As Massas de Ar da América do Sul: (SEGUNDA PARTE)

The present work written by the meteorologists Adalberto Serra, from the Meteorological Service and head of its Research Department and Leandro Ratisbonna from the same Service, describes the Air Masses of South America following the scientific ideas valid at the time of their publication (1942), It... Ausführliche Beschreibung

1. Person: Serra, Adalberto
Weitere Personen: Ratisbonna, Leandro verfasserin
Quelle: in Revista geográfica Vol. 26, No. 52 (1960), p. 41-61
Weitere Artikel
Format: Online-Artikel
Sprache: Portuguese
Veröffentlicht: 1960
Beschreibung: Online-Ressource
Schlagworte: research-article
Online Zugang: Volltext
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245 1 3 |a As Massas de Ar da América do Sul: (SEGUNDA PARTE)  |h Elektronische Ressource 
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520 |a The present work written by the meteorologists Adalberto Serra, from the Meteorological Service and head of its Research Department and Leandro Ratisbonna from the same Service, describes the Air Masses of South America following the scientific ideas valid at the time of their publication (1942), Its reedition became necessary once the few mimeographed copies of the first edition had run out and the progress of science since that year did not demand significant modifications of the original text. The study begins with a description of the surface (land and water) of the South American continent marking the ice bouderies, describing the ocean currents as well as considering the distribution of vegetation on the continent. A general description of the general circulation follows with several isobaric systems and seasonal wind-flow patterns related to the high pressure cells of the Pacific and Atlantic and low pressure cells centered over the continent and polar region. This part is completed in the next chapter where the opper circulation is studied with detail. The concepts of trade and antitrade winds and zonal discontinuity are well explained, indicating the different patterns in winter and summer. There is a special chapter concerning the regions that give origin to the different air masses (antartic, polar tropical, equatorial and upper regions) showing that the association of a uniform surface and a definite circulation are necessary conditions for the formation of air masses. On the other hand, the zones where the different air masses are brought together ar explained shead. The polar fronts (Atlantic and Pacific) and the intertropical front are the most important ones, the antarctic front having an occasional influence. Next comes a description of the characteristics of air masses: the equatorial air masses of the North and South Atlantic, the equatorial continental and the equatorial of the South Pacific; the tropical air masses: continental, Atlantic and Pacific; the upper air mass; the low temperature air masses; antarctic, ative polar and the returning circulation of the polar air mas. The perturbations along there various fronts are also studied (antarctic, polar Pacific and Polar Atlantic) so as to describe the secondary circulation in the higher latitudes. The study then considers the equatorial perturbations, but as far as recent research is concerned it is quite incomplete. Nevertheless it maintains a historical interest. Next comes a detailed description of air masses having in mind the varied weather phenomena and weather types caused by these air masses in different regions. Greater detail is given to the polar masses directly responsable for the weather in most parts of the continent. In the last chapter the authors consider the "Climatic influence of the Ais Masses", which permits to distinguish fourteen climatic zones in South America. It is one of the most interesting chapters, still up to date, with a special interest for geographers. We include in this work a general table with the characteristics of the air masses for the theree sounding stations by plane: Rio de Janeiro, Florianópolis, Alegrete, including the following data: w — specific humidity (g) (kg); t — air temperature; e — equivalent potential temperature; H.R. — relative humidity. To such symbols one must add the following constants: d — potential temperature of dry air P — atmospheric pressure h — relative humidity. 
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773 0 8 |i in  |t Revista geográfica  |d México, DF : Inst  |g Vol. 26, No. 52 (1960), p. 41-61  |q 26:52<41-61  |w (DE-601)JST074492659  |x 0031-0581 
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952 |d 26  |j 1960  |e 52  |h 41-61 

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