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The annual change in the tropospheric circulation and the rainfall in South America

Die Änderung der troposphärischen Zirkulation im Jahresgang und der Regen in Südamerika

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Summary

The relationship between the annual change in the tropospheric circulation and rainfall in the tropical and subtropical regions in South America was investigated. The 850 mb and 150 mb level circulations are chosen in this study to represent lower and upper branches of the Hadley type circulation. The monthly upper air data for a 10-year period from 1969 to 1978 are used to obtain the climatology of the annual change in the tropospheric circulation. The monthly total precipitation for a same 10-year period is used to compare the rainfall regime to the seasonal change in the tropospheric circulation. It was shown that the complex pattern of the annual change in the rainfall regime were under a strong influence of the major components of the tropospheric circulation.

Zusammenfassung

Es wird die Beziehung zwischen der Änderung der troposphärischen Zirkulation und der Verteilung des Regens in den tropischen und subtropischen Regionen von Südamerika untersucht. Die Zirkulationen im 850 mb- und im 150 mb-Niveau wurden zum Studium des unteren und des oberen Zweiges der Hadley-Zirkulation ausgewählt. Die Monatswerte der Daten aus der oberen Atmosphäre aus der 10jährigen Periode 1969–1978 wurden für eine Klimatologie der Änderung der troposphärischen Zirkulation verwendet. Der monatliche Gesamtniederschlag aus derselben 10jährigen Periode wurde für den Vergleich des Regenregimes mit der jahreszeitlichen Änderung der troposphärischen Zirkulation benutzt. Es wird gezeigt, daß das komplexe Bild von der Änderung des Regenregimes im Jahresgang von Hauptkomponenten der troposphärischen Zirkulation stark beeinflußt wird.

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Authors and Affiliations

  1. Institute of Geoscience, The University of Tsukuba, 305, Ibaraki, Japan

    T. Nishizawa & M. Tanaka

  2. Electronic Computation Center, Japan Meteorological Agency, Japan

    M. Tanaka

Authors
  1. T. Nishizawa
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  2. M. Tanaka
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Nishizawa, T., Tanaka, M. The annual change in the tropospheric circulation and the rainfall in South America. Arch. Met. Geoph. Biocl., Ser. B 33, 107–116 (1983). https://doi.org/10.1007/BF02273994

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  • DOI: https://doi.org/10.1007/BF02273994

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