摘要
利用第八次北极调查走航ADCP后向散射强度数据,结合太阳高度、海冰密集度和实测水体环境参数数据,统计分析了中高纬海洋声散射层的时空变化特征。结果表明,纬度越高,声散射层在海表滞留时间越短,即使在极昼期间及全海冰覆盖海域,虽然其迁移幅度和后向散射强度减弱,但仍受太阳高度变化影响,且二者具有较强的时序相关性;在北极中央海域,不仅声散射层迁移活动较弱,且出现无明显散射层的情况,可能是因为该海域浮游动物和鱼类聚集度相对较低且迁移活动微弱,超出了本文所用ADCP的探测精度范围;从鄂霍次克海至白令海西南海域,往返ADCP数据均显示有两个后向散射强度上高下低,但垂直迁移时间同步的声散射层,且二者间距随纬度增加而逐渐减小并合为一体,这可能是由不同生活习性的海洋生物造成的。
The shipboard ADCP (Acoustic Doppler Current Profilers) backscatter intensity data in the Eighth Arctic Science Expedition are analyzed for the temporal and spatial characteristics of the sound scattering layer (SSL), by combining the solar altitude, the sea ice concentration and the in-situ data of the water environment parameters. The results show that the higher the latitude is, the shorter the time of the SSL is on the sea surface. Even during the period of polar day and all covered by sea ice, the migration amplitude and backscattering intensity of the SSL are weakened, but they are still affected by the change of the solar elevation, and there is a strong temporal correlation between them and solar altitude angle. In the middle section of the Arctic, the migration of the SSL is weak, and there is no obvious SSL observed, the reason may be that the concentration of zooplanktons and fishes are relatively lower and the migration is weak, which is beyond the accuracy range of ADCP used in this paper. ADCP data in the back and forth from the Okhotsk Sea to the southwest of the Bering Sea, show that there are two SSLs, the shallower depth and the greater backscatter intensity, but their vertical migration time is synchronized, and the spacing between them is gradually reduced and combined as the latitude increases, it may be caused by marine organisms with different life habit.
作者
黄二辉
杨燕明
文洪涛
周鸿涛
Huang Erhui;Yang Yanming;Wen Hongtao;Zhou Hongtao(Ocean Acoustic and Remote Sensing Laboratory, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2019年第7期52-64,共13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金项目(海三科2017022)
国家重点研发计划(2018YFC1405900)
关键词
中高纬
声散射层
太阳高度角
后向散射强度
垂直迁移
middle and high latitudes
sound scattering layer
solar altitude angle
backscatter intensity
vertical migration
