Influence of the Northern Hemisphere annular mode on ENSO

2011 Fiscal Year Final Research Report

• Project/Area Number: 22654055
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Mie University
• Principal Investigator: TACHIBANA Yoshihiro 三重大学, 大学院・生物資源学研究科, 教授 (10276785)
• 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)
• 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)
• Project Period (FY): 2010 – 2011
• Keywords: 北極振動 / エルニーニョ / 北大西洋振動 / CMIP3

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.

Research Products

• [Journal Article] A possible cause of the AO polarity reversal from winter to summer in 2010 and its relation to hemispheric extreme summer weather (2012)
  • Author(s): Y. Tachibana, T. Nakamura
  • Journal Title: Climate Dynamics
• [Journal Article] 異常気象をもたらす大気の大波「北極振動」と2010年猛暑の関係 (2012)
  • Author(s): 立花義裕, 大富裕里子, 中村哲
  • Journal Title: 三重大学生物資源学研究科紀要 Volume: 38 Pages: 75-97
• [Journal Article] The nature of Arctic polar vortices in chemistry-climate models (2012)
  • Author(s): Mitchell, D. M., A. J. Charlton-Perez, L. J. Gray, H. Akiyoshi, N. Butchart, S. C. Hardiman, O. Morgenstern, T. Nakamura, E. Rozanov, K. Shibata, D. Smale and Y. Yamashita
  • Journal Title: Q. J. R. Meteorol. Soc.
  • DOI: doi:10.1002/qj.1909
• [Journal Article] Using transport diagnostics to understand chemistry climate model ozone simulations (2011)
  • Author(s): Strahan, S. E., A. R. Douglass, R. S. Stolarski, H. Akiyoshi, S. Bekki, P. Braesicke, N. Butchart, M. P. Chipperfield, D. Cugnet, S. Dhomse, S. M. Frith, A. Gettelman, S. C. Hardiman, D. E. Kinnison, J.-F. Lamarque, E. Mancini, M. Marchand, M. Michou, O. Morgenstern, T. Nakamura, D. Olivie, S. Pawson, G. Pitari, D. A. Plummer, J. A. Pyle, J. F. Scinocca, T. G. Shepherd, K. Shibata, D. Smale, H. Teyssedre, W. Tian, and Y. Yamashita
  • Journal Title: Journal of Geophysical Research Volume: 116 Pages: D17302
  • DOI: doi:10.1029/2010JD015360
• [Journal Article] Recurrence of Intraseasonal Cold Air Outbreak during the 2009/2010 Winter in Japan and its Ties to the Atmospheric Condition over the Barents-Kara Sea (2011)
  • Author(s): Hori, E. M, J. Inoue, T. Kikuchi, M. Honda, and Y. Tachibana
  • Journal Title: SOLA Volume: 7 Pages: 25-28
• [Journal Article] The recent trend of increasing precipitation in Sahel and the associated inter-hemispheric dipole of global SST (2011)
  • Author(s): Munemoto, M. and Y. Tachibana
  • Journal Title: nternational Journal of Climatology
• [Journal Article] Projections of UV radiation changes in the 21st century: impact of ozone recovery and cloud effects (2011)
  • Author(s): Bais, A. F., K. Tourpali, A. Kazantzidis, H. Akiyoshi, S. Bekki, P. Braesicke, M. P. Chipperfield, M. Dameris, V. Eyring, H. Garny, D. Iachetti, P. Jockel, A. Kubin, U. Langematz, E. Mancini, M. Michou, O. Morgenstern, T. Nakamura, P. A. Newman, G. Pitari, D. A. Plummer, E. Rozanov, T. G. Shepherd, K. Shibata, W. Tian, and Y. Yamashita
  • Journal Title: Atmospheric Chemistry and Physics Volume: 11 Pages: 7533-7545
  • DOI: doi:10.5194/acp-11-7533-2011
• [Journal Article] Long-term changes in rainfall and tropical cyclone activity over South and Southeast Asia (2011)
  • Author(s): Takahashi, H. G.
  • Journal Title: Adv. Geosci Volume: 30 Pages: 17-22
  • DOI: doi:10.5194/adgeo-30-17-2011
• [Presentation] 中・高緯度における大気海洋双方向相互作用 (2011)
  • Author(s): 立花義裕
  • Organizer: 日本海洋学会西南支部・海洋気象学会・水産海洋学会合同シンポジウム
  • Place of Presentation: 長崎大学
  • Year and Date: 2011-12-07
• [Presentation] ハロゲンと温室効果ガス濃度変化に伴う北半球夏期対流圏の気候変化とその将来予測 (2011)
  • Author(s): 中村哲,秋吉英治
  • Organizer: 日本気象学会2011年度秋季大会
  • Place of Presentation: 名古屋
  • Year and Date: 2011-11-17
• [Presentation] An Inter-comparison of Observation System Experiments for Stratospheric Ozone between LETKF Data Assimilation Systems with CCSR/NIES CCM (2011)
  • Author(s): Nakamura, T., M. Deushi, K. Miyazaki, C. Kobayashi, H. Akiyoshi, K. Shibata, and T. Iwasaki
  • Organizer: MRI CCM, and CHASER CTM, IUGG2011
  • Year and Date: 2011-07-03
• [Presentation] 2010年夏の北極振動指数(SV NAM)異常とそれに関連した半球規模の猛暑 (2011)
  • Author(s): 立花義裕,大富裕里子,中村哲
  • Organizer: 日本気象学会2011年度春季大会,国立オリンピック記念青少年総合センター
  • Year and Date: 2011-05-18
• [Book] 2010年夏日本の猛暑 (2010)
  • Author(s): 大富祐里子,立花義裕,中村哲
  • Total Pages: 55-64
  • Publisher: 日本気象学会
• [Remarks] ホームページ
  • URL: http://www.bio.mie-u.ac.jp/kankyo/shizen/lab1/AOindex.htm
• [Remarks]
  • URL: http://www.bio.mie-u.ac.jp/kankyo/shizen/lab1/