Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation.
- IPRC/SOEST/UH
- IPRC&DM/SOEST/UH
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.
- Research Organization:
- University of Hawaii, Honolulu, HI
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0002134
- OSTI ID:
- 1107812
- Report Number(s):
- DOE-HAWAII-2134
- Journal Information:
- J. Climate, 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
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