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Global climate change.

R B Alley1, J Lynch-Stieglitz, J P Severinghaus

  • 1Earth System Science Center and Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA. ralley@essc.psu.edu

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1999
PubMed
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Past climate changes were abrupt shifts between modes, not gradual changes. These "band jumps" may recur and be influenced by human activities, impacting future climate stability.

Area of Science:

  • Paleoclimatology
  • Climate System Dynamics

Background:

  • Earth's climate has experienced significant, abrupt shifts over geological timescales.
  • Modern human civilization, including agriculture and industry, developed during a period of unusual climate stability.

Purpose of the Study:

  • To interpret past abrupt climate changes using new high-resolution sediment core analyses.
  • To understand the mechanisms driving these climate shifts and their potential recurrence.

Main Methods:

  • Multiproxy analysis of sediment cores.
  • Application of physically based transfer functions for data interpretation.
  • Reconstruction of past climate variability at high resolution.

Main Results:

  • Past climate changes are interpreted as rapid transitions between distinct climate system states, termed "band jumps".

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  • These abrupt shifts occurred on regional-to-global scales.
  • High-resolution sediment core data provide robust evidence for these past events.

    • Conclusions:

    • The climate system can undergo abrupt "band jumps" between modes of operation.
    • Such events have characterized much of the last 100,000 years.
    • The recurrence of these climate band jumps is possible and may be influenced by anthropogenic factors.