| 摘要: |
| 北太平洋经向翻转环流（NPMOC）是北太平洋所有经向翻转环流圈的总称，拥有5个环流圈结构.其中，热带环流圈（TC）、副热带环流圈（STC）和深层热带环流圈（DTC）位于北太平洋热带副热带海域，是该海域间经向物质和能量交换的重要通道.主要运用NEMO模式对这3个经向翻转环流圈的年际变化特征和机理进行了研究.结果表明，TC、STC和DTC的经向流量都具有显著的年际变化特征：在El Nio期间，TC的南、北向流量均减弱，STC的北向流量增强、南向流量减弱，DTC的南向流量减弱；而在La Nia期间则相反.敏感性试验表明，在风应力强迫下得到的TC、STC南、北向流量和DTC南向流量的年际变化特征都很显著，并与在风应力、热通量和淡水通量共同强迫下得到的结果非常一致；而仅在热通量和淡水通量的强迫下，各分支流量的年际变化均较小.由此可见，风场驱动是引起北太平洋经向翻转环流年际变化的主要驱动因素，而热通量和淡水通量的影响却较小. |
| 关键词: 物理海洋学 北太平洋 经向翻转环流 年际变化 NEMO模式 |
| DOI：10.3969/J.ISSN.2095-4972.2016.03.003 |
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| 基金项目:国家自然科学基金资助项目（41406012）；卫星海洋环境动力学国家重点实验室开放基金资助项目（SOED1613）; 国家海洋局海洋 大气化学与全球变化重点实验室开放基金资助项目（GCMAC1501）；山东省自然科学基金资助项目（ZR2014DP011）；国家自然科学基金委员会 山东省人民政府联合资助海洋科学研究中心资助项目（U1406401）；中国科学院海洋环流与波动重点实验室开放基金资助项目（KLOCAW1405） |
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| Numerical study on the interannual variation of the North Pacific meridional overturning circulation |
| LIU Hongwei,ZHANG Qilong,XU Yongsheng,DUAN Yongliang |
| (Institute of Oceanology， Chinese Academy of Sciences， Qingdao 266071， China;State Key Laboratory of Satellite Ocean Environment Dynamics，Second Institute of Oceanography， SOA， Hangzhou 310012， China;Key Laboratory of Ocean Circulation and Waves，Institute of Oceanology， Chinese Academy of Sciences， Qingdao 266071， China;4. Qingdao National Laboratory for Marine Science and Technology， Qingdao 266237， China;First Institute of Oceanography， SOA， Qingdao 266061， China) |
| Abstract: |
| The North Pacific meridional overturning circulation （NPMOC） is the general name of all the North Pacific overturning cells， and it has 5 cells. The tropical cell （TC）， the subtropical cells （STC） and the deep tropical cell （DTC） are located in the TropicalSubtropical region of the North Pacific and are important leakage of the meridional material and energy exchange. Based on NEMO modeling， the mechanisms controlling the interannual variations of TC， STC and DTC meridional transports are studied in this paper. The numerical experiments reveal that TC， STC and DTC all show strong interannual variations associated with ENSO. Both the northward and southward transport branches of TC weaken in El Nio years and strengthen in La Nia years. As to STC， the northward transport strengthens in El Nio years and weakens in La Nia years， while the southward transport weakens in El Nio years and strengthens in La Nia years. The southward transport of DTC decreases in El Nio years and increases in strong La Nia years. The changes in the wind stress is the primary factor of the interannual variations of NPMOC， while the heat and freshwater flux play minor role in the interannual variations of STC and DTC except TC． |
| Key words: physical oceanography the North Pacific meridional overturning circulation interannual variation NEMO |
