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Cloud fraction & cloud pressure

 
   
 
European Space Agency

 
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page last modified:
10 July 2017
     
For the retrieval of tropospheric trace gas columns it is essential to have information on the cloud cover conditions. Both the cloud fraction and the cloud pressure are needed as input for the trace gas retrieval algorithms. The (effective) cloud fraction and cloud pressure are derived from GOME, SCIAMACHY and GOME-2 measurements with the FRESCO cloud algorithm. The OMI cloud information is derived with the OMCLDO2 algorithm.

Latest results for GOME-2

GOME-2 (METOP-A):GOME-2 (METOP-B):

Archives

GOME-2 cloud information (FRESCO (version G2-v7, level 1 v.5/6))

      METOP-A (version G2-v7) : menu  |  2007  |  2008  |  2009  |  2010  |  2011  |  2012  |  2013  |  2014  |  2015  |  2016
      METOP-B (version G2-v7) : menu  |  2012  |  2013  |  2014  |  2015  |  2016
 

SCIAMACHY cloud information (FRESCO (version SC-v7, level 1 v.7.04))

    Cloud information (SC-v7) :
Monthly images & data (SC-v6):
menu  |  2002  |  2003  |  2004  |  2005  |  2006  |  2007  |  2008  |  2009  |  2010  |  2011  |  2012
2002-2012
 

GOME cloud information (FRESCO (version GO-v7, level 1 v.4.0x))

       Datafiles (GO-v7): 1995  |  1996  |  1997  |  1998  |  1999  |  2000  |  2001  |  2002  |  2003
2004  |  2005  |  2006  |  2007  |  2008  |  2009  |  2010  |  2011
 

OMI cloud information (OMCLDO2 (version 1.2; level-1 collection 3))

Datafiles: all years   (at NASA / GSFC)
    Cloud Fraction images: 2007  |  2008  |  2009  |  2010  |  2011  |  2012  |  2013  |  2014  |  2015  |  2016

OMI cloud information (OMCLDO2 (version 2.0; level-1 collection 3))

Using the updated algorithm described by Veefkind et al., 2016 (see below):

data files for 2004/10 - 2017/05 (v2.0.0.10, June 2017; temporary release via TEMIS)

 

Citation

When the data is used in scientific publications, please refer to the following publication:

For FRESCO (GOME,SCIAMACHY,GOME-2) data:
* P. Wang, P. Stammes, R. van der A, G. Pinardi, M. van Roozendael (2008), FRESCO+: an improved O2 A-band cloud retrieval algorithm for tropospheric trace gas retrievals, Atmospheric Chemistry and Physics, 8, 6565-6576

For OMI data:
* Acarreta, J.R., J.F. de Haan and P. Stammes, Cloud pressure retrieval using the O2-O2 absorption band at 477 nm, J. Geophys. Res., 2004, 109, doi:10.1029/2003JD003915.
* Veefkind, J.P., J.F. de Haan, M. Sneep and P. Levelt, Improvements of the OMI O2-O2 operational cloud algorithm and comparisons with ground-based radar-lidar observations, Atmos. Meas. Tech. Disc., 2016, doi:10.5194/amt-2016-48.


Acknowledgement

The FRESCO data products of GOME-2 were generated using level 1 data developed by EUMETSAT.
 

Documentation

Scientific papers

  • Wang, P. and Stammes, P.: Evaluation of SCIAMACHY Oxygen A band cloud heights using Cloudnet measurements, Atmos. Meas. Tech., 7, 1331-1350, doi:10.5194/amt-7-1331-2014, 2014. link
  • Wang, P., Tuinder, O. N. E., Tilstra, L. G., de Graaf, M., and Stammes, P.: Interpretation of FRESCO cloud retrievals in case of absorbing aerosol events, Atmos. Chem. Phys., 12, 9057-9077, doi:10.5194/acp-12-9057-2012, 2012. link
  • Wang, P., Stammes, P., and Mueller, R., Surface solar irradiance from SCIAMACHY measurements: algorithm and validation, Atmos. Meas. Tech., 4, 875-891, doi:10.5194/amt-4-875-2011, 2011. (html-link)
  • Wang,P., P. Stammes, R. van der A, G. Pinardi, M. van Roozendael (2008), FRESCO+: an improved O2 A-band cloud retrieval algorithm for tropospheric trace gas retrievals, Atmospheric Chemistry and Physics, 8, 6565-6576 (html-link)
  • Fournier,N., P. Stammes, M. de Graaf, R. van der A, A. Piters, M. Grzegorski, A. Kokhanovsky, Improving cloud information over deserts from SCIAMACHY Oxygen A-band measurements, ACP, p163-172, SRef-ID: 1680-7324/acp/2006-6-163
  • Wang,P., P. Stammes, N. Fournier, Test and first validation of FRESCO+, Proceedings of SPIE volume 6362, Remote Sensing 2006, 11-16 Sep. 2006, Stockholm, Sweden (PDF)
  • Fournier,N., P. Stammes, J.R. Acarreta, H. Eskes, A. Piters,M. Hess, A. von Bargen, A. Kokhanovsky, and M. Grzegorski,"SCIAMACHY cloud product validation", In: Envisat Validation Workshop Proceedings (ACVE-2), ESA Special Publication SP-562, May 3-7, 2004, Frascati, Italy. (PDF)
  • Koelemeijer, R. B. A., P. Stammes, J. W. Hovenier, and J. F. de Haan, "Global distributions of effective cloud fraction and cloud top pressure derived from oxygen A band spectra measured by the Global Ozone Monitoring Experiment: comparison to ISCCP data," J. Geophys. Res. 107, doi 10.1029/2001JD000840, 2002. (PDF)
  • Koelemeijer, R. B. A., P. Stammes, J. W. Hovenier, and J. F. de Haan, "A fast method for retrieval of cloud parameters using oxygen A band measurements from the Global Ozone Monitoring Experiment", J. Geophys. Res. 106, 3475-3490, 2001. (PDF)