Exploring the role of topography and land-sea contrast on the propagation of the MJO across the Maritime Continent
Abstract
The maritime continent (MC) often works as a barrier in the propagation of intra-seasonal tropical oscillations (PISTON) that include eastward propagating Madden Julian Oscillation (MJO) and northward propagating boreal summer intra-seasonal oscillation (BSISO). This is thought to be primarily due to the topography and land-sea contrast that leads to strong diurnal cycle. To explore the dynamical mechanisms through which topography and land-sea contrast influence the PISTON by modifying the associated meso-synoptic scale features, we propose to use a series of high-resolution, cloud-system-resolving, limited-area model simulations over the MC. Our approach of understanding individual ISO cases over the MC area will be supplemented by simulations using a tropical channel model (that is global in the zonal direction, but is confined in the meridional direction) and composite analysis using observations that would provide large-scale context of the ISO events. The budget analysis of moisture, temperature, moist static energy and momentum will reveal processes that control the diurnal cycle in the MC and its interactions with the PISTON. To demonstrate the capability of our model, a series of simulations were conducted for an ISO event that occurred during the boreal spring of 2009 to explore the role of topography and land-sea contrast on that ISO event.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141613091
Entities
People
- Pallav Ray
Organizations
- Florida Institute of Technology
- Office of Naval Research
- United States Navy