Darwin sea level pressure, 1876-1996: Evidence for climate change?

Details Darwin sea level pressure, 1876-1996: Evidence for climate change? Darwin sea level pressure, 1876-1996: Evidence for climate change?

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1779h&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 14, p. 1779-1782

Physics

15

Global Change: General Or Miscellaneous, Oceanography: General: Climate And Interannual Variability, Oceanography: Physical: El Nino

Scientific paper

It has been argued that there was a period of prolonged ENSO conditions between 1990-95 so anomalous that it is ``highly unlikely'' to be due to ``natural decadal-timescale variation'' [Trenberth and Hoar, 1996]. This conclusion follows from their study of the Darwin sea level pressure anomaly record, which found that the 1990-95 period would occur randomly about once every 1100-3000 yrs. Taking into account the uncertainty in number of degrees of freedom in the Darwin time series, we find that conditions like those of 1990-95 may be expected as often as every 150-200 yrs at the 95% confidence level. Student's-t, ARMA, and Bootstrap/Monte Carlo tests of the time series all yield similar results. We therefore suggest that the 1990-95 period may plausibly be an aspect of the natural variability of the tropical Pacific.

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