Open AccessSystematic errors of IMD Operational NWP model
Author(s) -
S. K. Roy Bhowmik
Publication year - 2004
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v55i1.852
Subject(s) - climatology , geopotential height , troposphere , latitude , environmental science , zonal and meridional , geopotential , thermal wind , atmospheric sciences , meteorology , wind speed , geology , geography , wind shear , precipitation , geodesy
The systematic errors of IMD (India Meteorological Department) limited area model over Indian region using 48 hours forecast fields for winter and summer seasons are examined in this paper. The study reveals that the core of the sub tropical westerly jet and tropical easterly jet are well simulated in the zonal component of wind. In case of meridional component of wind significant difference is noticed between forecast and analysis. In the upper tropospheric levels (above 100 hPa) northerly biases are noticed. Thermal structure of the model exhibits cool bias in middle and lower tropospheric levels over the northern latitudes. The nature of model biases of the geopotential height changes with the season. Model drying over the tropical belt and moistening towards the northern latitudes are found in all the seasons studied.