The Geospatial Service Infrastructure for DLR's National Remote Sensing Data Library

Heinen, Torsten; Kiemle, Stephan; Buckl, Bernhard; Mikusch, Eberhard

doi:10.1109/jstars.2009.2037598

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…These can be ordered via the EUMETSAT product navigator (http://navigator.eumetsat.int) or DLR EOWEB systems (http://eoweb.dlr.de). The German National Remote Sensing Data Library [ Heinen et al , 2009] stores the GOME‐2 SO 2 data for enabling long‐term monitoring and data reprocessing. Imagery of SO 2 , other trace gases and cloud properties derived from GOME‐2 are freely available at http://atmos.caf.dlr.de/gome2.…”

Section: Operational So2 and Bro Retrieval From Gome‐2 Measurementsmentioning

confidence: 99%

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

et al. 2012

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[1] The eruption of the Eyjafjallajökull volcano, Iceland, in April and May 2010 caused unprecedented disruptions of European air traffic showing that timely monitoring of volcanic ash and SO 2 dispersion as well as the corresponding plume heights are important for aviation safety. This paper describes the observations of SO 2 and BrO columns in the eruption plume and the determination of the SO 2 plume height using the GOME-2 satellite instrument. During the eruptive period in May 2010, SO 2 total columns of up to $20 DU and BrO columns of $7.7 Â 10 13 molec/cm 2 were detected. The BrO/SO 2 ratio estimated from the GOME-2 observations of the Eyjafjallajökull eruption varies from 1.1 Â 10 À4 to 2.1 Â 10 À4. The SO 2 plume heights estimated from the GOME-2 observations on 5 May range from 8-13 km and mostly agree within 1-3 km with visual observations, radar data and modeling results. Furthermore, the GOME-2 SO 2 observations are compared with in situ measurements of the DLR Falcon aircraft on 17 and 18 May 2010 and with Brewer instruments at Valentia, Ireland and Hohenpeissenberg, Germany. The SO 2 columns derived from the Falcon profile measurements range from 0.6-4.7 DU and the comparison with the GOME-2 measurements shows a good agreement, mainly within 1 DU. The Brewer observations at Hohenpeissenberg also agree well with the GOME-2 measurements with a daily average SO 2 column of $1.3 DU during the overpass of the SO 2 cloud on 18 May, whereas the Brewer instrument at Valentia shows up to 50% higher SO 2 columns ($8 DU) on 11 May.Citation: Rix, M., P. Valks, N. Hao, D. Loyola, H. Schlager, H. Huntrieser, J. Flemming, U. Koehler, U. Schumann, and A. Inness (2012), Volcanic SO 2 , BrO and plume height estimations using GOME-2 satellite measurements during the eruption of

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Section: Operational So2 and Bro Retrieval From Gome‐2 Measurementsmentioning

confidence: 99%

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

et al. 2012

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“…The DLR multi-mission payload ground segment system (Heinen et al, 2009) controls the reception, processing, archiving, ordering and dissemination of the GOME-2 trace gas column products. The GOME-2 level 1 PDUs are processed with the UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) system, a new generation system for the processing of operational trace gas and cloud property products in near-real time and off-line (Livschitz and Loyola, 2003;Valks et al, 2011).…”

Section: Data Transport and Processingmentioning

confidence: 99%

“…For the reference sector and spatial filtering methods, they found uncertainties of 0.2-0.45 × 10 15 molec cm −2 . To analyse the uncertainty in the GOME-2 stratospheric column, the spatial filtering method used in the GDP 4.4 has been applied to one year (2004) of reanalyses model data from the IFS-MOZART assimilation system ) as provided by the Monitoring Atmospheric Composition and Climate (MACC) project (Hollingsworth et al, 2008). To that end, synthetic slant columns for the locations of all GOME-2 measurements were derived from vertical columns given by the IFS-MOZART model on a 1.125 • × 1.125 • latitudelongitude grid and processed with the GDP 4.4 algorithm.…”

Section: Uncertainties In the Stratospheric Air Mass Factor And Stratmentioning

confidence: 99%

Operational total and tropospheric NO<sub>2</sub> column retrieval for GOME-2

et al. 2011

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Abstract. This paper presents the algorithm for the operational near real time retrieval of total and tropospheric NO 2 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 NO 2 slant columns from GOME-2 (ir)radiance data in the 425-450 nm range. Initial total NO 2 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 NO 2 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 NO 2 profiles from the MOZART-2 chemistry transport model. An error analysis shows that the random error in the GOME-2 NO 2 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 NO 2 column for polluted conditions ranges from 40 to 80 %. An end-toend ground-based validation approach for the GOME-2 NO 2 columns is illustrated based on multi-axis MAXDOAS measurements at the Observatoire de Haute Provence (OHP). The GOME-2 stratospheric NO 2 columns are found to be in Correspondence to: P. Valks (pieter.valks@dlr.de) good overall agreement with coincident ground-based measurements at OHP. A time series of the MAXDOAS and the GOME-2 tropospheric NO 2 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 .

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“…The GOME‐2 Level 1 products are received at the O3M‐SAF processing facility in DLR, Germany 1 h and 45 min after sensing. The DLR multimission payload ground segment system [ Heinen et al , 2009] controls the reception, processing, archiving, ordering and dissemination of the GOME‐2 total column and cloud products. The GOME‐2 Level 1 products are processed with the UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) system and the resulting GOME‐2 Level 2 products are disseminated through EUMETCast, WMO/GTS and the Internet.…”

Section: Introductionmentioning

confidence: 99%

The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

Loyola¹,

Koukouli²,

Valks³

et al. 2011

J. Geophys. Res.

114

144

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The Global Ozone Monitoring Instrument (GOME‐2) was launched on EUMESAT's MetOp‐A satellite in October 2006. This paper is concerned with the retrieval algorithm GOME Data Processor (GDP) version 4.4 used by the EUMETSAT Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M‐SAF) for the operational generation of GOME‐2 total ozone products. GDP 4.4 is the latest version of the GDP 4.0 algorithm, which is employed for the generation of official Level 2 total ozone and other trace gas products from GOME and SCIAMACHY. Here we focus on enhancements introduced in GDP 4.4: improved cloud retrieval algorithms including detection of Sun glint effects, a correction for intracloud ozone, better treatment of snow and ice conditions, accurate radiative transfer modeling for large viewing angles, and elimination of scan angle dependencies inherited from Level 1 radiances. Furthermore, the first global validation results for 3 years (2007–2009) of GOME‐2/MetOp‐A total ozone measurements using Brewer and Dobson measurements as references are presented. The GOME‐2/MetOp‐A total ozone data obtained with GDP 4.4 slightly underestimates ground‐based ozone by about 0.5% to 1% over the middle latitudes of the Northern Hemisphere and slightly overestimates by around 0.5% over the middle latitudes in the Southern Hemisphere. Over high latitudes in the Northern Hemisphere, GOME‐2 total ozone has almost no offset relative to Dobson readings, while over high latitudes in the Southern Hemisphere GOME‐2 exhibits a small negative bias below 1%. For tropical latitudes, GOME‐2 measures on average lower ozone by 0% to 2% compared to Dobson measurements.

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The Geospatial Service Infrastructure for DLR's National Remote Sensing Data Library

Cited by 14 publications

References 12 publications

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Operational total and tropospheric NO<sub>2</sub> column retrieval for GOME-2

The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

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The Geospatial Service Infrastructure for DLR's National Remote Sensing Data Library

Cited by 14 publications

References 12 publications

Volcanic SO2, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Volcanic SO2, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Operational total and tropospheric NO&lt;sub&gt;2&lt;/sub&gt; column retrieval for GOME-2

The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

Contact Info

Product

Resources

About

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Volcanic SO₂, BrO and plume height estimations using GOME‐2 satellite measurements during the eruption of Eyjafjallajökull in May 2010

Operational total and tropospheric NO<sub>2</sub> column retrieval for GOME-2