Role of Microphysics and Convective Autoconversion for the Better Simulation of Tropical Intraseasonal Oscillations (MISO and MJO)
Journal
Journal of Advances in Modeling Earth Systems
Journal Volume
13
Journal Issue
10
Date Issued
2021
Author(s)
Abstract
The seasonal prediction of the Indian summer monsoon (ISM) and Monsoon Intraseasonal Oscillations (MISO), as well as the Madden Julian Oscillations (MJO) that strongly modulate MISO, is of much importance to the agriculture sectors of the Indian Sub-continent. This study highlights the importance of selecting proper “autoconversion” coefficients for precipitation formation in Coupled Global Climate Model's convective and microphysical schemes in simulating MISO and MJO. With a series of sensitivity experiments, we systematically examined the convective autoconversion and microphysical autoconversion coefficients in the National Centers for Environmental Prediction Coupled Forecast System version 2 (CFSv2). The mean and intraseasonal features of MISO and MJO are improved with a proper combination of autoconversion coefficients, which not only provide a better partition of cloud water and ice but also better feedback between the large-scale condensation and convective parameterization. The results demonstrate a road map for the improvement of MISO as well as MJO simulation using a coupled climate model. ? 2021 The Authors. Journal of Advances in Modeling Earth Systems published by Wiley Periodicals LLC on behalf of American Geophysical Union.
Subjects
autoconversion
CGCM
convective
microphysics
MISO
MJO
Atmospheric thermodynamics
Climate models
Forecasting
Tropics
Autoconversion
Convective
Indian summer monsoon
Intraseasonal oscillations
Madden-Julian oscillation
Microphysics
Monsoon intraseasonal oscillation
Seasonal prediction
Tropical intraseasonal oscillation
Climatology
climate feedback
cloud microphysics
cloud water
condensation
monsoon
parameterization
prediction
India
SDGs
Type
journal article