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Abstract:

In order to provide further insights into the relationships between the tropopause and different mandatory levels, this paper discusses the coupling between standardized tropopause height anomalies (STHAs) and standardized 500-hPa and 100-hPa height anomalies (S5HAs and S1HAs, respectively) within the 'climatic year' for three sets of upper-air stations located approximately along 20°S, 30°S and 45 °S. Data used in this research consists in a radiosonde database spanning the period 1973-2007. The mandatory levels are supposed to be included in each radiosonde profile. The tropopause, on the other hand, is calculated from the significant levels available for each sounding using the lapse rate definition. After applying a selection procedure, a basic statistical analysis combined with Fourier analysis is carried out in order to build up the standardized variables. Empirical orthogonal functions (EOFs) in S-mode are used to get the normal modes of oscillation as well as their time evolution, for STHA/S5HA as well as for STHA/S1HA coupling, separately, within the aforementioned latitudes. Overall, there are definite cycles in the time evolution associated with each EOF structure at all three latitudes, the semiannual wave playing the most important role in most of the cases. Nevertheless, 20°S seems to be the only latitude driven by diabatic heating cycles in the middle atmosphere. Certainly, EOF1 at this latitude has a semiannual behaviour and seems to be strongly influenced by the tropical convection seasonality. Apparently, the convectively driven release of latent heat in the middle troposphere affects the time evolution of the EOF1 structure. By contrast, the vertical propagation of planetary waves is raised as a possible explanation for the EOF1 and EOF2 behaviour at latitudes beyond 20°S, in view of the close connection existent between the semiannual oscillation (SAO) and the reversion in the direction of the zonal wind. © 2009 Royal Meteorological Society.

Registro:

Documento: Artículo
Título:Latitudinal height couplings between single tropopause and 500 and 100 hpa within the Southern Hemisphere
Autor:Yuchechen, A.E.; Bischoff, S.A.; Canziani, P.O.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Equipo Interdisciplinario para el Estudio de Procesos Atmosfericos en el Cambio Global (PEPACG), Pontificia Universidad Católica Argentina (UCA), Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Argentina
Palabras clave:Coupling; EOF analysis; Mandatory levels; Single tropopause; Southern hemisphere; Air stations; Diabatic heating; Empirical orthogonal function; EOF analysis; Height anomaly; Lapse rate; Middle atmosphere; Normal modes; Planetary Waves; Seasonality; Selection procedures; Semiannual oscillations; Southern Hemisphere; Statistical analysis; Time evolutions; Tropical convection; Zonal wind; Fourier analysis; Nanofluidics; Orthogonal functions; Radiosondes; Clouds; atmospheric lapse rate; convective boundary layer; coupling; database; diabatic process; Fourier transform; height; latent heat flux; latitudinal gradient; seasonality; Southern Hemisphere; time series analysis; tropopause; troposphere; zonal wind
Año:2010
Volumen:30
Número:4
Página de inicio:492
Página de fin:508
DOI: http://dx.doi.org/10.1002/joc.1914
Título revista:International Journal of Climatology
Título revista abreviado:Int. J. Climatol.
ISSN:08998418
CODEN:IJCLE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v30_n4_p492_Yuchechen

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Citas:

---------- APA ----------
Yuchechen, A.E., Bischoff, S.A. & Canziani, P.O. (2010) . Latitudinal height couplings between single tropopause and 500 and 100 hpa within the Southern Hemisphere. International Journal of Climatology, 30(4), 492-508.
http://dx.doi.org/10.1002/joc.1914
---------- CHICAGO ----------
Yuchechen, A.E., Bischoff, S.A., Canziani, P.O. "Latitudinal height couplings between single tropopause and 500 and 100 hpa within the Southern Hemisphere" . International Journal of Climatology 30, no. 4 (2010) : 492-508.
http://dx.doi.org/10.1002/joc.1914
---------- MLA ----------
Yuchechen, A.E., Bischoff, S.A., Canziani, P.O. "Latitudinal height couplings between single tropopause and 500 and 100 hpa within the Southern Hemisphere" . International Journal of Climatology, vol. 30, no. 4, 2010, pp. 492-508.
http://dx.doi.org/10.1002/joc.1914
---------- VANCOUVER ----------
Yuchechen, A.E., Bischoff, S.A., Canziani, P.O. Latitudinal height couplings between single tropopause and 500 and 100 hpa within the Southern Hemisphere. Int. J. Climatol. 2010;30(4):492-508.
http://dx.doi.org/10.1002/joc.1914