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    LI Li,GAN Zijun. 2014. Ventilation of the Sulu Sea retrieved from historical data. Acta Oceanologica Sinica, 33(9):1-11
    Ventilation of the Sulu Sea retrieved from historical data
    Received:April 08, 2014  Revised:May 28, 2014
    Key words:Sulu Sea  ventilation  overflow  interbasin exchange
    中文關鍵詞:  蘇祿海  通風  海水更新過程  溢流  盆間交換
    基金項目:The Chinese Ministry of Science and Technology through the National Basic Research Program under contract No. 2009CB421205.
    Author NameAffiliationE-mail
    LI Li Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China lili@tiosoa.cn 
    GAN Zijun State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanoglogy, Chinese Academy of Sciences, Guangzhou 510301, China  
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          Based on historical observations, ventilation of the Sulu Sea (SS) is investigated and, its interbasin exchange is also partly discussed. The results suggest that near the surface the water renewal process not only occurs through the Mindoro Strait (MS) and the Sibutu Passage, but also depends on the inflows through the Surigao Strait and the Bohol Sea from the Pacific and through the Balabac Strait from the South China Sea (SCS). Both inflows are likely persistent year round and their transports might not be negligible. Below the surface, the core layer of the Subtropical Lower Water (SLW) lies at about 200 m, which enters the SS through the Mindoro Strait not hampered by topography. Moreover, there is no indication of SLW inflow through the Sibutu Passage even though the channel is deep enough to allow its passage. The most significant ventilation process of the SS takes place in depths from 200 m to about 1 200 m where intermediate convection driven by quasi-steady inflows through the Mindoro and Panay straits (MS-PS) dominates. Since the invaded water is drawn from the upper part of the North Pacific Intermediate Water (NPIW) of the SCS, it is normally not dense enough to sink to the bottom. Hence, the convective process generally can only reach some intermediate depths resulting in a layer of weak salinity minimum (about 34.45). Below that layer, there is the Sulu Sea Deep Water (SSDW) homogeneously distributed from 1 200 m down to the sea floor, of which the salinity is only a bit higher (about 34.46) above the minimum. Observational evidence shows that hydrographic conditions near the entrance of the MS in the SCS vary significantly from season to season, which make it possible to provide the MS-PS overflow with denser water of higher salinity sporadically. It is hence proposed that the SSDW is derived from intermittent deep convection resulted from property changes of the MS-PS inflow.
          根據歷史觀測研究了蘇祿海的“通風”(ventilation)過程,并論及其盆間交換。其結果表明在近表層,蘇祿海的海水更新過程不僅經由民都洛海峽和錫布圖海峽發生,而且有賴于太平洋經蘇里高海峽和保和海入流和南海經巴拉巴可海峽的入流。這兩支入流似乎終年持續,其輸運恐難以忽略。在表層下方,副熱帶次表層水(SLW)的核心層位于約200 m處,可經民都洛海峽不受地形阻擋地進入蘇祿海。另一方面,盡管深度足以令其通過,并無SLW經錫布圖海峽流入的跡象。蘇祿海最值得注意的通風過程是發生在200 m至大約1200 m間的中深度對流。該對流系民都洛-班乃海峽準穩態入流所驅動,并受其支配。由于侵入的水體來自南海之北太平洋中層水(NPIW)的上部,它的密度通常不足以使之沉到海底。因此,其對流過程一般僅及某一中間深度,導致一不起眼的鹽度極小值層(約34.45)。在該層之下(從1200 m直至海底)則是均一的蘇祿海深層水(SSDW),其鹽度僅略高于極小值(約34.46)。有觀測證據顯示,在民都洛的入口附近,南海的水文條件季節差異顯著,使之有些時候會提供給民都洛-班乃海峽入流以密度較高的海水。因此推測,SSDW乃來自民都洛-班乃海峽入流水體性質變化所導致的間歇性深對流。
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