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contributor authorKent, James
contributor authorJablonowski, Christiane
contributor authorWhitehead, Jared P.
contributor authorRood, Richard B.
date accessioned2017-06-09T17:29:28Z
date available2017-06-09T17:29:28Z
date copyright2012/05/01
date issued2012
identifier issn0027-0644
identifier otherams-86187.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4229717
description abstractodeling the transport of trace gases is an essential part of any atmospheric model. The tracer transport scheme in the Community Atmosphere Model finite-volume dynamical core (CAM-FV), which is part of the National Center for Atmospheric Research?s (NCAR?s) Community Earth System Model (CESM1), is investigated using multidimensional idealized advection tests. CAM-FV?s tracer transport algorithm makes use of one-dimensional monotonic limiters. The Colella?Sekora limiter, which is applied to increase accuracy where the data are smooth, is implemented into the CAM-FV framework, and compared with the more traditional monotonic limiter of the piecewise parabolic method (the default limiter). For 2D flow, CAM-FV splits dimensions, allowing overshoots and undershoots, with the Colella?Sekora limiter producing larger overshoots than the default limiter.The impact of vertical resolution is also explored. A vertical Lagrangian coordinate is used in CAM-FV, and is periodically remapped back to a fixed Eulerian grid. For purely vertical motion, it is found that less-frequent remapping of the Lagrangian coordinate in CAM-FV improves results. For full 3D tests, the vertical component of the tracer transport dominates the error and limits the overall accuracy. If the vertical resolution is inadequate, increasing the horizontal resolution has almost no effect on accuracy. This is because the vertical resolution currently used in CAM version 5 may not be sufficiently fine enough to resolve some atmospheric tracers and provide accurate vertical advection. Idealized tests using tracers in a gravity wave agree with these results.
publisherAmerican Meteorological Society
titleAssessing Tracer Transport Algorithms and the Impact of Vertical Resolution in a Finite-Volume Dynamical Core
typeJournal Paper
journal volume140
journal issue5
journal titleMonthly Weather Review
identifier doi10.1175/MWR-D-11-00150.1
journal fristpage1620
journal lastpage1638
treeMonthly Weather Review:;2012:;volume( 140 ):;issue: 005
contenttypeFulltext


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