Workshops

Pacific and Atlantic Decadal Variability Reflected by the Winter Temperature in Taiwan During the Period 1911-2010

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Workshops

Mong-Ming Lu

2012-09-19
12:00:00 - 12:25:00

101 , Mathematics Research Center Building (ori. New Math. Bldg.)

One hundred years of temperature data at six Taiwan stations are decomposed using the data adaptive method Ensemble Empirical Mode Decomposition (EEMD) to five intrinsic mode functions (IMFs) and a centennial secular trend (ST). Significant multi-decadal modes (period > 40 years) in winter and the associated warm (1930s and 1940s) and cold (1970s and 1980s) decades are identified. The decades from early 1950s to mid-1970s are the transition years from warm to cold, while the recent decades since 1990 are the transition from cold to warm. The ST shows much larger warming rate than the linearly regressed trend. The multi-decadal modes of Taiwan temperature are in-phase with the AMO and global mean temperatures. The termination of the warm (cold) regime is associated with the weakening (strengthening) of the North Pacific subtropical gyre. The rapid warming after 1990s can be resulted from the combined effect of negative PDO and positive NPGO, although anthropogenic influence cannot be ruled out.

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