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contributor authorDahl, Johannes M. L.
contributor authorFischer, Jannick
date accessioned2017-06-09T17:37:17Z
date available2017-06-09T17:37:17Z
date copyright2016/10/01
date issued2016
identifier issn0882-8156
identifier otherams-88205.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231960
description abstracthe authors investigate the origin of prefrontal, warm-season convergence lines over western Europe using the Weather Research and Forecasting Model. These lines form east of the cold front in the warm sector of an extratropical cyclone, and they are frequently the focus for convective development. It is shown that these lines are related to a low-level thermal ridge that accompanies the base of an elevated mixed layer (EML) plume generated over the Iberian Peninsula and northern Africa. Using Q-vector diagnostics, including the components that describe scalar and rotational quasigeostrophic frontogenesis, it is shown that the convergence line is associated with the rearrangement of the isentropes especially at the western periphery of the EML plume. The ascending branch of the resulting ageostrophic circulation coincides with the surface velocity convergence. The modeling results are supported by a 3-yr composite analysis of cold fronts with and without preceding convergence lines using NCEP?NCAR Reanalysis-1 data.
publisherAmerican Meteorological Society
titleThe Origin of Western European Warm-Season Prefrontal Convergence Lines
typeJournal Paper
journal volume31
journal issue5
journal titleWeather and Forecasting
identifier doi10.1175/WAF-D-15-0161.1
journal fristpage1417
journal lastpage1431
treeWeather and Forecasting:;2016:;volume( 031 ):;issue: 005
contenttypeFulltext


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