Document Type

Article

Publication Title

Journal of Geophysical Research

Publisher

American Geophysical Union

Publication Date

1993

First Page

12,839

Last Page

12,847

Issue Number

D7

Volume Number

98

Abstract/ Summary

The last millenium of Earth history is of particular interest because it documents the environmental complexities of both natural variability and anthropogenic activity. We have analyzed the major ions contained in the Greenland Ice Sheet Project 2 (GISP 2) ice core from the present to ∼674 A.D. to yield an environmental reconstruction for this period that includes a description of nitrogen and sulfur cycling, volcanic emissions, sea salt and terrestrial influences. We have adapted and extended mathematical procedures for extracting sporadic (e.g., volcanic) events, secular trends, and periodicities found in the data sets. Finally, by not assuming that periodic components (signals) were “stationary” and by utilizing evolutionary spectral analysis, we were able to reveal periodic processes in the climate system which change in frequency, “turn on,” and “turn off” with other climate transitions such as that between the little ice age and the medieval warm period.

Citation/Publisher Attribution

Mayewski, P. A., L. D. Meeker, M. C. Morrison, M. S. Twickler, S. I. Whitlow, K. K. Ferland, D. A. Meese, M. R. Legrand, and J. P. Steffensen (1993), Greenland Ice Core “Signal” Characteristics: An Expanded View of Climate Change, Journal of Geophysical Research, 98(D7), 12,839–12,847, doi:10.1029/93JD01085.

Publisher Statement

© Copyright 1993 American Geophysical Union

DOI

10.1029/93JD01085

Version

publisher's version of the published document