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Abstract:

Las bajas segregadas son circulaciones ciclónicas cerradas que se desarrollan en niveles altos de la tropósfera, quedando separadas del flujo de los oestes. En general se asocian a profundas caídas de la tropopausa, permitiendo intrusiones de aire estratosférico en la tropósfera, lo que puede dar lugar a diversos riesgos para la población, tales como aumentos en las concentraciones de ozono en superficie, incrementos de la inestabilidad potencial o la generación de turbulencia en aire claro. La región del Océano Pacífico al oeste de Sudamérica es una zona preferencial para el desarrollo de estos sistemas, y por tal motivo se planteó como objetivo avanzar hacia la comprensión del comportamiento de la tropopausa en bajas segregadas que afectan el sur de este continente. Se utilizó la definición dinámica de la tropopausa, basada en la discontinuidad en la vertical de la vorticidad potencial. La tropopausa se identificó con tres valores distintos de esta cantidad: -1.6, -2 y -3 PVU. Se analizaron 81 casos de bajas segregadas que se formaron al oeste de los Andes entre 1999 y 2008 y se pudo cuantificar la caída de la tropopausa dinámica en cada una de ellas. La tropopausa dinámica de las bajas segregadas estudiadas mostró caídas con valores máximos de entre 650 hPa y 550 hPa, dependiendo del valor de vorticidad potencial utilizado. Se analizó también la posición de la máxima caída de la tropopausa dinámica relativa al centro de los sistemas, encontrando una preferencia dominante por el sector ecuatorial de las bajas segregadas. © 2017, Centro Argentino de Meteorologos. Cut-off lows are closed cyclonic circulations that develop in high levels of the troposphere, separated from the westerly flow. They usually are associated with deep tropopause descent, allowing stratospheric air intrusions to the troposphere, which can lead to risks for the population, such as increments in surface ozone concentrations, increases of potential instability or generation of clear air turbulence. There is a preferential zone for the development of these systems west of South America, over the Pacific Ocean, and for this reason the goal of this paper is to progress towards understanding the behavior of the tropopause in cut-off lows that affect the south of this continent. The dynamic definition of the tropopause, based on the discontinuity in the vertical of potential vorticity was used. The tropopause was identified with three different values of this quantity: -1.6, -2 and -3 PVU. 81 cases of cut-off lows that develop west of the Andes between 1998 and 2008 were analyzed, and the tropopause drop could be quantified in each one of them. The dynamic tropopauses of the studied cut-off lows showed drops with maximum values between 650 hPa and 550 hPa, depending of the potential vorticity value selected. The position of the maximum fall, relative to the center of the systems, was also analyzed, finding a dominant preference for the equatorial sector of the cut-off lows. © 2017, Centro Argentino de Meteorologos.

Registro:

Documento: Artículo
Título:Analysis of the dynamic tropopause pressure in cut-off lows of Southern South America
Autor:Bechis, H.; Godoy, A.A.; Possia, N.E.; Campetella, C.M.
Filiación:Centro de Investigaciones del Mar y la Atmósfera, CONICET - UBA, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, FCEN - UBA, Argentina
Servicio Meteorológico Nacional, Argentina
Palabras clave:Bajas segregadas; Cut-off lows; Dynamic tropopause; Potential vorticity; Tropopausa dinámica; Vorticidad potencial
Año:2018
Volumen:43
Número:1
Página de inicio:25
Página de fin:40
Título revista:Meteorologica
Título revista abreviado:Meteorologica
ISSN:0325187X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0325187X_v43_n1_p25_Bechis

Referencias:

  • Beck, J.P., Krzyzanowski, M., Koffi, B., Hjellbrekke, A.-G., Hootsen, H., Millan, M.M., Tombrou, M., Simpson, D., Tropospheric Ozone in the European Union "The Consolidated Report" (1999) European Environment Topic Centre on Air Quality, p. 74
  • Bethan, S., Vaughan, G., Reid, S.J., A comparison of ozone and thermal tropopause heights and the impact of tropopause definition on quantifying the ozone content of the troposphere (1996) Quarterly Journal of the Royal Meteorological Society, 122 (532), pp. 929-944
  • Campetella, C.M., Possia, N.E., Upper-level cut-off lows in southern South America (2007) Meteorology and Atmospheric Physics, 96 (1-2), pp. 181-191
  • Campetella, C., Godoy, A.A., Saucedo, M., Relación entre las bajas segregadas y la precipitación en el sur de Sudamérica Actas (CD) CONGREMET X y CLIMET XIII (2009) Buenos Aires, Argentina, , Octubre de 2009 5
  • Carlson, T.N., Mid-latitude weather systems (1991) Harper Collins Academic, p. 507
  • Cox, B.D., Bithell, M., Gray, L.J., Modelling of stratospheric intrusions within a mid-latitude synoptic-scale disturbance (1997) Quarterly Journal of the Royal Meteorological Society, 123 (541), pp. 1377-1403
  • Dee, D.P., The ERA-Interim reanalysis: Configuration and performance of the data assimilation system (2011) Quarterly Journal of the Royal Meteorological Society, 137 (656), pp. 553-597
  • Fuenzalida, H.A., Sánchez, R., Garreaud, R.D., A climatology of cutoff lows in the Southern Hemisphere (2005) Journal of Geophysical Research: Atmospheres, 110
  • Godoy, A.A., Robledo, F., Campetella, C., (2010) "Cut off lows and its relations with extreme precipitation events over southern South America", , Meeting of the Americas, Foz do Iguaçu, Brasil, 8 al 12 de agosto de 2010
  • Godoy, A.A., (2013) Procesos dinámicos asociados a las bajas segregadas en el sur de Sudamérica, , Tesis de doctorado
  • Hoinka, K.P., Statistics of the global tropopause pressure (1998) Monthly Weather Review, 126 (12), pp. 3303-3325
  • Holton, J.R., An introduction to dynamic meteorology (1992) International geophysics series, p. 511. , San Diego, New York
  • Hoskins, B.J., McIntyre, M.E., Robertson, A.W., On the use and significance of isentropic potential vorticity maps (1985) Quarterly Journal of the Royal Meteorological Society, 111 (470), pp. 877-946
  • Ivanova, A.R., The tropopause: Variety of definitions and modern approaches to identification (2013) Russian Meteorology and Hydrology, 38 (12), pp. 808-817
  • Keyser, D., Shapiro, M.A., A review of the structure and dynamics of upper-level frontal zones (1986) Monthly Weather Review, 114 (2), pp. 452-499
  • Lin, M., Fiore, A.M., Cooper, O.R., Horowitz, L.W., Langford, A.O., Levy, H., Johnson, B.J., Senff, C.J., Springtime high surface ozone events over the western United States: Quantifying the role of stratospheric intrusions (2012) Journal of Geophysical Research: Atmospheres, 117
  • Morgan, M.C., Nielsen-Gammon, J.W., Using tropopause maps to diagnose midlatitude weather systems (1998) Monthly weather review, 126 (10), pp. 2555-2579
  • Nieto, R., Gimeno, L., de La Torre, L., Ribera, P., Gallego, D., García-Herrera, R., García-Herrera, R., Lorente, J., Climatological features of cutoff low systems in the Northern Hemisphere (2005) Journal of climate, 18 (16), pp. 3085-3103
  • Definition of the tropopause (1957) WMO Bull, 6, p. 136
  • (1986) Atmospheric Ozone 1985, Techn, , Rep. No. 16 (WMO, Geneva, 1986)
  • Palmén, E., Newton, C.W., (1969) Atmospheric circulation systems: their structure and physical interpretation, 603, p. 603. , New York: Academic press
  • Pinheiro, H.R., Hodges, K.I., Gan, M.A., Ferreira, N.J., A new perspective of the climatological features of upper-level cut-off lows in the Southern Hemisphere (2016) Climate Dynamics, pp. 1-19
  • Price, J.D., Vaughan, G., The potential for stratosphere-troposphere exchange in cut-off-low systems (1993) Quart. J. Roy. Meteor. Soc, 119, pp. 343-365
  • Reboita, M.S., Nieto, R., Gimeno, L., Da Rocha, R.P., Ambrizzi, T., Garreaud, R., Krüger, L.F., Climatological features of cutoff low systems in the Southern Hemisphere (2010) Journal of Geophysical Research: Atmospheres, 115
  • Reed, R.J., Sanders, F., An investigation of the development of a mid-tropospheric frontal zone and its associated vorticity field (1953) Journal of Meteorology, 10 (5), pp. 338-349
  • Reiter, E.R., Stratospheric-tropospheric exchange processes (1975) Reviews of Geophysics, 13 (4), pp. 459-474
  • Rivaben, N., (2015) Estudio preliminar de índices de turbulencia en aire claro en el sur de Sudamérica: Análisis de dos casos y validación, , Tesis de Licenciatura
  • Rondanelli, R., Gallardo, L., Garreaud, R.D., Rapid changes in ozone mixing ratios at Cerro Tololo (30o 10' S, 70o 48' W, 2200 m) in connection with cutoff lows and deep troughs (2002) Journal of Geophysical Research: Atmospheres, 107
  • Rossby, C.G., Dynamics of steady ocean currents in the light of experimental fluid mechanics (1936) Papers in Physical Oceanography and Meteorology. Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 5, pp. 1-43
  • Russell, A., Vaughan, G., Norton, E.G., Ricketts, H., Morcrette, C.J., Hewison, T.J., Browning, K.A., Blyth, A.M., Convection forced by a descending dry layer and low-level moist convergence (2009) Tellus A, 61 (2), pp. 250-263
  • Shapiro, M.A., (1982) Mesoscale weather systems of the central United States, p. 78. , Cooperative Institute for Research in environmental Sciences (CIRES), National Oceanic and Atmospheric Administration (NOAA), University of Colorado

Citas:

---------- APA ----------
Bechis, H., Godoy, A.A., Possia, N.E. & Campetella, C.M. (2018) . Analysis of the dynamic tropopause pressure in cut-off lows of Southern South America . Meteorologica, 43(1), 25-40.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0325187X_v43_n1_p25_Bechis [ ]
---------- CHICAGO ----------
Bechis, H., Godoy, A.A., Possia, N.E., Campetella, C.M. "Analysis of the dynamic tropopause pressure in cut-off lows of Southern South America " . Meteorologica 43, no. 1 (2018) : 25-40.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0325187X_v43_n1_p25_Bechis [ ]
---------- MLA ----------
Bechis, H., Godoy, A.A., Possia, N.E., Campetella, C.M. "Analysis of the dynamic tropopause pressure in cut-off lows of Southern South America " . Meteorologica, vol. 43, no. 1, 2018, pp. 25-40.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0325187X_v43_n1_p25_Bechis [ ]
---------- VANCOUVER ----------
Bechis, H., Godoy, A.A., Possia, N.E., Campetella, C.M. Analysis of the dynamic tropopause pressure in cut-off lows of Southern South America . Meteorologica. 2018;43(1):25-40.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0325187X_v43_n1_p25_Bechis [ ]