Show simple item record

contributor authorGarner, S. T.
contributor authorFrierson, D. M. W.
contributor authorHeld, I. M.
contributor authorPauluis, O.
contributor authorVallis, G. K.
date accessioned2017-06-09T16:53:42Z
date available2017-06-09T16:53:42Z
date copyright2007/06/01
date issued2007
identifier issn0022-4928
identifier otherams-76112.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218524
description abstractConvection cannot be explicitly resolved in general circulation models given their typical grid size of 50 km or larger. However, by multiplying the vertical acceleration in the equation of motion by a constant larger than unity, the horizontal scale of convection can be increased at will, without necessarily affecting the larger-scale flow. The resulting hypohydrostatic system has been recognized for some time as a way to improve numerical stability on grids that cannot well resolve nonhydrostatic gravity waves. More recent studies have explored its potential for better representing convection in relatively coarse models. The recent studies have tested the rescaling idea in the context of regional models. Here the authors present global aquaplanet simulations with a low-resolution, nonhydrostatic model free of convective parameterization, and describe the effect on the global climate of very large rescaling of the vertical acceleration. As the convection expands to resolved scales, a deepening of the troposphere, a weakening of the Hadley cell, and a moistening of the lower troposphere is found, compared to solutions in which the moist convection is essentially hydrostatic. The growth rate of convective instability is reduced and the convective life cycle is lengthened relative to synoptic phenomena. This problematic side effect is noted in earlier studies and examined further here.
publisherAmerican Meteorological Society
titleResolving Convection in a Global Hypohydrostatic Model
typeJournal Paper
journal volume64
journal issue6
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS3929.1
journal fristpage2061
journal lastpage2075
treeJournal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 006
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record