基于Argo数据的吕宋海峡东部海域的会聚区特征分析  

Analysis the characteristics of convergence zone in the east of Luzon Strait based on Argo data

作　　者：阮海林[1] 杨燕明[1] 牛富强[1] 文洪涛[1] 

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《海洋学报》2015年第7期78-84,共7页

基　　金：国家海洋局第三海洋研究所基本科研业务费专项资助项目(海三科2011008;海三科2014018)

摘　　要：利用2010-2013年的Argo浮标观测资料,对吕宋海峡东部海域（19°-23°N,123-127°E）的会聚区特征进行综合分析。研究结果如下：（1）吕宋海峡东部海域4个季节表面的声速从大至小依次为夏季、秋季、春季和冬季,夏季最大为1 543.5m/s,冬季最小为1 533.4m/s;混合层深度从大到小依次为冬季、秋季、春季和夏季;（2）采用WOA13气候态数据对声速剖面进行深海延拓,获得全海深的声速剖面,分析4个季节的声道特征。声道轴深度和声速较为稳定,声道轴深度在1 000-1 040m之间,声道轴处的声速为1 482m/s,4个季节的平均声道厚度都超过4 500m,利于会聚区形成;（3）研究区较易发生会聚现象,发生会聚现象概率高于50%的占70.6%;会聚现象的发生概率季节变化明显,春季、冬季极易发生声场的会聚现象,夏季最小;（4）运用RAMGeo声场模型对研究区4个季节的声传播损失进行仿真,分析会聚区的季节变化特征。当声源深度100m,接收深度10m时,第一会聚区,离声源的距离在61-64km左右,夏季离声源最近,春、冬季较远;会聚区宽度上,夏季最宽为10km,春季最窄为4.6km;会聚区增益分布特点与会聚区宽度刚好相反,春季最大为14.6dB,夏季最小为8.5dB。Argo data from 2010 to 2013was used to analyze the convergence zones features in the east of Luzon strait（19°-23°N,123°-127°E）.The results as shows：（1）The acoustic velocity near ocean surface in seasons were ranked from large to small：summer,autumn,spring and winter.The maximum acoustic velocity is 1 543.5m/s in summer while the minimum is 1 533.4m/s in winter.The mixed layer depth in seasons were ordered from large to small as followed：winter,autumn,spring and summer.（2）The WOA13 climatological data was used to prolong the sound velocity profiles to seafloor.Analysis the features of sound channel in seasons.The depth and sound velocity of sound channel axis were stabilized.The depth was in 1 000 to 1 040 m,the sound velocity of sound channel axis is 1 482m/s.The length of sound channel more than 4 500 min all four seasons,it was beneficial to formed convergence zone.（3）The study area formed convergence zone surely,the probability which is more than 50%accounted for 70.6%.The occurrence probability of convergence zone was seasonal variation significantly,spring and winter is more likely to formed,summer is least.（4）The RAMGeo acoustic forecast model was used to simulate the four seasonsacoustic transmission loss in the east of Luzon strait,obtained the seasonal variation of the convergence zone in the study area.While the source depth is 100 m,the receiver depth is 10m：the first convergence zone,the distance from sound source is 61 to 64km,the nearest distance is in summer,while the farther is in spring and winter.The convergence-wide,the maximum is 10 km in summer,while the minimum is 4.6km in spring.The distribution of convergence-gains is opposite with convergence-wide in seasons,the strongest is 14.6dB in spring,while the least is 8.5dB in summer.

关 键 词：吕宋海峡 东部海域 会聚区 声速剖面 季节变化 

分 类 号：P733.2[天文地球—物理海洋学]