Open AccessProgress Towards Achieving the Challenge of Indian Summer Monsoon Climate Simulation in a Coupled Ocean‐Atmosphere Model
Author(s) -
Hazra Anupam,
Chaudhari Hemantkumar S.,
Saha Subodh Kumar,
Pokhrel Samir,
Goswami B. N.
Publication year - 2017
Publication title -
journal of advances in modeling earth systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.03
H-Index - 58
ISSN - 1942-2466
DOI - 10.1002/2017ms000966
Subject(s) - monsoon , climatology , environmental science , climate model , atmosphere (unit) , atmospheric sciences , convection , atmospheric model , east asian monsoon , cloud fraction , atmospheric convection , meteorology , monsoon of south asia , limiting , cloud computing , climate change , geology , cloud cover , troposphere , computer science , geography , mechanical engineering , oceanography , engineering , operating system
Simulation of the spatial and temporal structure of the monsoon intraseasonal oscillations (MISOs), which have effects on the seasonal mean and annual cycle of Indian summer monsoon (ISM) rainfall, remains a grand challenge for the state‐of‐the‐art global coupled models. Biases in simulation of the amplitude and northward propagation of MISOs and related dry rainfall bias over ISM region in climate models are limiting the current skill of monsoon prediction. Recent observations indicate that the convective microphysics of clouds may be critical in simulating the observed MISOs. The hypothesis is strongly supported by high fidelity in simulation of the amplitude and space‐time spectra of MISO by a coupled climate model, when our physically based modified cloud microphysics scheme is implemented in conjunction with a modified new Simple Arakawa Schubert (nSAS) convective parameterization scheme. Improved simulation of MISOs appears to have been aided by much improved simulation of the observed high cloud fraction and convective to stratiform rain fractions and resulted into a much improved simulation of the ISM rainfall, monsoon onset, and the annual cycle.