后向散射强度与温跃层关系研究  

Study on the Relationship Between BackscatterStrength and Thermocline

作　　者：吕连港[1] 乔方利[1] 葛人峰[1] 卢燕[1] 刘建军[1] 

机构地区：[1]海洋环境科学和数值模拟国家海洋局重点实验室

出　　处：《海洋科学进展》2003年第4期465-470,共6页Advances in Marine Science

基　　金：国家重点基础研究发展规划项目--中国近海环流形成变异机理;数值预测方法和对环境影响的研究 (G1 9990 43 80 9);国家自然科学基金项目--河口;海湾海浪谱反演模型及波谱对颗粒物的搅拌作用(40206003)

摘　　要：2003年8月12-13日,用300kHz的坐底式声学多普勒海流剖面仪(ADCP)在台湾海峡北部海区进行了观测。根据回声强度计算得到的后向散射强度具有明显的日变化,这是浮游动物的垂直迁移造成的。此外,后向散射强度还与叶绿素、浊度和温度梯度有关,其中叶绿素、浊度和温度梯度对后向散射强度的贡献分别是1.41,7.73和3.54dB。温度梯度最大值的深度与后向散射强度第一个峰值的深度一致,故根据后向散射强度能推断出温跃层的位置。A bottom-mounted 300 kHz acoustic Doppler current profiler (ADCP) was used to make measurements in the northern Taiwan Strait sea area from August 12 to 13, 2003. It is shown from the observed data that the backscatter strength has an obvious diurnal variation, and the diurnal variation is caused by the diel migration of zooplankton. The backscatter strength is also related with chlorophyll, turbidity and thermal gradient, and the contributions of chlorophyll, turbidity and thermal gradient to backscatter strength are 1.41 dB, 7.73 dB and 3.54 dB, respectively. The maximum thermal gradient depth is consistent with the first peak backscatter strength depth, so the thermocline position can be deduced by the backscatter strength.

关 键 词：ADCP 温跃层 后向散射强度 

分 类 号：P731.24[天文地球—海洋科学]