Open AccessEvaluation of a multi-level primitive equations limited area model for short range prediction over Indian region
Author(s) -
U. C. Mohanty,
R. K. Paliwal,
Ajit Tyagi,
A D St John
Publication year - 1989
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v40i1.1920
Subject(s) - climatology , tropical cyclone , monsoon , convection , meteorology , precipitation , troposphere , environmental science , vortex , boundary layer , numerical weather prediction , planetary boundary layer , range (aeronautics) , geology , atmospheric sciences , geography , mechanics , turbulence , physics , materials science , composite material
A five-level primitive equations limited area model (LAM) in flux form is considered in this study for short range prediction in the tropics. The model physics includes boundary layer, dry convective adjustment, deep cumulus convection and large scale condensation. The effect of mountains including Himalayas is incorporated through sigma coordinate formulation. An efficient split-explicit time integration scheme with time dependent lateral boundary conditions are used. This study addresses the problem of short range numerical weather prediction over Indian sub-continent during SW monsoon season. The model is integrated up to 48 hours with four typical cases representing a cut-off low, onset vortex, mid-tropospheric cyclone and monsoon depression situation during special observing period-II (MONEX) of the FGGE-1979. The model produced reasonably good forecasts of surface pressure, wind and temperature fields up to 48 hours. However, the precipitation forecasts were not very satisfactory