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Abstract:

Previous studies suggest that the enhanced meridional extent of some South American low-level jet events (known as Chaco jets) is a consequence of a positive feedback between the low-level wind and strong convection that is usually observed at their exit region. To assess how this interaction takes place, a Chaco low-level jet event observed between 18 and 19 December 2002 (i.e., during the South America Low-Level Jet Experiment) and the associated mesoscale convective system that evolved at its exit region have been selected to perform numerical experiments where diabatic heating effects associated with phase changes can be quantified. This case study has also been used to analyze the diurnal oscillations related to planetary boundary layer (PBL) mechanisms in order to describe whether the observed evolution of the low-level wind can be explained either by PBL-related forcing or by the interaction with convection. The sensitivity experiments confirm that there is a positive feedback at low levels between convection and the northerly wind flow that becomes accelerated and also aids in the identification of a strong coupling between organized convection and the upper-level circulation, resulting in an increase of the upper-level jet strength downstream of the simulated precipitation area. A conceptual model of how these systems (i.e., convection, low- and upper-level jets) mutually interact is proposed, which differs from coupling mechanisms documented for the Great Plains low-level jet. © 2007 American Meteorological Society.

Registro:

Documento: Artículo
Título:Synergism between the low-level jet and organized convection at its exit region
Autor:Saulo, C.; Ruiz, J.; García Skabar, Y.
Filiación:Centro de Investigaciones del Mar y la Atmósfera, CONICET, Universidad de Buenos Aires, Pabellón II, 2do piso, 1428 Buenos Aires, Argentina
Palabras clave:Aerodynamics; Boundary layers; Flow interactions; Precipitation (meteorology); Wind; Low-level jet; Planetary boundary layer; Jets; atmospheric convection; boundary layer; convective system; diabatic process; jet; mesoscale meteorology; oscillation; synergism
Año:2007
Volumen:135
Número:4
Página de inicio:1310
Página de fin:1326
DOI: http://dx.doi.org/10.1175/MWR3317.1
Título revista:Monthly Weather Review
Título revista abreviado:Mon. Weather Rev.
ISSN:00270644
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00270644_v135_n4_p1310_Saulo

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Citas:

---------- APA ----------
Saulo, C., Ruiz, J. & García Skabar, Y. (2007) . Synergism between the low-level jet and organized convection at its exit region. Monthly Weather Review, 135(4), 1310-1326.
http://dx.doi.org/10.1175/MWR3317.1
---------- CHICAGO ----------
Saulo, C., Ruiz, J., García Skabar, Y. "Synergism between the low-level jet and organized convection at its exit region" . Monthly Weather Review 135, no. 4 (2007) : 1310-1326.
http://dx.doi.org/10.1175/MWR3317.1
---------- MLA ----------
Saulo, C., Ruiz, J., García Skabar, Y. "Synergism between the low-level jet and organized convection at its exit region" . Monthly Weather Review, vol. 135, no. 4, 2007, pp. 1310-1326.
http://dx.doi.org/10.1175/MWR3317.1
---------- VANCOUVER ----------
Saulo, C., Ruiz, J., García Skabar, Y. Synergism between the low-level jet and organized convection at its exit region. Mon. Weather Rev. 2007;135(4):1310-1326.
http://dx.doi.org/10.1175/MWR3317.1