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contributor authorYang, Qing
contributor authorLeung, L. Ruby
contributor authorRauscher, Sara A.
contributor authorRingler, Todd D.
contributor authorTaylor, Mark A.
date accessioned2017-06-09T17:09:09Z
date available2017-06-09T17:09:09Z
date copyright2014/05/01
date issued2013
identifier issn0894-8755
identifier otherams-80203.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223070
description abstracthis study investigates the moisture budgets and resolution dependency of precipitation extremes in an aquaplanet framework based on the Community Atmosphere Model, version 4 (CAM4). Moisture budgets from simulations using two different dynamical cores, the Model for Prediction Across Scales-Atmosphere (MPAS-A) and High Order Method Modeling Environment (HOMME), but the same physics parameterizations suggest that during precipitation extremes the intensity of precipitation is approximately balanced by the vertical advective moisture transport. The resolution dependency in extremes from simulations at their native grid resolution originates from that of vertical moisture transport, which is mainly explained by changes in dynamics (related to vertical velocity ?) with resolution. When assessed at the same grid scale by area-weighted averaging the fine-resolution simulations to the coarse grids, simulations with either dynamical core still demonstrate resolution dependency in extreme precipitation with no convergence over the tropics, but convergence occurs at a wide range of latitudes over the extratropics. The use of lower temporal frequency data (i.e., daily vs 6 hourly) reduces the resolution dependency. Although thermodynamic (moisture) changes become significant in offsetting the effect of dynamics when assessed at the same grid scale, especially over the extratropics, changes in dynamics with resolution are still large and explain most of the resolution dependency during extremes. This suggests that the effects of subgrid-scale variability of ? and vertical moisture transport during extremes are not adequately parameterized by the model at coarse resolution. The aquaplanet framework and analysis described in this study provide an important metric for assessing sensitivities of cloud parameterizations to spatial resolution and dynamical cores under extreme conditions.
publisherAmerican Meteorological Society
titleAtmospheric Moisture Budget and Spatial Resolution Dependence of Precipitation Extremes in Aquaplanet Simulations
typeJournal Paper
journal volume27
journal issue10
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-13-00468.1
journal fristpage3565
journal lastpage3581
treeJournal of Climate:;2013:;volume( 027 ):;issue: 010
contenttypeFulltext


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