SciELO - Scientific Electronic Library Online

vol.27 issue1Behavior of the wind in the eastern Santa Catarina under influence of extratropical cyclonesMeteorological data mining for the prediction of severe convective events author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Brasileira de Meteorologia

Print version ISSN 0102-7786


SELUCHI, Marcelo Enrique  and  SAULO, Andrea Celeste. The Northewestern Argentinean Low and The Chaco Low : their characteristics, differences and similarities. Rev. bras. meteorol. [online]. 2012, vol.27, n.1, pp.49-60. ISSN 0102-7786.

The Chaco Low and the Northwestern Argentinean Low are frequently confounded or treated as a single system, due to our limited knowledge about them (especially concerning the Chaco Low), the low resolution of global analyses -that show them as a single low pressure system-, and the relatively poor data coverage over the region where they are usually located. This article aims to contribute to a better understanding of the differences and similarities between them, as well as to analyze the atmospheric dynamical and thermo-dynamical conditions where they evolve. It is considered that this study will aid to a better recognition of both systems. With this purpose, regional reanalyses from the Eta/CPTEC model for the 2000-2004 period has been used. The article focuses in summer months, since both low-pressure systems are more active during this season. Results show that the Northwestern Argentinean Low is more related to transient activity, as can be deducted from the subtropical jet influence on this system and also from the temporal variability of some key variables -such as the sea level pressure and the equivalent potential temperature-. From a thermo-dynamic point of view, the Chaco Low develops in a more unstable environment and is less influenced by middle latitude dynamics.

Keywords : Thermal low; synoptic climatology; thermo-dynamical structure.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License