Influence of Tropical Cyclone Landfalls on Spatiotemporal Variations in Typhoon Season Rainfall over South China |
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Authors: | Min-Hee LEE Chang-Hoi HO and Joo-Hong KIM |
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Institution: | Computational Science and Technology, Seoul National University, Seoul, Korea,rainfall, tropical cyclone, South China, typhoon season,Met Office Hadley Centre, Exeter, United Kingdom |
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Abstract: | This study examined the impact of tropical cyclone (TC) landfalls on the
spatiotemporal variations in the rainfall over South China for the period
1957--2005. The target region was selected to show the noteworthy
contribution of TC landfalls to the total rainfall during the typhoon season
(July--October). Two prevailing spatial variations in the rainfall were
obtained from an EOF analysis. The first EOF mode displays single-sign
variability over South China with an explained variance of 23.4%. The
associated time series of this mode fluctuates on a decadal timescale and
was found to be correlated with TC genesis in the South China Sea. The
second EOF mode shows a seesaw pattern between Hainan Island/Guangdong
Province and the remaining regions with an explained variance of 11.4%.
This seesaw pattern results from an anti-correlation in seasonal TC
landfalls between the two regions, which was found in previous studies. This
is related to the strengthening (weakening) of the upper tropospheric jets
and the corresponding development of a massive anticyclonic (cyclonic)
circulation over East Asia. The EOF analysis was also conducted using just
the data for rainfall caused by landfalling TCs. This revealed that the
first EOF mode using just the TC-induced rainfall is nearly identical to the
second mode from the total rainfall. The obvious seesaw pattern of the first
mode when employing just the TC-induced rainfall in the EOF analysis implies
that this pattern has larger temporal variability than the single-signed
pattern (i.e., the first EOF mode using the total rainfall) in terms of TC
landfalls. This study suggests that TC landfalls over South China and the
accompanying rainfall significantly modulate the spatial variation of the
typhoon season rainfall there. |
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Keywords: | rainfall tropical cyclone South China typhoon season |
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