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Artículo

Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula

de la Torre, AlejandroIcon ; Alexander, Pedro ManfredoIcon ; Hierro, Rodrigo FedericoIcon ; Llamedo Soria, Pablo MartinIcon ; Rolla, Alfredo LuisIcon ; Schmidt, T.; Wickert, J.
Fecha de publicación: 01/2012
Editorial: American Geophysical Union
Revista: Journal Of Geophysical Research
ISSN: 0148-0227
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente

Resumen

Above the southern Andes range and its prolongation in the Antarctic Peninsula, large-amplitude mountain and shear gravity waves observed with Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009 are analyzed. Two specific reasons motivated this study: (1) a decade of satellite observations of temperature fluctuations in the stratosphere, allowing us to infer that this region may be launching the largest-amplitude gravity waves into the upper atmosphere, and (2) the recent design of a research program to investigate these features in detail, the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. The approach selected for the regional downscaling is based on consecutive integrations with weekly reinitialization with 24 h of spin-up, and the outputs during this period are excluded from the analysis. From 1 June to 31 August 2009, five case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. In general, the estimated vertical wavelength (intrinsic period) maximizes (minimizes) around 250–300 hPa. The synoptic circulation for each case is described. Zonal and meridional components of the vertical flux of horizontal momentum are shown in detail for each case, including possible horizontal wavelengths between 12 and 400 km. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region from in situ and remote sensing measurements suggests a good agreement with the momentum flux profiles computed from the simulations. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio was always less than 1 below the lower stratosphere.
Palabras clave: Mountain Waves , Andesmountains , Peninsula Antarctica
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/17806
DOI: http://dx.doi.org/10.1029/2011JD016377
URL: http://onlinelibrary.wiley.com/doi/10.1029/2011JD016377/abstract
Colecciones
Articulos(CIMA)
Articulos de CENTRO DE INVESTIGACIONES DEL MAR Y LA ATMOSFERA
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
de la Torre, Alejandro; Alexander, Pedro Manfredo; Hierro, Rodrigo Federico; Llamedo Soria, Pablo Martin; Rolla, Alfredo Luis; et al.; Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula; American Geophysical Union; Journal Of Geophysical Research; 117; D2; 1-2012; 1-15
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