Coupled ocean-atmosphere regional model simulations of diurnal Maritime Continent convection and its synergy with MJO propagation
Abstract
A coupled high-resolution regional cloud-resolving model (CRM) will be used in the Maritime Continent (MC) and Philippine Archipelago region to 1) evaluate feedbacks between the diurnal cycle and the Madden-Julian Oscillation (MJO) and boreal summer intraseasonal oscillation (BSISO), 2) identify the role of air-sea interactions and topography insuch feedbacks, and 3) evaluate the interactions between intraseasonal variability and tropical synoptic-scale disturbances and their importance to the dynamics and propagation of the MJO/BSISO. This work is motivated by the failure of most general circulation models (GCMs) to accurately represent the diurnal cycle of convection in the MC and Philippine Archipelago, as well as GCMs~ difficulty at propagating intraseasonal oscillations through the MC region. Working under the hypothesis that air-sea interactions and topography are important to MC diurnal convection, we will run and evaluate a suite of sensitivity experiments in which ocean coupling is disabled or topography altered. To understand how atmospheric and ocean processes are important to MJO/BSISO maintenance and propagation through the MC region, we will do a process-level comparison between simulated MJO/BSISO events that successfully propagate or fail to propagate through the MC region. Additional regional simulations spanning the occurrence region of tropical depression-type disturbances near the Philippines will determine the role of tropical synoptic-scale disturbances in the propagation of intraseasonal events.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141613087
Entities
People
- Eric Maloney
Organizations
- Colorado State University
- Office of Naval Research
- United States Navy