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Ka-Kit Tung

2012-09-18
10:35:00 - 11:25:00

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

Our work was inspired by the paper of Wu et al. [2011] , who showed, using the novel method of Ensemble Empirical Mode Decomposition (Wu and Huang [2009 ]; Huang et al. [1998] ), that there exists, in the 150-year global mean surface temperature record, a multi-decal oscillation. With an estimated period of 65 years, 2.5 cycles of such an oscillation was found in that global record. They further argued that it is related to the Atlantic Multi-decadal Oscillation (AMO) and, if this oscillation is separated out, a monotonic trend emerges in the global mean temperature, with little acceleration of warming. Given the importance of this last implication on the recent anthropogenic global warming, it is quite natural that the scientific community is demanding more evidence that this oscillation is real, recurrent and natural, and in particular evidence that it is not a response to time varying anthropogenic forcing that happens to look like an oscillation.

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