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

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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 … continued below

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Fu, Joshua Xiouhua; Wang, Bin & Yeh, Hsi-Chyi March 15, 2010.

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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.

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  • Journal Name: 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.

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  • Report No.: DOE-HAWAII-2134
  • Grant Number: SC0002134
  • Office of Scientific & Technical Information Report Number: 1107812
  • Archival Resource Key: ark:/67531/metadc868940

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  • March 15, 2010

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  • Sept. 16, 2016, 12:32 a.m.

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Fu, Joshua Xiouhua; Wang, Bin & Yeh, Hsi-Chyi. Respective roles of shallow convection and stratiform rainfall on the simulation of Madden-Julian Oscillation., article, March 15, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc868940/: accessed May 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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