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