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 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall7, 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)
Water vapor plays a significant role in regulating the global atmospheric circulation, especially in the troposphere. The overturning circulation is directly driven by the longwave radiative cooling of water vapor and the latent heating/cooling through microphysical processes to balance it. This global circulation is composed of diverse atmospheric phenomena with various spatial and temporal scales. Developments of some significant turbulent motions such as 3D isotropic turbulence in clouds, stratocumulus and cumulus convection, squall lines and tropical cyclones, and the Madden-Julian oscillation, are essentially associated with moisture anomaly in each scale. Moisture is accumulated relatively slowly in larger horizontal scales, but is consumed relatively quickly in smaller ones. This significant scale gaps between the accumulation and consumption may be one of the causes of the long-lasting difficulty in developing the theory of the moist atmosphere. The aim of this session is to share the recent researches about the relationships between moisture and organized cloud systems in wider spatial and temporal scales to enhance collaborations between modeling, observational, and theoretical approaches in tackling this challenging task.
[AAS02-P02] Enhancement of Madden-Julian Oscillation realization by low-frequency zonal SST gradient
*Annick Terpstra2,1, Harald Sodemann1, Irina Gorodetskaya2 (1.Geophysical Institute, University of Bergen, Norway and Bjerknes Centre for Climate Research, Bergen, Norway, 2.Center for Environment and Marine Studies, University of Aveiro, Portugal)