Influence of the Northern Hemisphere annular mode on ENSO
| Project/Area Number |
22654055
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Mie University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Tetsu 独立行政法人国立環境研究所, 地球環境研究センター, 特別研究員 (90514331)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKAHASHI Hiroshi 首都大学東京, 都市環境科学研究科, 助教 (50397478)
HARA Masayuki 独立行政法人海洋研究開発機構, 地球環境変動領域, 技術研究主事 (90399569)
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | 北極振動 / エルニーニョ / 北大西洋振動 / CMIP3 / WP / マルチモデルアンサンブル / 豪雪 / ENSO予測 / 気候力学 / cold surge / AO / ENSO / Dry surge / 西風バースト |
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| Research Abstract |
The influence of the Northern Hemisphere annular mode(NAM) on the El Nino/Southern Oscillation(ENSO) was examined using 41-year reanalysis data and an atmospheric general circulation model(AGCM). Significant lag correlations between the NAM index for spring and the Nino-3 index for the following winter were revealed. An anomalous lower tropospheric westerly associated with modulation of the westerly wind burst(WWB) over the western tropical Pacific in spring often coincided with the positive phase of the NAM and extended eastward during summer and autumn. Then, warm sea surface temperature(SST) anomalies reflecting El Nino appeared over the eastern tropical Pacific in early winter. In an AGCM experiment in which SSTs were fixed as a climatological-mean monthly distribution, the interannual modulation of WWB was significantly associated with NAM variability in spring, supporting the possible influence of the NAM in spring on an ENSO outbreak the following winter.
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Report
(3 results)
Research Products
(25 results)
