Simulation of Dryline Misovortex Dynamics and Cumulus Formation

A dryline and misocyclones have been simulated in a cloud-resolving model by applying specified initial and time-dependent lateral boundary conditions obtained from analyses of the 22 May 2002 International H sub(2)O Project (IHOP_2002) dataset. The initial and lateral boundary conditions were obtai...

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Veröffentlicht in:Monthly weather review 2012-11, Vol.140 (11), p.3525-3551
Hauptverfasser: BUBAN, Michael S, ZIEGLER, Conrad L, MANSELL, Edward R, RICHARDSON, Yvette P
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container_end_page 3551
container_issue 11
container_start_page 3525
container_title Monthly weather review
container_volume 140
creator BUBAN, Michael S
ZIEGLER, Conrad L
MANSELL, Edward R
RICHARDSON, Yvette P
description A dryline and misocyclones have been simulated in a cloud-resolving model by applying specified initial and time-dependent lateral boundary conditions obtained from analyses of the 22 May 2002 International H sub(2)O Project (IHOP_2002) dataset. The initial and lateral boundary conditions were obtained from a combination of the time-spaced Lagrangian analyses for temperature and moisture with horizontal velocities from multiple-Doppler wind syntheses. The simulated dryline, horizontal dry-convective rolls (HCRs) and open cells (OCCs), misocyclones, and cumulus clouds are similar to the corresponding observed features. The misocyclones move northward at nearly the mean boundary layer (BL) wind speed, rotate dryline gradients owing to their circulations, and move the local dryline eastward via their passage. Cumuli develop along a secondary dryline, along HCR and OCC segments between the primary and secondary drylines, along HCR and OCC segments that have moved over the dryline, and within the dryline updraft. After the initial shearing instability develops, misocyclogenesis proceeds from tilting and stretching of vorticity by the persistent secondary dryline circulation. The resulting misocyclone evolution is discussed.
doi_str_mv 10.1175/mwr-d-11-00189.1
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source American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Atmosphere
Boundaries
Boundary conditions
Boundary layers
Circulation
Computer simulation
Earth, ocean, space
Exact sciences and technology
External geophysics
Horizontal
Instability
Meteorology
Rolls
Segments
Simulation
Studies
Vorticity
Wind speed
title Simulation of Dryline Misovortex Dynamics and Cumulus Formation
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