Mesoscale Convective Vortices in Multiscale, Idealized Simulations: Dependence on Background State, Interdependency with Moist Baroclinic Cyclones, and Comparison with BAMEX Observations

Conzemius, Robert J.; Montgomery, Michael T.
April 2010
Monthly Weather Review;Apr2010, Vol. 138 Issue 4, p1119
Academic Journal
A set of multiscale, nested, idealized numerical simulations of mesoscale convective systems (MCSs) and mesoscale convective vortices (MCVs) was conducted. The purpose of these simulations was to investigate the dependence of MCV development and evolution on background conditions and to explore the relationship between MCVs and larger, moist baroclinic cyclones. In all experiments, no mesoscale convective system (MCS) developed until a larger-scale, moist baroclinic system with surface pressure amplitude of at least 2 hPa was present. The convective system then enhanced the development of the moist baroclinic system by its diabatic production of eddy available potential energy (APE), which led to the enhanced baroclinic conversion of basic-state APE to eddy APE. The most rapid potential vorticity (PV) development occurred in and just behind the leading convective line. The entire system grew upscale with time as the newly created PV rotated cyclonically around a common center as the leading convective line continued to expand outward. Ten hours after the initiation of deep moist convection, the simulated MCV radii, heights of maximum winds, tangential velocity, and shear corresponded reasonably well to their counterparts in BAMEX. The increasing strength of the simulated MCVs with respect to larger values of background CAPE and shear supports the hypothesis that as long as convection is present, CAPE and shear both add to the strength of the MCV.


Related Articles

  • Mesoscale cyclones over the Black Sea. Yarovaya, D.; Efimov, V. // Russian Meteorology & Hydrology;Jun2014, Vol. 39 Issue 6, p378 

    Considered are the results of the numerical analysis of two mesoscale cyclonic vortices generated over the Black Sea near the Caucasian coast on August 3, 2007 and August 7, 2010. It is demonstrated for the axially symmetric and more long-lived vortex occurred in 2007 that the Caucasian vortices...

  • Analysis of Vortex Dynamics of Lateral Circulation in a Straight Tidal Estuary*. Li, Ming; Cheng, Peng; Chant, Robert; Valle-Levinson, Arnoldo; Arnott, Kim // Journal of Physical Oceanography;Oct2014, Vol. 44 Issue 10, p2779 

    The dynamics associated with lateral circulation in a tidally driven estuarine channel is analyzed on the basis of streamwise vorticity. Without rotational effects, differential advection and diffusive boundary mixing produce two counterrotating vortices (in the cross-channel section) whose...

  • Dynamic Instabilities of Simulated Hurricane-like Vortices and Their Impacts on the Core Structure of Hurricanes. Part II: Moist Experiments. Kwon, Young C.; Frank, William M. // Journal of the Atmospheric Sciences;Jan2008, Vol. 65 Issue 1, p106 

    The energy flows of a simulated moist hurricane-like vortex are analyzed to examine the processes that change the intensity and structure of tropical cyclones. The moist vortex used in this study is initially axisymmetric on an f plane and is placed on a uniform surface—an ocean with...

  • Loop Current and Deep Eddies. Oey, L.-Y. // Journal of Physical Oceanography;Jul2008, Vol. 38 Issue 7, p1426 

    In contrast to the Loop Current and rings, much less is known about deep eddies (deeper than 1000 m) of the Gulf of Mexico. In this paper, results from a high-resolution numerical model of the Gulf are analyzed to explain their origin and how they excite topographic Rossby waves (TRWs) that...

  • Bow Echo Mesovortices. Part II: Their Genesis. Atkins, Nolan T.; St. Laurent, Michael // Monthly Weather Review;May2009, Vol. 137 Issue 5, p1514 

    This two-part study examines the damaging potential and genesis of low-level, meso-γ-scale mesovortices formed within bow echoes. This was accomplished by analyzing quasi-idealized simulations of the 10 June 2003 Saint Louis bow echo event observed during the Bow Echo and Mesoscale Convective...

  • A Minimal Three-Dimensional Tropical Cyclone Model. Hongyang Zhu; Smith, Roger K.; Ulrich, Wolfgang // Journal of the Atmospheric Sciences;7/15/2001, Vol. 58 Issue 14 

    Describes the minimal three-dimensional numerical model for a tropical cyclone. Description of the baroclinic model; Options for treating cumulus convection on the subgrid scale; Characterization of vortex intensification; Impact of convection schemes on model results.

  • Tropical cyclogenesis in a tropical wave critical layer: easterly waves. Dunkerton, T. J.; Montgomery, M. T.; Wang, Z. // Atmospheric Chemistry & Physics;2009, Vol. 9 Issue 15, p5587 

    The development of tropical depressions within tropical waves over the Atlantic and eastern Pacific is usually preceded by a "surface low along the wave" as if to suggest a hybrid wave-vortex structure in which flow streamlines not only undulate with the waves, but form a closed circulation in...

  • Effects of Vertical Shears and Midlevel Dry Air on Tropical Cyclone Developments*. Ge, Xuyang; Li, Tim; Peng, Melinda // Journal of the Atmospheric Sciences;Dec2013, Vol. 70 Issue 12, p3859 

    A set of idealized experiments using the Weather Research and Forecasting model (WRF) were designed to investigate the impacts of a midlevel dry air layer, vertical shear, and their combined effects on tropical cyclone (TC) development. Compared with previous studies that focused on the relative...

  • Analysis of African Easterly Wave Structures and Their Role in Influencing Tropical Cyclogenesis. Hopsch, Susanna B.; Thorncroft, Chris D.; Tyle, Kevin R. // Monthly Weather Review;Apr2010, Vol. 138 Issue 4, p1399 

    Composite structures of African easterly waves (AEWs) that develop into named tropical cyclones in the Atlantic are compared and contrasted with nondeveloping AEWs using the 40-yr ECMWF Re-Analysis (ERA-40) data and satellite brightness temperature between 1979 and 2001. Developing AEWs are...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics