RELATIONSHIPS BETWEEN PRECEDING PACIFIC SEA SURFACE TEMPERATURES AND SUBTROPICAL HIGH INDEXES OF MAIN
RAINING SEASONS |
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| Authors: | YAO Yu and YAN Hua-sheng |
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| Institution: | 1. Kunming Meteorological Observatory,Kunming 650034 China;Institute of Resource and Earth Science,Yunnan University,Kunming 650091 China
2. Institute of Resource and Earth Science,Yunnan University,Kunming 650091 China |
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| Abstract: | With correlation analysis and factor analysis methods, the effects of preceding Pacific SSTs on
subtropical high indexes of main raining seasons are discussed. The results of correlation analysis show
that the effects of SSTs on five subtropical high indexes differ in seasons and regions. The variation of
SSTs mostly affects the area and intensity indexes of the subtropical high, followed by the western ridge
index, and the effect on the ridge line index is more remarkable than on the north boundary index. The
results of factor analysis reveals that the first common factor of SST of each season reflected mainly the
inverse relation of SSTs variation between the central and eastern part of equatorial Pacific and the
western Pacific, which correlates better with the subtropical high indexes in the main raining seasons than
other common factors of SST. The analysis of interdecadal variation indicated that the variation of SSTs
was conducive to the emergence of the La Ni?a event before the end of 1970s, such that in the summer the
subtropical high is likely to be weaker and smaller and located eastward and northward. After the 1980s,
the opposite characteristics prevailed. |
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| Keywords: | climatology relationship correlation analysis factor analysis sea surface temperature subtropical
high index |
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