Influence of variations in extratropical wintertime teleconnections on Northern Hemisphere temperature
- National Center for Atmospheric Research, Boulder, CO (United States)
The purpose of this paper to illustrate and quantify the relationship between the circulation changes and surface temperature anomalies in the northern hemisphere during winter. Multivariate linear regression was used to regress three indices on the northern hemisphere extratropical temperature anomolies for each winter since 1935. The indices regressed were the North Atlantic Oscillation, the North Pacific, and the Southern Oscillation; these were selected because they relate to well understood circulation anomolies that have persisted for much of the past two decades. Elements of the temperature anomaly pattern since the mid-1970s resemble the greenhouse warming fingerprint predicted by some general circulation models; however, it is difficult to assess the cause. The changes in circulation since the mid-1970s have resulted in a particular surface temperature anomaly pattern that has amplified the hemispheric-averaged warming because of the interaction with land and ocean. 7 refs., 3 figs.
- OSTI ID:
- 535477
- Report Number(s):
- CONF-970207--
- Country of Publication:
- United States
- Language:
- English
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