The Influence of Atlantic Sea Surface Temperature Anomalies on the North Atlantic Oscillation
The influence of Atlantic sea surface temperature (SST) anomalies on the atmospheric circulation over the North Atlantic sector during winter is investigated by performing experiments with an atmospheric general circulation model (GCM). These consist of a 30year run with observed SST anomalies for t...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.47.1727 http://www.atmos.ucla.edu/~yjkim/paper/RMK98_text.JC.ps |
| Summary: | The influence of Atlantic sea surface temperature (SST) anomalies on the atmospheric circulation over the North Atlantic sector during winter is investigated by performing experiments with an atmospheric general circulation model (GCM). These consist of a 30year run with observed SST anomalies for the period 1961--90 confined geographically to the Atlantic Ocean, and of a control run with climatological SSTs prescribed globally. The simulated monthly variance of 500-mb geopotential heights over the North Atlantic attains more realistic values when observed Atlantic SSTs are prescribed. The latter are not found not to make marked changes to the structure of the model's preferred modes of variability over the North Atlantic, as determined by the leading EOFs of monthly means, and a cluster analysis of daily fields. However, circulation patterns which resemble the positive phase of the North Atlantic Oscillation (NAO), are more pronounced when observed Atlantic SSTs are prescribed; the va. |
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