Simulations of Tropical Circulation and Winter Precipitation Over North India: an Application of a Tropical Band Version of Regional Climate Model (RegT-Band)

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Abstract

In the present study, simulations have been carried
out to study the relationship between winter-time precipitations and
the large-scale global forcing (ENSO) using the tropical band
version of Regional Climate Model (RegT-Band) for 5 El Nin˜o and
4 La Nin˜a years. The RegT-Band model is integrated with the
observed sea-surface temperature and lateral boundary conditions
from National Center for Environmental Prediction (NCEP)-
Department of Energy (DOE) reanalysis 2 (NCEP-DOE2). The
model domain extends from 50S to 50N and covers the entire
tropics at a grid spacing of 45 km, i.e., it includes lateral boundary
forcing only at the southern and northern boundaries. The performance
evaluation of the model in capturing the large-scale fields
followed by ENSO response with winter-time precipitation has
been carried out by using model simulations against NCEP-DOE2
and Global Precipitation Climatology Project (GPCP) precipitation
data. The analysis suggests that the model is able to reproduce the
upper airfields and large-scale precipitation during winter time,
although the model has some systematic biases compared to the
observations. A comparison of model-simulated precipitation with
observed precipitation at 17 station locations has been carried out.
It is noticed that the RegT-Band model simulations are able to
bring out the observed features reasonably well. Therefore, this
preliminary study indicates that the tropical band version of the
regional climate model can be effectively used for the better understanding
of the large-scale global forcing.
Original languageEnglish
Pages (from-to)657–674
Number of pages18
JournalPure and Applied Geophysics
Volume173
Issue number2
Early online date16 May 2015
DOIs
Publication statusPublished - 29 Feb 2016

Keywords

  • winter precipitation
  • ENSO
  • RegT-Band

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