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Abstract:

On the basis of 180 storms which took place between 2004 and 2011 over the province of Mendoza (Argentina) near to the Andes Range at southern mid-latitudes, we consider those registered in the northern and central crop areas (oases). The regions affected by these storms are currently protected by an operational hail mitigation project. Differences with previously reported storms detected in the southern oasis are highlighted. Mendoza is a semiarid region situated roughly between 32S and 37S at the east of the highest Andes top. It forms a natural laboratory where different sources of gravity waves, mainly mountain waves, occur. In this work, we analyze the effects of flow over topography generating mountain waves and favoring deep convection. The joint occurrence of storms with hail production and mountain waves is determined from mesoscale numerical simulations, radar and radiosounding data. In particular, two case studies that properly represent diverse structures observed in the region are considered in detail. A continuous wavelet transform is applied to each variable and profile to detect the main oscillation modes present. Simulated temperature profiles are validated and compared with radiosounding data. Each first radar echo, time and location are determined. The necessary energy to lift a parcel to its level of free convection is tested from the Convective Available Potential Energy and Convection Inhibition. This last parameter is compared against the mountain waves' vertical kinetic energy. The time evolution and vertical structure of vertical velocity and equivalent potential temperature suggest in both cases that the detected mountain wave amplitudes are able to provide the necessary energy to lift the air parcel and trigger convection. A simple conceptual scheme linking the dynamical factors taking place before and during storm development is proposed. © 2015 Elsevier B.V.

Registro:

Documento: Artículo
Título:The influence of topography on vertical velocity of air in relation to severe storms near the Southern Andes Mountains
Autor:de la Torre, A.; Pessano, H.; Hierro, R.; Santos, J.R.; Llamedo, P.; Alexander, P.
Filiación:Facultad de Ingeniería, Universidad Austral, Avda. J. de Garay 125, ABB Buenos Aires, C1063, Argentina
Facultad Regional San Rafael, Universidad Tecnológica Nacional, Avda. Urquiza 314, San Rafael Mendoza, M5602GCH, Argentina
Dirección de Agricultura y Contingencias Climáticas, Gobierno de Mendoza, San Martín 1850, Mendoza, M5560EWS, Argentina
Departamento de Física, FCEN Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, CPM5502JMA, Argentina
Palabras clave:Andes; Mendoza; Mountain waves; Storms; Air; Arid regions; Atmospheric turbulence; Kinetic energy; Kinetics; Landforms; Natural convection; Planetary surface analysis; Potential energy; Precipitation (meteorology); Radar; Velocity; Wavelet transforms; Andes; Continuous Wavelet Transform; Convection inhibitions; Convective available potential energies; Mendoza; Mountain wave; Natural laboratories; Potential temperature; Storms; atmospheric convection; gravity wave; hail; mountain; semiarid region; severe weather; storm; temperature profile; topographic effect; Andes; Argentina; Mendoza
Año:2015
Volumen:156
Página de inicio:91
Página de fin:101
DOI: http://dx.doi.org/10.1016/j.atmosres.2014.12.020
Título revista:Atmospheric Research
Título revista abreviado:Atmos. Res.
ISSN:01698095
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01698095_v156_n_p91_delaTorre

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Citas:

---------- APA ----------
de la Torre, A., Pessano, H., Hierro, R., Santos, J.R., Llamedo, P. & Alexander, P. (2015) . The influence of topography on vertical velocity of air in relation to severe storms near the Southern Andes Mountains. Atmospheric Research, 156, 91-101.
http://dx.doi.org/10.1016/j.atmosres.2014.12.020
---------- CHICAGO ----------
de la Torre, A., Pessano, H., Hierro, R., Santos, J.R., Llamedo, P., Alexander, P. "The influence of topography on vertical velocity of air in relation to severe storms near the Southern Andes Mountains" . Atmospheric Research 156 (2015) : 91-101.
http://dx.doi.org/10.1016/j.atmosres.2014.12.020
---------- MLA ----------
de la Torre, A., Pessano, H., Hierro, R., Santos, J.R., Llamedo, P., Alexander, P. "The influence of topography on vertical velocity of air in relation to severe storms near the Southern Andes Mountains" . Atmospheric Research, vol. 156, 2015, pp. 91-101.
http://dx.doi.org/10.1016/j.atmosres.2014.12.020
---------- VANCOUVER ----------
de la Torre, A., Pessano, H., Hierro, R., Santos, J.R., Llamedo, P., Alexander, P. The influence of topography on vertical velocity of air in relation to severe storms near the Southern Andes Mountains. Atmos. Res. 2015;156:91-101.
http://dx.doi.org/10.1016/j.atmosres.2014.12.020