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DLR generated Near Real Time (NRT) GOME products on behalf ESA: Formaldehyde total column (HCHO)
Entry ID: DLR_GOME_NRT_HCHO

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Summary

Abstract: Formaldehyde total column (HCHO):

The Global Ozone Monitoring Experiment (GOME) was launched on April 1995 on board ESA's second European Remote Sensing Satellite (ERS-2).
This instrument can measure a range of atmospheric trace constituents, with the emphasis on global ozone distributions. Furthermore cloud properties and intensities of ... ultraviolet radiation are retrieved. These data are crucial for monitoring the atmospheric composition and the detection of pollutants.

DLR generates the operational GOME/ERS-2 level 1 and level 2 products on behalf ESA. GOME Near Real Time (NRT) products are available three hours after sensing. The NRT service was started in 1997 by setting up the GOME Data Processor at Kiruna station. Nowadays the GOME raw data is transmitted form all ERS-2 receiving stations, including the DLR Antarctic station at O'Higgins, to the DLR for further processing.

Algorithm:
The operational HCHO total column products are generated using the algorithm GDP (GOME Data Processor) version 4.x integrated into the UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) processor for generating level 2 trace gas and cloud products.
A description of the algorithm and validation is given in the reference documents listed in the GOME-2 documentation pages.

DOAS slant column fitting:
The DOAS slant column fit of HCHO is performed in the UV wavelength range 328.5-346 nm [De Smedt et al. (2008)]. A HCHO cross-section is included in the fit, as well as the cross-sections of the interfering trace gases: ozone, NO2, BrO and OClO. Two Ring reference spectrums are included as an additive fitting parameter. The detailed DOAS settings used for GOME-2 HCHO slant columns retrieval are given in the [DLR/GOME-2/ATBD].

Reference sector correction:
To reduce the impact of fitting artifacts due to unresolved spectral interferences with ozone and BrO, an absolute normalisation is applied on a daily basis using the reference sector method. The mean HCHO slant column in the reference sector (central Pacific Ocean) is fitted by a polynomial which is subtracted to all the SCD of the day and replaced by the HCHO background taken from the tropospheric 3-D Chemistry Transport Model (CTM) IMAGES [Stavrakou et al. (2009)].

AMF and VCD determination:
The AMF is calculated with the LIDORT 3.3+ model for the 340 nm, since HCHO is an optically thin absorber in this wavelength region. The AMF depends strongly on the vertical profile shape of HCHO in the troposphere, the surface albedo and the presence of clouds. The monthly output of the IMAGESv2 CTM has been used to specify the vertical profile of HCHO distribution

Acknowledgments:
GDP 4.x for total HCHO retrieval is being developed by scientists from BIRA and DLR
• BIRA: Isabelle De Smedt, Michel Van Roozendael
• DLR: Nan Hao, Pieter.Valks, Sunil Emmadi
and is funded by EUMETSAT O3M-SAF and national contributions.

Related URL

Link: VIEW PROJECT HOME PAGE

Multimedia Sample

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Caption Description: Formaldehyde total column (HCHO)

Service Citation

Originators: DLR/DFD
Title: Product Navigation » Formaldehyde total column (HCHO)
Provider: Diego Loyola
URL: http://atmos.caf.dlr.de/gome/product_hcho.html

Service Keywords

DATA ANALYSIS AND VISUALIZATION >VISUALIZATION/IMAGE PROCESSING

Science Keywords

ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ENVIRONMENT

Platform

METOP-A >Meteorological Operational Satellite - A

Instrument

GOME-2 >Global Ozone Monitoring Experiment-2

Ancillary Keywords

Near Real Time
Formaldehyde
Formaldehyde total column
HCHO

Service Provider

DE/DLR/DFD > German Remote Sensing Data Center, Deutsches Fernerkundungsdatenzentrum (DFD),German Aerospace Center, Germany

Service Organization URL: http://www.dlr.de/caf/desktopdefault.aspx/tabid-5278/8856_read-15911/

Service Provider Personnel
Name: DIEGO LOYOLA Email: Diego.Loyola at dlr.de Contact Address: German Aerospace Center German Remote Sensing Data Center City: Oberpfaffenhofen-Wessling Province or State: Bavaria Country: Germany

Personnel

MICHAEL MORAHAN
Role: SERF AUTHOR
Phone: 301-614-5107
Fax: 301-614-5304
Email: Michael.P.Morahan at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Publications/References

De Smedt I, Müller J.-F., Stavrakou T, van der A, R., Eskes, H. and Van Roozendael, M., Twelve years of global observation of formaldehyde in the troposphere using GOME and SCIAMACHY sensors, Atmos. Chem. Phys., vol. 8, no. 16, pp. 4947-4963, 2008. http://www.atmos-chem-phys.net/8/4947/2008/acp-8-4947-2008.pdf

Stavrakou, T., Müller, J.-F., De Smedt, I., Van Roozendael, M., van der Werf, G. R., Giglio, L., and Guenther, A., Evaluating the performance of pyrogenic and biogenic emission inventories against one decade of space-based formaldehyde columns, Atmos. Chem. Phys., vol. 9, no. 20, pp. 1037-1060, 2009. http://www.atmos-chem-phys.net/9/1037/2009/acp-9-1037-2009.pdf

Creation and Review Dates

SERF Creation Date: 2010-07-19
SERF Last Revision Date: 2010-07-29

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