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Theoretical and Applied Climatology

, Volume 57, Issue 3–4, pp 181–195 | Cite as

Cloud climate investigations in the Nordic region using NOAA AVHRR data

  • K. -G. Karlsson
Article

Summary

A method to estimate monthly cloud conditions (monthly cloud frequencies) from multispectral satellite imagery is described. The operational cloud classification scheme SCANDIA (the SMHI Cloud ANalysis model using DIgital AVHRR data), based on high resolution imagery from the polar orbiting NOAA-satellites, has been used to produce monthly cloud frequencies for the entire year of 1993 and some additional months in 1991, 1992, 1994 and 1995. Cloud analyses were made for an area covering the Nordic countries with a horizontal resolution of four km. Examples of seasonal, monthly and diurnal variation in cloud conditions are given and an annual mean for 1993 is presented.

Comparisons with existing surface observations showed very good agreement for horizontal cloud distributions but approximately 5% smaller cloud amounts were found in the satellite estimations. The most evident problems were encountered in the winter season due to difficulties in identifying low-level cloudiness at very low sun elevations. The underestimation in the summer season was partly fictious and caused by the overestimation of convective cloud cover by surface observers.

SCANDIA results were compared to ISCCP (International Satellite Cloud Climatology Project) cloud climatologies for two selected months in 1991 and 1992. ISCCP cloudiness was indicated to be higher, especially during the month with anticyclonic conditions where a cloudiness excess of more than 10% were found. The regional variation of cloud conditions in the area was found to be inadequately described by ISCCP cloud climatologies. An improvement of the horizontal resolution of ISCCP data seems necessary to enable use for regional applications.

The SCANDIA model is proposed as a valuable tool for local and regional monitoring of the cloud climatology at high latitudes. More extensive comparisons with ISCCP cloud climatologies are suggested as well as comparisons with modelled cloudiness from atmospheric general circulation models and climate models. Special studies of cloud conditions in the Polar areas are also proposed.

Keywords

Atmospheric General Circulation Model Cloud Amount International Satellite Cloud Climatology Project Cloud Condition AVHRR Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Arking, A., 1991: The radiative effects of clouds and their impact on climate.Bull. Amer. Meteor. Soc. 71, 795–813.Google Scholar
  2. d'Entremont, R. P., 1986: Low- and midlevel cloud analysis using nighttime multispectral imagery.J. Climate Appl. Meteor. 25, 1853–1869.Google Scholar
  3. Eyre, J. R., Brownscombe, J. L., Allam, R. J., 1984: Detection of fog at night using Advanced Very High Resolution Radiometer (AVHRR) imagery.Meteor. Mag. 113, 266–271.Google Scholar
  4. Hou, Y.-T., Campana, K. A., Mitchell, K. E., Yang, S.-K., Stowe, L. L., 1993: Comparison of an experimental NOAA AVHRR cloud dataset with other observed and forecast cloud datasets.J. Atmos. Oceanic. Technol. 10, 833–849.Google Scholar
  5. Hughes, N.A., 1984: Global cloud climatologies: A historical review.J. Climate Appl. Meteor. 23, 724–751.Google Scholar
  6. Inoue, T., 1987: Cloud type classification with NOAA-7 split window measurements.J. Geophys. Res. 4, 3991–4000.Google Scholar
  7. Karlsson, K.-G., 1989: Development of an operational cloud classification model.Int. J. Remote. Sensing 10, 687–693.Google Scholar
  8. Karlsson, K.-G., 1994: Satellite-estimated cloudiness from NOAA AVHRR data in the Nordic area during 1993.Reports Meteorology and Climatology, SMHI, 51 pp.Google Scholar
  9. Karlsson, K.-G., 1995: Estimation of cloudiness at high latitudes from multispectral satellite measurements.AMBIO 24, 33–40.Google Scholar
  10. Karlsson, K.-G., 1996a: Cloud classifications with the SCANDIA model.Reports Meteorology and Climatology, SMHI, 36 pp.Google Scholar
  11. Karlsson, K.-G., 1996b: Validation of modelled cloudiness using satellite-estimated cloud climatologies.Tellus 48A5 (containing papers from the First Study Conference on BALTEX, Visby, Sweden, 28 Aug.-1 Sep. 1995) 767–785.Google Scholar
  12. Karlsson, K.-G., Liljas, E., 1990: The SMHI model for cloud and precipitation analysis from multispectral AVHRR data.PROMIS Report 10, SMHI, 74 pp.Google Scholar
  13. Kidder, S. Q., Wu, H., 1984: Dramatic contrast between low clouds and snow cover in daytime 3.7 µm imagery.Mon. Wea. Rev. 112, 2345–2346.Google Scholar
  14. Lauritson, L., Nelson, G. J., Porto, F. W., 1979: Data extraction and calibration of TIROS-N/NOAA radiometers.NOAA Technical Memo NESS 107, NOAA, Washington D.C.Google Scholar
  15. Mokhov, I. I., Schlesinger, M. E., 1993: Analysis of global cloudiness. 1. Comparison of Meteor, Nimbus 7 and International Satellite Cloud Climatology Project (ISCCP) Satellite data.J. Geophys. Res. 98, 12 849–12 868.Google Scholar
  16. Ramanathan, V., Barkstrom, B. R., Harrison, E. F., 1989: Climate and the earth's radiation budget.Physics today, May 1989, 22–32.Google Scholar
  17. Rossow, W. B., Garder, L. C., Lacis, A. A., 1989: Global, seasonal cloud variations from satellite radiance measurements. Part I: Sensitivity of analysis.J. Climate 2, 419–459.Google Scholar
  18. Rossow, W. B., Garder, L. C., 1993a: Cloud detection using satellite measurements of infrared and visible radiances for ISCCP.J. Climate 6, 2341–2369.Google Scholar
  19. Rossow, W. B., Garder, L. C., 1993b: Validation of ISCCP cloud detections.J. Climate 6, 2370–2393.Google Scholar
  20. Rossow, W. B., Walker, A. W., Beuschel, D. E., Roiter, M. D., 1996: International Satellite Cloud Climatology Project (ISCCP) Documentation of New Cloud Datasets, WMO/TD-No. 737, World Meteorological Organization, 115 pp.Google Scholar
  21. Schiffer, R. A., Rossow, W. B., 1983: The International Satellite Cloud Climatology Project (ISCCP). The first project of the World Climate Research Programme.Bull. Amer. Meteor. Soc. 64, 779–784.Google Scholar

Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • K. -G. Karlsson
    • 1
  1. 1.Swedish Meteorological and Hydrological InstituteNorrköpingSweden

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