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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/6054

Title: Convection forced by a descending dry layer and low-level moist convergence
Authors: Russell, A
Vaughan, G
Norton, EG
Ricketts, HMA
Morcrette, CJ
Hewison, TJ
Browning, KA
Blyth, AM
Publication Date: 2009
Publisher: Wiley-Blackwell
Citation: Tellus. Series A: Dynamic Meteorology and Oceanography, 61(2): 250 - 263, Mar 2009
Abstract: A narrow line of convective showers was observed over southern England on 18 July 2005 during the Convective Storm Initiation Project (CSIP). The showers formed behind a cold front (CF), beneath two apparently descending dry layers (i.e. sloping so that they descended relative to the instruments observing them). The lowermost dry layer was associated with a tropopause fold from a depression, which formed 2 d earlier from a breaking Rossby wave, located northwest of the UK. The uppermost dry layer had fragmented from the original streamer due to rotation around the depression (This rotation was also responsible for the observations of apparent descent—ascent would otherwise be seen behind a CF). The lowermost dry layer descended over the UK and overran higher θw air beneath it, resulting in potential instability. Combined with a surface convergence line (which triggered the convection but had less impact on the convective available potential energy than the potential instability), convection was forced up to 5.5 km where the uppermost dry layer capped it. The period when convection was possible was very short, thus explaining the narrowness of the shower band. Convective Storm Initiation Project observations and model data are presented to illustrate the unique processes in this case.
Description: This is the post-print version of the Article - Copyright @ 2009 Wiley-Blackwell
Sponsorship: This work is partly funded by the Natural Environment Research Council (NERC).
URI: http://bura.brunel.ac.uk/handle/2438/6054
DOI: http://dx.doi.org/10.1111/j.1600-0870.2008.00382.x
ISSN: 0280-6495
Appears in Collections:Institute for the Environment Research Papers
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