| ZHU Yaohua,SUN Junchuan,WEI Zexun,WANG Yonggang,FANG Guohong,QU Tangdong. 2017. A fresh look at the deepwater overflow in the Luzon Strait. Acta Oceanologica Sinica, 36(5):1－8 |
| A fresh look at the deepwater overflow in the Luzon Strait |
| 对吕宋海峡深水瀑布的重新认识 |
| Received:December 06, 2016 |
| DOI：10.1007/s13131-017-1057-4 |
| Key words:Luzon Strait deepwater overflow seasonal variability South China Sea |
| 中文关键词: 吕宋海峡 深水瀑布 季节变化 南海 |
| 基金项目:The National Natural Science Foundation of China (NSFC)-Shandong Joint Fund for Marine Science Research Centers of China under contract No. U1606405; the National Basic Research Program (973 Program) of China under contract No. 2011CB403502; the National High Technology Research and Development Program (863 Program) of China under contract No. 2013AA09A506; the National Program on Global Change and Air-Sea Interaction under contract Nos GASI-IPOVAI-01-02 and GASI-03-01-01-04; the National Natural Science Foundation of China under contract No. 41606040. |
| Author Name | Affiliation | E-mail | | ZHU Yaohua | Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | | | SUN Junchuan | Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | | | WEI Zexun | Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | weizx@fio.org.cn | | WANG Yonggang | Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | | | FANG Guohong | Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | | | QU Tangdong | Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles 90095, USA | |
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| Abstract: |
| On the basis of the latest version of a U.S. Navy generalized digital environment model (GDEM-V3.0) and World Ocean Atlas (WOA13), the hydraulic theory is revisited and applied to the Luzon Strait, providing a fresh look at the deepwater overflow there. The result reveals that:(1) the persistent density difference between two sides of the Luzon Strait sustains an all year round deepwater overflow from the western Pacific to the South China Sea (SCS); (2) the seasonal variability of the deepwater overflow is influenced not only by changes in the density difference between two sides of the Luzon Strait, but also by changes in its upstream layer thickness; (3) the deepwater overflow in the Luzon Strait shows a weak semiannual variability; (4) the seasonal mean circulation pattern in the SCS deep basin does not synchronously respond to the seasonality of the deepwater overflow in the Luzon Strait. Moreover, the deepwater overflow reaches its seasonal maximum in December (based on GDEM-V3.0) or in fall (October-December, based on the WOA13), accompanied by the lowest temperature of the year on the Pacific side of the Luzon Strait. The seasonal variability of the deepwater overflow is consistent with the existing longest (3.5 a) continuous observation along the major deepwater passage of the Luzon Strait. |
| 中文摘要: |
| 基于最新的GDEM3.0月平均和WOA13季节平均资料，我们将水力学理论应用到吕宋海峡，得到了对吕宋深水瀑布规律的新认识。结果表明：（1）吕宋海峡两侧的密度差是维持常年深水瀑布的动力，（2）深水瀑布的季节性变化不仅受吕宋海峡两侧密度差的影响，还受深水瀑布上游厚度变化的影响，（3）吕宋海峡深水瀑布呈弱半年周期性变化，（4）南海深层平均环流结构不会对吕宋海峡深水瀑布的变化作季节内响应。此外，根据GDEM3.0月平均资料和WOA13季节平均资料，深水瀑布流量分别是12月达到最大和秋季（10-12月）达到最大，同时伴随吕宋海峡北太平洋侧的季节性最低温度。本文所得的深水瀑布季节性变化与在吕宋海峡3.5年现场观测结果的季节性一致。 |
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