The interannual relationships between indices representing the El Niño–Southern
Oscillation (ENSO), the monsoon, and extreme precipitation in the Philippines during boreal
summer (July–September, JAS), and fall (October–December, OND), was revealed using the
nonparametric measure of monotonic relationship between two variables. The extreme
precipitation indices were calculated from the observed daily rainfall data from 35 meteorological
stations during a 60-year (1951–2010) period of study. Results show that the wet (dry) indices of
extreme precipitation are significantly negatively (positively) correlated with the Niño 3.4 index
during OND; whereas only few stations have significant correlations during JAS. It was found that
the strength of the monsoon, which is measured by the western North Pacific summer monsoon
index (WNPMI), is highly correlated with precipitation indices for stations located in the western
section of the country during JAS. These findings suggest that while the ENSO controls much of
the interannual variation of precipitation indices during OND, the governing influence of
monsoonal activity is well-pronounced during JAS, particularly in the western section of the
Philippines.
雑誌名
Geographical reports of Tokyo Metropolitan University
巻
49
ページ
23 - 32
発行年
2014
ISSN
03868710
書誌レコードID
AA00200173
著者版フラグ
publisher
出版者
Department of Geography, Tokyo Metropolitan University
The seasonal role of ENSO and monsoon on the interannual variations of rainfall extremes in the Philippine
20005-49-003.pdf
(1.96MB)
