大连湾口处夏秋季节温盐流及混合特征研究  

Study on temperature,salinity,current and mixing in summer and autumn over the mouth of Dalian Bay

作　　者：赵骞[1] 赵云霞[2] 张志锋[1] 韩康[1] 

机构地区：[1]国家海洋环境监测中心,辽宁大连116023 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋环境科学》2014年第5期729-734,共6页Marine Environmental Science

基　　金：国家海洋局908专项(908-02-02-03);国家海洋局近岸海域生态环境重点实验室开放基金(201207)

摘　　要：基于2008年10月14至15日,2009年8月14至15日,20至21日在大连湾口进行的海流、温度和盐度的周日连续观测,对大连湾口处夏季、秋季的温、盐、流及混合特征进行了研究。结果表明,大连湾湾口处的平均混合率较强,约为10-3m2/s;混合率的最大值超过10-2m2/s,比大洋混合率的背景场量值高3个数量级;夏季大潮期的混合率大于小潮期。强混合可归因于以下几个方面:(1)风的机械能是海洋上层混合的一个主要来源;(2)潮致混合是大连湾口处夏季、秋季混合的主要类型;(3)边界层内较强的底摩擦是底层混合的重要贡献因素;(4)剪切不稳定是产生强混合的主要动力机制之一。Based on the continuous observations of temperature, salinity and currents at the mouth of Dalian Bay during Oct. 14 - 15, 2008, Aug. 14 - 15 and 20 - 21, 2009, the characteristics of temperature, salinity, current and mixing in summer and autumn were studied. The results show that the average mixing rate over the mouth of Dalian Bay is relatively strong with the value about 10-3 m^2/s;the maximum mixing rate exceeds10-2 m2/s, which is three orders larger than the value of background field of ocean mixing rate;in summer, the mixing rate in spring tide is greater than that in neap tide. The reasons of strong mixing can be summarized as follows ： （ 1 ） The mechanical energy input by wind is a major source of the upper ocean mixing; （2） Tidal mixing is the main type of mixing over the mouth of Dalian Bay in summer and autumn; （3） The strong bottom friction in boundary layer is an important contributor to the strong-mixing in the bottom layer; （4） Shear instability is one of the main driving forces of the strong-mixing.

关 键 词：大连湾 海流 混合 底摩擦 剪切不稳定 

分 类 号：P731[天文地球—海洋科学]