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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
Peer-reviewed Journal Articles, etc >
SST-Forced and Internal Variability of the Atmosphere in an Ensemble GCM Simulation
| Title: | SST-Forced and Internal Variability of the Atmosphere in an Ensemble GCM Simulation |
| Authors: | Matsumura, Shinji Browse this author | | Huang, Gang Browse this author | | Xie, Shang-Ping Browse this author | | Yamazaki, Koji Browse this author |
| Issue Date: | 19-Mar-2010 |
| Publisher: | Meteorological Society of Japan |
| Journal Title: | Journal of the Meteorological Society of Japan |
| Volume: | 88 |
| Issue: | 1 |
| Start Page: | 43 |
| End Page: | 62 |
| Publisher DOI: | 10.2151/jmsj.2010-104 |
| Abstract: | A 20-member ensemble simulation has been conducted with an atmospheric general circulation model to investigate the time-space characteristics of the leading modes of internal and SST-forced variability in the winter Northern Hemisphere. Each of the 20 integrations is forced by the identical global sea surface temperature (SST) and sea ice history observed for 1959-1998, and differs only in the initial conditions. A variance analysis is performed to quantify the relative importance of the SST-forced and internal variability. In the extratropics, the SST-forced signals are much higher in the North Pacific than in the North Atlantic where month-to-month and interannual variability is dominated by internal chaos. The leading empirical orthogonal function mode resembles the Arctic Oscillation (AO) for both the internal and ensemble-mean variability but with significant differences in correlation between the Pacific and Atlantic centers of action. The Pacific-Atlantic correlation is significantly higher for the ensemble mean than for all but one member integration. The correlation between the Arctic and midlatitude North Atlantic, by contrast, is higher in individual member runs than in the ensemble-mean. These results suggest that SST-forced variability is organized into a hemispheric AO pattern while internal variability is more confined in the North Atlantic sector. Seasonal air-sea interactions in the North Pacific and Atlantic are also discussed. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/43127 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山崎 孝治
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