NDLI: Simulating the diurnal cycle of rainfall in global climate models: resolution versus parameterization

Content Provider	Springer Nature Link
Author	Dirmeyer, Paul A. Cash, Benjamin A. Kinter, James L. Jung, Thomas Marx, Lawrence Satoh, Masaki Stan, Cristiana Tomita, Hirofumi Towers, Peter Wedi, Nils Achuthavarier, Deepthi Adams, Jennifer M. Altshuler, Eric L. Huang, Bohua Jin, Emilia K. Manganello, Julia
Copyright Year	2011
Abstract	The effects of horizontal resolution and the treatment of convection on simulation of the diurnal cycle of precipitation during boreal summer are analyzed in several innovative weather and climate model integrations. The simulations include: season-long integrations of the Non-hydrostatic Icosahedral Atmospheric Model (NICAM) with explicit clouds and convection; year-long integrations of the operational Integrated Forecast System (IFS) from the European Centre for Medium-range Weather Forecasts at three resolutions (125, 39 and 16 km); seasonal simulations of the same model at 10 km resolution; and seasonal simulations of the National Center for Atmospheric Research (NCAR) low-resolution climate model with and without an embedded two-dimensional cloud-resolving model in each grid box. NICAM with explicit convection simulates best the phase of the diurnal cycle, as well as many regional features such as rainfall triggered by advancing sea breezes or high topography. However, NICAM greatly overestimates mean rainfall and the magnitude of the diurnal cycle. Introduction of an embedded cloud model within the NCAR model significantly improves global statistics of the seasonal mean and diurnal cycle of rainfall, as well as many regional features. However, errors often remain larger than for the other higher-resolution models. Increasing resolution alone has little impact on the timing of daily rainfall in IFS with parameterized convection, yet the amplitude of the diurnal cycle does improve along with the representation of mean rainfall. Variations during the day in atmospheric prognostic fields appear quite similar among models, suggesting that the distinctive treatments of model physics account for the differences in representing the diurnal cycle of precipitation.
Starting Page	399
Ending Page	418
Page Count	20
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	39
Issue Number	1-2
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Precipitation Diurnal cycle GCM Climate model Parameterization Resolution Meteorology/Climatology Geophysics/Geodesy Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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