Japan Geoscience Union Meeting 2018

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[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS02] Large-scale moisture and organized cloud systems

Tue. May 22, 2018 1:45 PM - 3:15 PM 301B (3F International Conference Hall, Makuhari Messe)

convener:Hiroaki Miura(The University of Tokyo), Atsushi Hamada(Faculty of Sustainable Design, University of Toyama), Satoru Yokoi(海洋研究開発機構, 共同), Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo), Chairperson:Miura Hiroaki

2:30 PM - 2:45 PM

[AAS02-04] MJO in a Cloud-Permitting Near-Global Equatorial Aqua-Planet Model

★Invited Papers

*Marat Khairoutdinov1 (1.Stony Brook University)

Keywords:MJO, Organized convection, cloud-resolving models

The System for Atmospheric modeling (SAM) has been run at a horizontal grid spacing of 4 km and 20 km on an equatorial aqua planet with actual equatorial circumference, extending from 46o S to 46o N latitude with a fixed, uniform sea surface temperature (SST) with perpetual equinox solar radiation. The simulations have been run for as long as one year. Despite the uniform SST, a whole range of equatorially trapped disturbances, such as Kelvin waves and a strong Madden-Julian Oscillation (MJO) have developed. Homogenizing the surface fluxes, does not prevent the formation of zonal number one mode, but completely arrests its eastward propagation. In this and in other respects, the mode behaves like self-aggregation on a sphere. The results of other mechanism denial experiments, such as homoginization of radiation and eliminating WISHE, will also be discussed.