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contributor authorFouilloux, Anne
contributor authorIaquinta, Jean
date accessioned2017-06-09T16:12:05Z
date available2017-06-09T16:12:05Z
date copyright1998/09/01
date issued1998
identifier issn0027-0644
identifier otherams-63177.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4204151
description abstractThe influence of two initialization schemes implemented for cirrus cloud simulation with a mesoscale model (RAMS) when run at two distinct horizontal resolutions (40 and 13.5 km) is investigated. The first method combines both first guess and analyzed data issued from the European Centre for Medium-Range Weather Forecasts (ECMWF). Indeed, the former provides a good estimation of the amplitude of relative humidity, but the field is phase shifted while the latter gives a correct phase but a bad amplitude (because of the difficulty of measuring relative humidity at pressure levels lower than 400 mb). The second scheme uses information at three scale levels: ECMWF three-dimensional fields, an atmospheric vertical profile, and a cloud cover mask derived from a National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer satellite image. An interpolation algorithm that conserves the power spectrum slopes is used. Finally, several comparisons between the model outputs and observational data collected during the European Cloud and Radiation Experiment campaign are made. At a horizontal scale of 13.5 km, the authors? new assimilation procedure allows a much better characterization of the whole three-dimensional cloud field (i.e., both horizontally and vertically) in terms of optical thickness and ice water content distributions, whereas the simulations are not improved at a larger horizontal scale (40 km).
publisherAmerican Meteorological Society
titleMesoscale Cirrus Cloud Modeling and Comparisons against Experimental Data Collected on 17 April 1994 during the EUCREX Campaign
typeJournal Paper
journal volume126
journal issue9
journal titleMonthly Weather Review
identifier doi10.1175/1520-0493(1998)126<2422:MCCMAC>2.0.CO;2
journal fristpage2422
journal lastpage2434
treeMonthly Weather Review:;1998:;volume( 126 ):;issue: 009
contenttypeFulltext


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