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第30卷第3期 天津科技大学学报 Journal of Tianjin University of Science&Technology Vb1.30 No.3 2015年6月 Jun.2O15 DOI:0.3364/j.ssn.672—6510.20140115 官 古海峡典型断面水文特征分析 (1.天津科技大学海洋科学与工程学院,天津 ,300457;2.中国科学院海洋研究所,青岛266071) 王耀环 ,汪嘉宁 李家星 ,魏 皓 要:宫古海峡是连接东海与太平洋的重要水道,其水文要素变化与两者交换密切相关.文中基于海洋再分析数据 集JCOPE2(Japan Coasal Ocean Predictabiy Experment 2)的温度和盐度模拟结果,分析了宫古海峡典型断面(KR 断面)温度、盐度、密度垂向分布的变化特征,讨论了密度跃层的季节分布和年际变化.结果表明:(1)KR断面温度在 表层大于22℃并随深度降低,l 000 m左右温度为4℃;盐度(s)在次表层(100~200 m)达到最大(S>34.85),在中层 500~800 m)最小(S>34.30);表层密度低于22 kg/m0,随深度逐渐增加,1 000 m左右密度大于27 kg/m。.等密线与等 温线分布基本一致,两者在黑潮核 2区向下倾斜.(2)KR断面温跃层在126。E以东外海区季节变化分为4个阶段,分 别为无跃期(—4月)、成长期(5—6月)、强盛期(7—9月)和消衰期(10—12月),盐跃层则只存在于7—9月的陆坡处 且厚度较薄,密度跃层变化与温跃层一致.(3)密度跃层的分布主要受控于温度,仅在126。E附近近表层海域受盐度影 响.100m以浅的海洋密度跃层总时间变化(年际变化与季节变化之和)明显大于中深层,而且黑潮流核处总时间变化 明显小于其两侧.水体不同深度的密度跃层主要时间变化机制存在差异,200m以浅季节变化显著,200m以深年际变 化显著. 关键词:宫古海峡;水文特征;密度跃层;季节和年际变化 中图分类号:P73 1_ 文献标志码:A 文章编号:1672—65 0(2015)03—0050—07 Hydrologic Characteristics at the Typical Section of the Miyako Strait WANGYaohuan ,WANG Jianing2LI Jiaxing ,WEI Hao (1.Colege of Marne Science and Engineerng,Tianjn Universiy of Science&Technology,Tianjn 300457,China; 2.Insut of Oceanology,Chines Academy of Scinces,Qingdao 26607 1,China) Abstract ̄The Miyako Strait is an important waterway between the East China Sea and the Pacifc Ocean.Its hydrologic charactrics at he pical secton(KR secon)ar related o he water exchange beween the Eas China Sea and he Pa— cic Ocean.The temporal and spatial variations of temperature,salinity and density are studied through analyzing the JCOPE2(Japan Coastal Ocean Predictabili Experiments 2)dataset.The seasonal and interannual variations of the pycno— cline are examined.The conclusions are summarized as follows.(1)Temperature decreases wih depth,from more than 22℃ on the surface to 4℃at 1 000 m.The maximum and minimum salnity in vercal profe is 1ocated on the subsurface(1 00— 200 m)and at intermediate depths of 500—800 m.Density increases with depth,from less than 22 kg/m on the surface to 27 kg/m at 1 000 m.The longidinal-depth variations of isopycnals and isothermals follow each other and they both show a depression around he Kuroshio.(2)Beyond 1 26。E,he development of heroclne undergoes a easonal ycl of unsra ed,growing,strong and decaying periods.Halocline only appears fom July to September in the slope and i is thin.The pycnocline has the same temporal and spatial variations as the thermocline.(3)The pycnocline is mainly controled by ter perature.except on the surface around 126。E where salnity becomes more important than temperature in determining strati— cation.The total variability(interannual variance and seasonal variance)of squared buoyance fequency is large at the depth less than 1 00 m and smal at the depth more than 1 00 m.Partitioning of variabilit between seasonal and interannual scales shows the predominance of nterannual variability is at the depth more than 200 m and seasonal variabiliy at the depth less 收稿日期:2014—09—01;修回日期:2014—10—30 基金项目:国家重点基础研究发展计划(73计划)资助项目(2011CB403606);国家自然科学基金资助项目(41376112) 作者简介:王耀环(1988一),女,内蒙古赤峰人,硕士研究生;通信作者:魏皓,教授,weihao@oacdu.n. 






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