AT2 Product Report: Carbon Monoxide (CO)

 Status: 2nd ACCENT Workshop 31.1.-2.2.2005.

Compiled by michael.buchwitz@iup.physik.uni-bremen.de based on inputs provided by ACCENT PIs.

The purpose of this report is to give an overview about the various atmospheric CO data products available within AT-2. Below detailed information about several CO data products is given. The data products are derived from MOPITT/EOS-Terra, SCIAMACHY/ENVISAT, IMG/ADEOS and (in the near future) TES/AURA and IASI/METOP.  

CO data from Measurements Of Pollution In The Troposphere (MOPITT)

PI

James R. Drummond

Type of product

CO vertical column in [molecules/cm2], CO profile at 7 defined levels

Instrument

MOPITT on Terra.

Supplied by the Canadian Space Agency

Spatio-temporal sampling

Global – coverage of most of the globe in 3-4 days. Repeat cycle 16 days, gaps due to clouds, etc.

Spatio-temporal resolution

Horizontal: 22km x 22km at nadir

Algorithm

Maximum Likelihood

Institution

Department of Physics, University of Toronto, Toronto, CANADA

Point of contact

James R. Drummond

Main reference(s)

Over 50 papers have been published on MOPITT. The latest papers are listed at: http://www.atmosp.physics.utoronto.ca/MOPITT/home.html

Processed data

Early 2000 to March 2005 and continuing

Data access

Publicly available from the Langley Distributed Active Archive Center (DAAC). See: http://eosweb.larc.nasa.gov/PRODOCS/mopitt/table_mopitt.html

Monthly “quick-look” plots are available at:

http://www.eos.ucar.edu/mopitt/data/plots/mapsv3_mon.html

Status

Data from early 2000 to mid 2001 are considered fully validated.  Data from mid 2001 onwards (after an instrument anomaly that required a significant re-configuration of instrument and algorithms) are considered preliminary, but also appear to be reliable.  Data processing is performed under the direction of the processing team at the National Center for Atmospheric Research (NCAR) in Boulder, Colorado, USA under the direction of Dr. J.C. Gille (the US PI for MOPITT)

Future work

The current algorithm is V3. It is hoped to reprocess the data using a V4 algorithm that has some improvements in the use of “a priori” data.  This will improve the quality of the data by reducing the errors, but is not expected to make significant overall changes in the retrievals.

 

CO profiles and columns from IMG retrieved by Service d'Aeronomie/Universite Libre de BXL

PI

P.F.  Coheur, C. Clerbaux

Type of product

CO vertical profiles (ppbv) and total columns columns in

[molecules/cm2] + corresponding Averaging kernels

Instrument

IMG/ADEOS (nadir view)

Spatio-temporal sampling

Global (14 1/4 orbit per day, no swath) all observations at typically 10:30 a.m. local time.

Spatio-temporal resolution

Series of 6 successive observations (8km x 8km) every 13 s (86 km), followed by deep space observations (45 s, 300 km).

Algorithm

SA-NN and Atmosphit

Institution

Universite Libre de Bruxelles, Belgium and Service d'Aeronomie/CNRS, Paris, France

Point of contact

P.F.  Coheur, C. Clerbaux

Main reference(s)

Global carbon monoxide vertical distributions from spaceborne high-resolution FTIR nadir measurements, B. Barret, S. Turquety, D. Hurtmans, C. Clerbaux, J. Hadji-Lazaro, I. Bey, M. Auvray, and P.-F. Coheur Submitted to Atm. Chem. Phys.

Processed data

Selected periods between January and June 1997.

Data access

Please contact P.F. Coheur and C. Clerbaux

Status

Estimated accuracy: - 10-20 % in the boundary layer, decreasing to better than 10 % higher up; < 10 % on the total column

Future work

Application to the retrievals of CO profiles from IASI/MetOp and possibly TES/AURA, with coupling of SA-NN and Atmosphit.

  

CO columns from SCIAMACHY retrieved by University of Heidelberg

PI

Christian Frankenberg

Type of product

CO vertical column in [molecules/cm2]

Instrument

SCIAMACHY/ENVISAT (nadir view)

Spatio-temporal sampling

Global (full coverage every six days (neglecting clouds)),

all observations at typically 10:00 a.m. local time

Spatio-temporal resolution

Horizontal: 30x120 km2 (every 0.5 s)

Algorithm

IMAP-DOAS

Institution

Institute of Environmental Physics

University of Heidelberg INF 229

69120 Heidelberg, Germany

Point of contact

christian.frankenberg@iup.uni-heidelberg.de

Web site

http://satellite.iup.uni-heidelberg.de/

->Research->SCIAMACHY->NIR (will be updated soon)

Main reference(s)

Frankenberg, C. , Platt, U. and Wagner, T., Iterative maximum a posteriori (IMAP)-DOAS for retrieval of strongly absorbing trace gases: Model studies for CH4 and CO2 retrieval from near infrared spectra of SCIAMACHY onboard ENVISAT, Atmos. Chem. Phys. 5, 9-22, 2005

Frankenberg, C. , Platt, U. and Wagner, T., Retrieval of CO from SCIAMACHY onboard ENVISAT: detection of strongly polluted areas and seasonal patterns in global CO abundances, Atmos. Chem. Phys. Disc. 4, 8425-8438, 2004

Processed data

Year 2003 until October 2004.

Data access

Please contact: christian.frankenberg@iup.uni-heidelberg.de

Status

All consolidated and non-consolidated SCIAMACHY Level 1 orbit files that are available in Heidelberg are processed. This includes the complete year 2003 and 2004 until October. First results look very encouraging and the seasonal patterns of the CO distribution can be clearly identified. In addition to the N-S gradient, the seasonal cycle of the background CO can be seen.

Future work

Improved cloud correction algorithms, better instrumental characterisation (slit function, dark current etc.)

  

CO columns from SCIAMACHY retrieved by SRON National Institute for Space Research

PI

Annemieke Gloudemans

Type of product

CO vertical column in [molecules/cm2]

Instrument

SCIAMACHY/ENVISAT (nadir view)

Spatio-temporal sampling

Global (full coverage every six days (neglecting clouds)),

all observations at typically 10:00 a.m. local time

Spatio-temporal resolution

Horizontal: 30x120 km2 (every 0.5 s)

Algorithm

IMLM

Institution

SRON National Institute for Space Research,

Utrecht, The Netherlands

Point of contact

a.gloudemans@sron.nl

Web site

http://www.sron.nl/www/code/eos/

atmos/ch4co2co/ch4co2co.php?1=1&menuID=1120

Main reference(s)

Gloudemans, A.M.S., Schrijver, H., Kleipool, Q., et al.,

The impact of SCIAMACHY near-infrared instrument calibration on retrieved CH4 and CO total columns, Atmos. Chem. Phys., 2005, acpd, accepted.

SRef-ID: 1680-7375/acpd/2005-5-1

Processed data

January 2003 - February 2004

Data access

Please contact: a.gloudemans@sron.nl

Status

All SCIAMACHY Level 1 orbit files for the period January 2003 - February 2004 have been processed, using the the latest retrieval algorithm version (IMLM v5.5), which includes all instrument calibration corrections as provided

in the SRON Patched level 1 files. Analysis is ongoing. Part of the data set has been compared to CO total columns from the MOPITT instrument on board EOS-TERRA, ground-based FTIR measurements, and calculations from atmospheric chemistry transport models (TM3). Good agreement. Qualitative comparisons with CO products from other retrieval algorithms (e.g. WFM-DOAS and IMAP) show good agreement. Estimated accuracy: monthly-averaged data within ~15%, daily data has somewhat lower accuracy. Limitations: The present data set uses a fixed atmospheric temperature profile.

Future work

The IMLM retrieval algorithm is currently being updated with the implementation of ECMWF temperature profiles. 

Reprocessed data is expected around summer 2005, including more months of data than presently available. Small refinements of the instrument-calibration corrections used are foreseen.

 

CO columns from SCIAMACHY retrieved by University of Bremen

PI

Michael Buchwitz

Type of product

CO vertical column in [molecules/cm2]

Instrument

SCIAMACHY/ENVISAT (nadir view)

Spatio-temporal sampling

Global (full coverage every six days (neglecting clouds)), all observations at typically 10:00 a.m. local time

Spatio-temporal resolution

Horizontal: 30x120 km2 (every 0.5 s)

Algorithm

WFM-DOAS

Institution

Institute of Environmental Physics / Institute of Remote Sensing (IUP/IFE), University of Bremen, Bremen, Germany

Point of contact

Michael.Buchwitz@iup.physik.uni-bremen.de

Web site

http://www.iup.physik.uni-bremen.de/sciamachy/NIR_NADIR_WFM-DOAS/

Main reference(s)

Buchwitz, M., R. de Beek, K. Bramstedt, S. Noel, H. Bovensmann, and J. P. Burrows, Global carbon monoxide as retrieved from SCIAMACHY by WFM-DOAS, Atmos. Chem. Phys., 4, 1954-1960, 2004.

Buchwitz, M., et al., Carbon monoxide, methane and carbon dioxide retrieved from SCIAMACHY by WFM-DOAS: year 2003 initial data set, Atmos. Chem. Phys. Discuss. (accepted), 2005.

Processed data

All consolidated SCIAMACHY Level 1 orbit files of the year 2003

Data access

See web site

Status

All consolidated SCIAMACHY Level 1 orbit files of the year 2003 have been processed with the latest version of the retrieval algorithm (WFM-DOAS v0.4). Analysis is ongoing. Parts of the data have been compared with MOPITT/EOS-Terra and groundbased FTIR. Reasonable agreement. Plumes of CO, e.g., due to biomass burning, can be detected. Estimated single pixel precison: 10-20%; Estimated accuracy: 10-30% (mostly positive bias; mainly over southern hemisphere); Limitations: Its difficult to accurately fit the weak CO lines. Currently, the fit residuals are on the order of the CO lines and not yet noise limited (they have systematic artifacts). The WFM-DOAS v0.4 CO columns are scaled with a constant factor of 0.5 to compensate for an obvious systematic overestimation (e.g., compared to MOPITT) most probably related to the difficult spectral fit.

Future work

The quality of the spectral fits need to be improved; more CO lines need to be added to improve the precision (currently only four lines are used); the scaling factor needs to be avoided

  

CO columns from IASI retrieved by Service d'Aeronomie/Universite Libre de BXL

PI

C.Clerbaux, P.F. Coheur

Type of product

CO vertical column in [molecules/cm2] and CO profiles in [ppbv]

Instrument

IASI/METOP (nadir view)

Spatio-temporal sampling

Global (full coverage every 4 days (neglecting clouds)), all observations at typically 10:00 a.m. local time.

Spatio-temporal resolution

Horizontal: 25x25km (every 0.25 s)

Algorithm

SA-NN and Atmosphit

Institution

Service d'Aeronomie/CNRS, Paris, France and Universite Libre de Bruxelles, Belgium

Point of contact

C.Clerbaux, P.F. Coheur

Main reference(s)

S. Turquety, J. Hadji-Lazaro, C. Clerbaux, D. A. Hauglustaine, S. A. Clough, V. Casse, P. Schlüssel and G. Megie, Operational trace gas retrieval algorithm for the Infrared Atmospheric Sounding Interferometer, J. Geophys. Res., 109, D21301, doi:10.1029/2004JD004821, 2004.

Processed data

not yet

Data access

not yet

Status

Estimated accuracy: 10%

Future work

Coupling of the neural network and optimal estimation codes

 


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