Scale Separation for Moisture-laden Regions in the Tropical Atmosphere
نویسندگان
چکیده
The size distribution of moist regions in the tropical atmosphere exhibits two modes of organization, one at synoptic scales and the other at planetary scales. We show the existence of these two modes in two data sets: columnintegrated precipitable water and outgoing long-wave radiation. A simple two-column model of radiation and convection in the Tropics helps interpret the presence of these two modes. The coupling between radiative effects and low-level atmospheric dynamics provides a plausible mechanism for scale selection.
منابع مشابه
Large Scale Dynamics of Precipitation Fronts in the Tropical Atmosphere: a Novel Relaxation Limit
A simplified set of equations is derived systematically below for the interaction of large scale flow fields and precipitation in the tropical atmosphere. These equations, the Tropical Climate Model, have the form of a shallow water equation and an equation for moisture coupled through a strongly nonlinear source term. This source term, the precipitation, is of relaxation type in one region of ...
متن کاملواکاوی دینامیک و ترمودینامیک شدیدترین چرخند حارّهای مؤثر بر سواحل جنوبی ایران
Climatic geography of Tropical Cyclone hazards Affective on the southern coasts of Iran The occurrence of any climatic fringes, including annual tropical storms, leave irreparable risks in its dominated areas. Understanding these events and knowledge of the time of their occurrence can be helpful in managing the unexpected incidents caused by them. Tropical cyclones are important natural turbu...
متن کاملThe Hadley Circulation as a Radiative-Convective Instability
Hadley cell simulations over a tropical ocean are reported which suggest that the emission and absorption of thermal radiation by clouds and moisture play a primary role in the dynamics of the Hadley circulation. In particular, inclusion of interactions between clouds and moisture on one hand and radiation on the other causes the tropical atmosphere to become unstable to large scale convective ...
متن کاملMultiple equilibria in a single-column model of the tropical atmosphere
[1] A single-column model run under the weak temperature gradient approximation, a parameterization of large-scale dynamics appropriate for the tropical atmosphere, is shown to have multiple stable equilibria. Under conditions permitting persistent deep convection, the model has a statistically steady state in which such convection occurs, as well as an extremely dry state in which convection d...
متن کاملCoupling of latent heat flux and the greenhouse effect by large-scale tropical /subtropical dynamics diagnosed in a set of observations and model simulations
Coupled variability of the greenhouse effect (GH) and latent heat flux (LHF) over the tropical – subtropical oceans is described, summarized and compared in observations and a coupled ocean-atmosphere general circulation model (CGCM). Coupled seasonal and interannual modes account for much of the total variability in both GH and LHF. In both observations and model, seasonal coupled variability ...
متن کامل