Comparative analysis of the role of domain size, horizontal resolution and initial conditions in the simulation of tropical heavy rainfall events
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Comparative analysis of the role of domain size, horizontal
resolution and initial conditions in the simulation
of tropical heavy rainfall events
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| Creator |
Goswami, P
S, Himesh |
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| Subject |
Climate Modelling
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| Description |
Limited area models (LAMs) currently provide the only computationally feasible tool to simulate weather
processes at very high spatial resolution of 1–2 km. Unlike in a global circulation model (GCM), however, the limited
domains, and the associated artificial lateral boundaries, introduce additional uncertainties and errors into the simulation of
LAMs. Domain size and grid spacing (horizontal resolution) both influence the spectrum of resolved scale and the nature
of scale interaction in the model dynamics. A comparative, comprehensive and quantitative estimation of the relative role
of domain size, grid spacing and initial condition in the simulation of mesoscale events is, however, lacking. This issue
is investigated using a mesoscale model (MM5V3) with respect to three high impact weather (heavy rainfall) events in
the tropics with a series of ensemble (five initial conditions) simulations. A high-resolution (10 km) benchmark simulation
is used to establish the model’s performance in simulating heavy rainfall events which occurred over the west coast of
India during 26–27 July 2005. As the study’s emphasis is on relative roles and not on the precise forecast, sensitivity
simulations are carried out at coarser resolutions in view of the large number of simulations involved. Results show that,
along with initial conditions and grid size, the size of the domain also significantly affects simulated quantities such as
total rain and maximum rain. The results also show that domain size plays as important a role as that of grid spacing and
initial condition in the simulation of high impact weather events. Copyright 2011 Royal Meteorological Society
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| Publisher |
Wiley Online Library
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| Date |
2012-06
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/244/1/Himesh.pdf
Goswami, P and S, Himesh (2012) Comparative analysis of the role of domain size, horizontal resolution and initial conditions in the simulation of tropical heavy rainfall events. Meteorological Applications Special issue on 'Monsoons: prediction, variability and impact', 19 (2). ISSN 1469-8080 |
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| Relation |
http://onlinelibrary.wiley.com
http://cir.cmmacs.ernet.in/244/ |
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