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      Circulation and Heat Flux along the Western Boundary of the North Pacific

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          Abstract

          On the basis of the conductivity temperature depth (CTD) observation data off the coast of the Philippines (7.5°–18°N, 130°E–the east coast of the Philippines) in the fall of 2005, the water mass distribution, geostrophic flow field, and heat budget areexamined. Four water masses are present: the North Pacific Tropical Surface Water, the North Pacific Sub-surface Water, the North Pacific Intermediate Water, and the Antarctic Intermediate Water (AAIW). The previous three corresponded with the North Equatorial Current (NEC), the Kuroshio Current (KC), and the Mindanao Current (MC), respectively. AAIW is the source of the Mindanao Undercurrent. The mass transport of NEC, KC, and MC is 58.7, 15, and 27.95 Sv, respectively (relative to 1500 db). NEC can be balanced by the transport across the whole transect 18°N (31.81 Sv) and 7.5°N (26.11 Sv) but not simply by KC and MC. Direct calculation is used to study the heat flux. In sum, 1.45 PW heat is transported outwards the observed region, which is much more than that released from the ocean to the air at the surface (0.05 PW). The net heat lost decreased the water temperature by 0.75°C each month on average, and the trend agreed well with the SST change. Vertically, the heat transported by the currents is mainly completed in the upper 500 m.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          20 December 2019
          01 February 2020
          : 19
          : 1
          : 1-12
          Affiliations
          1College of Ocean and Atmosphere Sciences, Ocean University of China, Qingdao 266100, China
          2The First Institute of Oceanography, MNR, Qingdao 266061, China
          3Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao 266061, China
          4Laboratory for Ocean and Climate Dynamics, Pilot National Laboratory for Marine Science and Technology, Qingdao 266100, China
          Author notes
          *Corresponding author. MA Chao, E-mail: machao@ 123456ouc.edu.cn
          Article
          s11802-019-4168-z
          10.1007/s11802-019-4168-z
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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