Scale-Selective Bias Correction in a Downscaling of Global Analysis Using a Regional Model

Kanamaru, Hideki; Kanamitsu, Masao
February 2007
Monthly Weather Review;Feb2007, Vol. 135 Issue 2, p334
Academic Journal
Systematic large-scale errors are often found within the regional domain in the regional dynamical downscaling procedure. This paper proposes a method to suppress such errors using a combination of spectral tendency damping and area average correction of temperature, humidity, and surface pressure in the Regional Spectral Model. The proposed scale-selective bias-correction method reduces the time tendency of the zonal and meridional wind components for the physical scale greater than a predetermined length. In addition, the area mean perturbations of temperature and humidity are forced to zero. The surface pressure difference between the model field and the global field is adjusted from the hydrostatic equation using the mean elevation difference between the two fields and the area mean temperature. Each of these three components of the technique is necessary for the model to effectively reduce large-scale errors in the regional domain. With this method, the downscaled field becomes less dependent on the domain size. Furthermore, the downscaled precipitation compares better with observations, as do the near-surface temperature and wind fields. The scheme allows much weaker lateral boundary relaxation, although it is still an essential part of the regional model. The use of a similar scheme is recommended for any regional model in the application of dynamical downscaling of analysis for climate studies.


Related Articles

  • Conservative Split-Explicit Time Integration Methods for the Compressible Nonhydrostatic Equations. Klemp, J. B.; Skamarock, W. C.; Dudhia, J. // Monthly Weather Review;Aug2007, Vol. 135 Issue 8, p2897 

    Historically, time-split schemes for numerically integrating the nonhydrostatic compressible equations of motion have not formally conserved mass and other first-order flux quantities. In this paper, split-explicit integration techniques are developed that numerically conserve these properties...

  • A Conceptual Model of the Surface Salinity Distribution in the Oceanic Hadley Cell. Nilsson, Johan; Körnich, Heiner // Journal of Climate;Dec2008, Vol. 21 Issue 24, p6586 

    A conceptual model of the salinity distribution in the oceanic Hadley cell is presented. The model pertains to the region of tropical easterly surface winds, where the surface salinity increases poleward from a local salinity minimum near the equator to a subtropical salinity maximum. A...

  • Measurement of GCM Skill in Predicting Variables Relevant for Hydroclimatological Assessments. Johnson, Fiona; Sharma, Ashish // Journal of Climate;Aug2009, Vol. 22 Issue 16, p4373 

    Simulations from general circulation models are now being used for a variety of studies and purposes. With up to 23 different GCMs now available, it is desirable to determine whether a specific variable from a particular model is representative of the ensemble mean, which is often assumed to...

  • AN EXPLORATORY ANALYSIS OF PM10 PARTICULATE MATTER RELATIONSHIPS WITH WEATHER DATA AND SPATIAL VARIATION. Dunea, Daniel // Proceedings of the International Multidisciplinary Scientific Ge;2014, Vol. 2, p273 

    The main aim of the paper was to explore the interrelationships between PM10 time series and various weather parameters i.e. air temperature, atmospheric pressure, relative humidity, solar radiation, and wind speed, recorded hourly at six automated monitoring stations located in Oltenia...

  • Variations of Water Vapor Transports in Three Rivers' Headstream during 1971-2010. Fu Bitao; Zeng Xiaofan // Advanced Materials Research;2014, Vol. 1073-1076, p1760 

    Trend of water vapor transports in the Three Rivers' Headstream region(China) during 1971-2010 was analyzed based on the applicability analysis of the NCEP/NCAR I reanalysis data in contrast to two kind of data: the daily wind and specific humidity of the R1 data, and the radiosonde data in and...

  • Stratospheric winds: longitudinal distribution and long-term trends. Kozubek, M.; Krizan, P.; Lastovicka, J. // Atmospheric Chemistry & Physics Discussions;2014, Vol. 14 Issue 11, p16387 

    The wind is very important parameter of the stratospheric dynamics which can be affected by many factors like tropospheric North Atlantic Oscillation (NAO) or El Nino Southern Oscillation (ENSO), stratospheric Quasi-biennial Oscillation (QBO) or Sudden Stratospheric Warming (SSW) and solar...

  • The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model. Mignot, Juliette; Frankignoul, Claude // Journal of Climate;Jul2005, Vol. 18 Issue 13, p2361 

    The link between the interannual to interdecadal variability of the Atlantic meridional overturning circulation (AMOC) and the atmospheric forcing is investigated using 200 yr of a control simulation of the Bergen Climate Model, where the mean circulation cell is rather realistic, as is also the...

  • Marine Low-Cloud Anomalies Associated with ENSO. Park, Sungsu; Leovy, Conway B. // Journal of Climate;Sep2004, Vol. 17 Issue 17, p3448 

    As a contribution to understanding the possible impact of altered climate regimes on marine clouds, and hence on cloud radiative forcing, ship-observed marine low clouds and precipitation frequency for individual seasons are regressed at zero lag on an index of El Niño–Southern...

  • CONSIDERATIONS REGARDING BAIA MARE URBAN AREA WEATHER EVOLUTION. COMAN, Mirela; CIORUŢA, Bogdan; TARO, Gilbert // Proceedings of the Scientific Conference AFASES;May2012, p809 

    Human interest in meteorological domain has been manifested since ancient times, when scientists began to observe and describe the weather and have tried to explain most of the weather phenomena. Science in 2007 at North University of Baia Mare is continuously registered meteorological data with...


Read the Article


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

Try another library?
Sign out of this library

Other Topics