Quasi-equilibrium Tropical Circulation model
Quasi-equilibrium Tropical Circulation models
(QTCMs)
Introduction
Quasi-equilibrium Tropical Circulation Models (QTCMs) are part of the research effort of the
Climate Systems Interaction (CSI)
group, in the
Dept. of Atmospheric Sciences
at UCLA.
QTCMs are models of intermediate complexity suitable for the modeling
of tropical climate and its variability. It occupies a
niche among climate models between complex general circulation models
and simple models.
The primitive-equation-based dynamical framework
is constructed using analytical solutions from the quasi-equilibrium
convective parameterization as the first basis function in a
Galerkin representation of vertical structure.
A uniqueness of the QTCM is its balanced treatment of
dynamics and physical parameterizations. It includes a
linearized longwave radiation scheme,
simple cloud prediction and shortwave radiation schemes, and the
Simple-Land (SLand)
land model.
QTCM1
QTCM1 includes a single deep convective
mode in the vertical thermodynamic structure and two components (baroclinic
and barotropic) in the vertical structure of velocity.
It is computationally light (5min on a Sun Ultra2 at 5.625x3.75 resolution)
and easy to diagnose.
QTCM1 Version 2.1 - current release
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Figure 1. Model climatology January mean precipitation for the period 1982-1998.
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Figure 2. Model simulated monthly mean precipitation on the equator through the period 1982-1998.
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Contact
For scientific questions, please contact:
David Neelin: neelin@atmos.ucla.edu, (310) 206-3734 (o)
Ning Zeng: zeng@atmos.ucla.edu, (310) 825-3439 (o)
For technical questions, please contact:
Hui Su: hui@atmos.ucla.edu, (310) 825-4432 (o)
Publications
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Neelin, J. D., and N. Zeng, 1998:
The first quasi-equilibrium tropical circulation model-formulation.
J. Atmos. Sci., (submitted):
Abstract (HTML),
Paper (gzipped PS, 1.5 Mb uncompressed).
-
Zeng, N., J. D. Neelin, and C. Chou, 1998:
The first quasi-equilibrium tropical circulation model-implementation
and simulation.
J. Atmos. Sci., (submitted):
Abstract (HTML),
Paper (gzipped PS, 18.3 Mb uncompressed).
-
Lin, J. W.-B., J. D. Neelin, and N. Zeng, 1998:
Maintenance of tropical intraseasonal variability
in an intermediate-level atmospheric model,
J. Atmos. Sci., (submitted):
Abstract (HTML),
Paper (gzipped PS, 6.2 Mb uncompressed).
-
Zeng, N., J. D. Neelin, C. Chou, J. W.-B. Lin, H. Su, 1998:
Climate and variability in the first quasi-equilibrium tropical
circulation model.
General Circulation Model Development: Past, Present, and Future,
(submitted):
Paper (gzipped tar, 5 Mb uncompressed).
PS file (gzipped, 1.3 Mb).
Figure 1. Model climatology January mean precipitation for the period 1982-1998.
Figure 2. Model simulated monthly mean precipitation on the equator through the period 1982-1998.