A Comparison of Simulated Clouds to ISCCP Data

Meinke, Insa
June 2006
Monthly Weather Review;Jun2006, Vol. 134 Issue 6, p1669
Academic Journal
An evaluation of the cloud parameterization scheme in the High-Resolution Regional Model (HRM) of the Deutscher Wetterdienst was conducted using data from the International Satellite Cloud Climatology Project (ISCCP). Uncertainties in the model and in the measurements were first quantified. Then, criteria for comparisons of simulated and measured data were chosen in order to identify model deficiencies. The simulated clouds were subsequently classified by their parameterization so model deficiencies could be easily attributed to a certain parameterization scheme. Following this evaluation, an overestimation of simulated mean cloud amount was identified as a deficiency of the HRM. The overestimation occurred mainly during the night and was due to an overprediction of subscale clouds at low-level emissivity heights. At medium-level emissivity heights during the day, the cloud amount is underpredicted. This leads to an underestimation of the diurnal cycle. These deficiencies were connected with the relative humidity parameterization used to characterize subscale cloudiness.


Related Articles

  • Chapter 5: CLOUDINESS.  // Climate of the Arctic;2003, p97 

    The article offers information on the study related to cloud climatology in the Arctic Archipelago. In recent studies, four research about the semidarkness of the place were conducted where one of which was based on the surface observation and the remaining three were stationed on satellite...

  • Secondary organic aerosol formation in cloud droplets and aqueous particles (aqSOA): a review of laboratory, field and model studies. Ervens, B.; Turpin, B. J.; Weber, R. J. // Atmospheric Chemistry & Physics Discussions;2011, Vol. 11 Issue 8, p22301 

    Progress has been made over the past decade in predicting secondary organic aerosol (SOA) mass in the atmosphere using vapor pressure-driven partitioning, which implies that SOA compounds are formed in the gas phase and then partition to an organic phase (gasSOA). However, discrepancies in...

  • Characteristics of a persistent "pool of inhibited cloudiness" and its genesis over the Bay of Bengal associated with the Asian summer monsoon. Kumar, Anish; Nair, M.; Rajeev, K.; Sijikumar, S.; Meenu, S. // Annales Geophysicae (09927689);Jul2011, Vol. 29 Issue 7, p1247 

    Using spatial and vertical distributions of clouds derived from multi-year spaceborne observations, this paper presents the characteristics of a significant "pool of inhibited cloudiness" covering an area of >106 km² between 3-13° N and 77-90° E over the Bay of Bengal (BoB), persisting...

  • Cluster Analysis of Cloud Properties over the Southern European Mediterranean Area in Observations and a Model. Chéruy, Frédérique; Aires, Filipe // Monthly Weather Review;Oct2009, Vol. 137 Issue 10, p3161 

    This paper demonstrates how satellite observations of the cloudiness over a complex area such as the European Mediterranean area can be classified into distinct cloud regimes by application of a K-means clustering algorithm to pixel-level cloud properties. The study contrasts with previous...

  • On the Use of Probability of Clear Line of Sight Models in Parameterizing Surface Downwelling Longwave Radiation in the Tropical Western Pacific. Taylor, Patrick C.; Ellingson, Robert G. // AIP Conference Proceedings;3/11/2009, Vol. 1100 Issue 1, p502 

    Cloud parameterizations within Global Climate Models (GCMs) accounts for the largest uncertainty in current climate change predictions. One reason for this is that current methods for including sub-grid scale cloudiness invoke unrealistic assumptions about cloud field statistical properties....

  • Comparison of satellite limb-sounding humidity climatologies of the uppermost tropical troposphere. Ekström, M.; Eriksson, P.; Read, W. G.; Murtagh, D. P. // Atmospheric Chemistry & Physics Discussions;2007, Vol. 7 Issue 4, p12617 

    Humidity climatologies of the tropical uppermost troposphere from satellite limb emission measurements have been compared. Four instruments are considered; UARS-MLS, Odin-SMR, and Aura-MLS operating in the microwave region, and MIPAS in the IR region. A reference for the comparison is obtained...

  • Does the Earth Have an Adaptive Infrared Iris? Lindzen, Richard S. // Bulletin of the American Meteorological Society;Mar2001, Vol. 82 Issue 3, p417 

    Examines the humidity and cloudiness in the Tropics since the 1990s. Boundary between regions of high and low free-tropospheric relative humidity; Relationship between temperature and cirrus detrainment from cumulus convection; Plausible existence of an adaptive infrared iris controlling the...

  • Interannual variability of tropospheric composition: the influence of changes in emissions, meteorology and clouds. Voulgarakis, A.; Savage, N. H.; Wild, O.; Braesicke, P.; Young, P. J.; Carver, G. D.; Pyle, J. A. // Atmospheric Chemistry & Physics;2010, Vol. 10 Issue 5, p2491 

    We have run a chemistry transport model (CTM) to systematically examine the drivers of interannual variability of tropospheric composition during 1996-2000. This period was characterised by anomalous meteorological conditions associated with the strong El Niño of 1997-1998 and intense...

  • A semiempirical cloudiness parameterization for use in climate models. Xu, Kuan-Man; Randall, David A. // Journal of the Atmospheric Sciences;11/1/96, Vol. 53 Issue 21, p3084 

    Describes a semiempirical cloudiness parameterization for use in climate models. Use of large-scale average condensate mixing ratio as predictor; Variation of cloud amount; Validity of the semiempirical approach; Dependency of the approach on cloud regime and horizontal-averaging distance.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics