我国西部降水量的准三年周期

徐国昌;董安祥

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高原气象 ›› 1982, Vol. 1 ›› Issue (2) : 11-17.
论文

我国西部降水量的准三年周期

  • 徐国昌;董安祥
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THE QUASI-THREE YEAR PERIOD OF PRECI-PITATION IN THE WEST OF OHINA

  • Xu Guochang;Dong Anxiang
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摘要

本文利用我国西部110°E以西70个站的资料,用周期图和功率谱方法计算分析了降水量周期,发现最显著的周期是准三年周期,主要表现在35°N以北,即青藏高原的北侧,高原东北侧最明显。准三年周期主要表现在春季和夏季。从三十年代到七十年代准三年周期比较稳定。它的形成可能与南亚高压脊线准三年周期的南北振荡有关。另外,我国西部还存在着一个次要的周期是10-13年周期。

Abstract

In this paper, using the precipitation data of 70 stations in the west of China, we have calculated the precipitation periods by the methods of periodogram analysis and power spectrum. It is found that the prevailing period is the quasi-three year period that appears mainly。to the north of 350°N,i.e. to the north of Qinghai-Xizang Plateau, and it is most apparent on the Plateau's northeast.The puasi-three year period of precipitation appears principally in spring and summer. From 1930s to 1970s, the quasi-three year period of the precipitation is relatively stationary. Its formation may be associated with quasi-three year latitudinal oscillation of the ridge line of southern Asia.In addition, there is a minor period of precipitation in the west of China, i.e. the ten to thirteen year period.

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徐国昌;董安祥. 我国西部降水量的准三年周期. 高原气象. 1982, 1(2): 11-17
徐国昌;董安祥. THE QUASI-THREE YEAR PERIOD OF PRECI-PITATION IN THE WEST OF OHINA. Plateau Meteorology. 1982, 1(2): 11-17

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