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Title: Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.

Abstract

Respective Roles of Shallow Convection and Stratiform Rainfall on the Simulation of Madden Julian Oscillation Joshua Xiouhua Fu IPRC, SOEST, University of Hawaii The IPRC/UH Hybrid-coupled GCM (HcGCM), which combined ECHAM-4 AGCM with UH intermediate ocean model, produces robust Tropical Intra-Seasonal Oscillations including the boreal-winter MJO and boreal-summer Monsoon Intra-Seasonal Oscillation. In this study, two sets of sensitivity experiments (i.e., short-term retrospective forecast of one MJO event observed during TOGA COARE and long-term free integrations) have been carried out to understand the respective roles of shallow-convection and stratiform rainfall on the simulations and predictions of the MJO. Major findings are summarized as following: Shallow-convection ahead of MJO deep convection moistens the lower-troposphere and preconditions the movement of the MJO. Present study shows that this process is very important to the eastward propagating speed of the MJO. A significant fraction of stratiform rainfall (~30%; stratiform part vs. total rainfall) is needed for ECHAM-4 to have a robust MJO. The above findings suggest that in addition to deep convection, shallow convection and stratiform rainfall needs to be well represented in conventional GCMs to ensure a robust model MJO.

Authors:
 [1];  [2];
  1. IPRC/SOEST/UH
  2. IPRC&DM/SOEST/UH
Publication Date:
Research Org.:
University of Hawaii, Honolulu, HI
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1107812
Report Number(s):
DOE-HAWAII-2134
DOE Contract Number:  
SC0002134
Resource Type:
Journal Article
Journal Name:
J. Climate
Additional Journal Information:
Conference: Fu, X.: Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation. DOE ASR science team meeting, March 15-19, 2010, Bethesda, Maryland.
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Madden-Julian Oscillation; shallow and stratiform clouds; parameterization and TWP-ICE.

Citation Formats

Fu, Joshua Xiouhua, Wang, Bin, and Yeh, Hsi-Chyi. Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.. United States: N. p., 2010. Web.
Fu, Joshua Xiouhua, Wang, Bin, & Yeh, Hsi-Chyi. Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.. United States.
Fu, Joshua Xiouhua, Wang, Bin, and Yeh, Hsi-Chyi. Mon . "Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.". United States. https://www.osti.gov/servlets/purl/1107812.
@article{osti_1107812,
title = {Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.},
author = {Fu, Joshua Xiouhua and Wang, Bin and Yeh, Hsi-Chyi},
abstractNote = {Respective Roles of Shallow Convection and Stratiform Rainfall on the Simulation of Madden Julian Oscillation Joshua Xiouhua Fu IPRC, SOEST, University of Hawaii The IPRC/UH Hybrid-coupled GCM (HcGCM), which combined ECHAM-4 AGCM with UH intermediate ocean model, produces robust Tropical Intra-Seasonal Oscillations including the boreal-winter MJO and boreal-summer Monsoon Intra-Seasonal Oscillation. In this study, two sets of sensitivity experiments (i.e., short-term retrospective forecast of one MJO event observed during TOGA COARE and long-term free integrations) have been carried out to understand the respective roles of shallow-convection and stratiform rainfall on the simulations and predictions of the MJO. Major findings are summarized as following: Shallow-convection ahead of MJO deep convection moistens the lower-troposphere and preconditions the movement of the MJO. Present study shows that this process is very important to the eastward propagating speed of the MJO. A significant fraction of stratiform rainfall (~30%; stratiform part vs. total rainfall) is needed for ECHAM-4 to have a robust MJO. The above findings suggest that in addition to deep convection, shallow convection and stratiform rainfall needs to be well represented in conventional GCMs to ensure a robust model MJO.},
doi = {},
url = {https://www.osti.gov/biblio/1107812}, journal = {J. Climate},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {3}
}