Rainfall variations of Sri Lanka Part 1: Spatial and temporal patterns
Rainfall variations of Sri Lanka Part 1: Spatial and temporal patterns
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斯里兰卡的降雨变化第 1 部分：时空格局
DOI：
10.1007/bf02269446
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
M. Yoshino
中科院分区：
文献类型：
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作者：
R. Suppiah;M. Yoshino
为了研究斯里兰卡的时空格局，本研究分析了斯里兰卡29个测站1881-1980年间的月降雨量资料。首先，采用经验正交函数分析方法对月降水量异常进行分析。结果表明，优势度空间格局明显。第一个特征向量占总方差的40.2%，第二个特征向量占总方差的11.1%，解释了受地形影响最明显的现存格局。其中，前者主要由10~2月(东北季风)的降雨型所解释，后者主要由5~9月(西南季风)的降雨型所解释。第一特征向量时间系数的功率谱表现为40、24和14-15个月的周期，而第二特征向量的时间系数表现为120和40个月的周期。最后，根据前两个特征向量的空间系数，对斯里兰卡的降雨量波动进行了区域划分。
In order to study the spatial and temporal patterns in Sri Lanka, monthly rainfall data at 29 stations for the period 1881-I980 were analysed in this study. First, Empirical Orthogonal Function analysis method was applied for the monthly rainfall anomalies. The result indicated clear dominant spatial patterns. The first eigenvector accounts for 40.2% and the second for 11.1% of the total variance explain the most apparently existing patterns with orographic influences. In particular, the former is explained by the rainfall patterns in the period between October and February (northeast monsoon), and the later by that in May to September (southwest monsoon) period. Power spectra of first eigenvector's time coefficients revealed cycles at 40, 24 and 14-15 months, while the second eigenvector's time coefficients indicated at 120 and 40 months. Lastly, a regional division by rainfall fluctuations is presented for Sri Lanka based on the space coefficients of first two eigenvectors.