Observed and RegCM3-Simulated Precipitation, Flood of 1993.
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RegCM3 Tutorial: Detailed example of how to run RegCM3
The first version of the RegCM
series was completed by Dickinson et al. (1989), Giorgi and Bates
(1989), and Giorgi (1990) at the National Center for Atmospheric
Research (NCAR). It was built upon the NCAR-Pennsylvania State
University (PSU) Mesoscale Model version 4 (MM4) (Anthes et al. 1987).
However, to adapt the MM4 to long-term climate simulations, the
radiative transfer package of Kiehl et al. (1987) was added along with
Biosphere-Atmosphere Transfer Scheme (BATS) version 1a (Dickinson et
al. 1986). In addition, the existing convective precipitation (Anthes
1977) and planetary boundary layer (PBL) (Deardorff 1972)
parameterizations were improved upon. The second version of the RegCM
series was developed by Giorgi et al. (1993a,b). The dynamical
core was upgraded to the hydrostatic version of the NCAR-PSU Mesoscale
Model version 5 (MM5) (Grell
et al. 1994). The radiative transfer package was also upgraded
according to that of Community Climate
Model version 2 (CCM2) (described by Briegleb (1992)). The Grell (1993)
was included as an option, and the explicit cloud and precipitation
scheme of Hsie et al. (1984) was used.
BATS was updated from version 1a to 1e (Dickinson et al. 1993) and the
non-local PBL parameterization
of Holtslag et al. (1990) was implemented. An intermediate version,
REGional Climate Model version 2.5 (RegCM2.5), was developed as
described in Giorgi and Mearns (1999). It included an option for the
Zhang and McFarlane (1995)
convection scheme, the Community Climate Model version 3 (CCM3)
radiative transfer package (Kiehl
et al. 1996), a simplified version of the Hsie et al. (1984) explicit
cloud and precipitation scheme (SIMEX)
(Giorgi and Shields 1999), and a simple interactive aerosol model
(Qian and Giorgi 1999).
RegCM3 is an integration of the main improvements that have been
made to RegCM2.5 since the description in Giorgi and Mearns (1999).
These improvements are in the representation of precipitation physics,
surface physics, atmospheric chemistry and aerosols, model input
fields, and the user interface. In addition, the dynamical code has
been modified for parallel computing. An important aspect of the RegCM3
is that it is user-friendly and operates on a variety of computer
platforms. To that end, substantial changes have been made to the
pre-processing, running, and post- processing of the model.
Furthermore, the RegCM3 has options to interface with a variety of
reanalysis and General Circulation Model (GCM) boundary conditions.