|El Niño-like Climate Teleconnections in New England During the Late Pleistocene|
El Niño-like Climate Teleconnections in New England During the Late Pleistocene
Science v.288, pp. 1039-1042, 12 May 2000.
Tammy M. Rittenour
Michael E. Mann
A glacial varve chronology from New England spanning the 4000-year period from 17,500 to 13,500 calendar years before present was analyzed for evidence of climate variability during the late Pleistocene. The chronology shows a distinct interannual (3 to 5 years) band of enhanced variability suggestive of El Niño-Southern Oscillation (ENSO) teleconnections into North America during the late Pleistocene, when the Laurentide ice sheet was near its maximum extent and climatic boundary conditions were different than those of today. This interannual variability largely disappears by the young end of the 4000-year chronology, with only the highest frequency components (roughly 3-year period) persisting. This record provides evidence of ENSO-like climate variability during near-peak glacial conditions.
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It was published in Science v.288, pp. 1039-1042, 12 May 2000.
|Click for larger figure
|| Fig. 2 (left)
Normal curves of varve thickness.
(A)Raw varve couplet thickness
(B) Natural log of varve thickness data
(C) Filtered and Standardized natural log
Fig. 3 (top right)Spectral Analysis
Fig. 4 (lower right) Evolutive Spectral Analysis
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National Oceanic and Atmospheric Administration
2000 June 28