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THE CHARACTERISTICS OF LOW-LATITUDE FLOW PATTERNS OVER SOUTHEAST ASIA AND WESTERN PACIFIC FROM OCTOBER TO DECEMBER,
EMMANUEL COLL BOSTON MASS ORIENTAL SCIENCE LIBRARY
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Based on a study of the 1958 - 1959 data, the large-scale flow patterns over the Western Pacific at low latitudes in early winter may be classified into two types according to the vertical extent of the anticyclonic flow of the subtropical high, viz., the shallow subtropical high type and the deep subtropical high type. The former is characterized by a low zonal index at high latitudes and moderate development of easterly waves in the lower troposphere near the equator with the subtropical jet in phase with its mean position. The latter is characterized by a high zonal index at high latitudes and the presence of equatorial westerlies in the lower troposphere with the subtropical jet completely out of phase with its mean position. Typhoons may also form in the equatorial belt of convergence in the latter pattern. The sequential occurrence of these two types seems to follow a quasi-periodic oscillation with a period of about one month. Author
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