LATITUDINAL VARIATION OF DEEP SCATTERING LAYER IN THE WESTERN PACIFIC  

作　　者：LUELian-gang, QIAOFang-li YUANYe-li 

机构地区：[1]KeyLaboratoryofMarineScienceandNumericalModeling,TheFirstInstituteofOceanography,StateOceanicAdministration,Qingdao266061,China

出　　处：《Journal of Hydrodynamics》2004年第5期571-581,共11页水动力学研究与进展B辑（英文版）

基　　金：NationalKeyBasicResearchandDevelopmentProgram (GrantNo :19990 4 3811)andYouthScienceFoundationofStateOceanicAdministration (GrantNo :G2 0 0 340 3)

摘　　要：The acoustic Echo Intensity (EI) was recorded with 38k shipborne AcousticDoppler Current Profiler (AD-CP) in the Western Pacific in four cruises between Sept. 2001 and Oct.2002. The main Deep Scattering Layer (DSL) was observed at 400m-600 m depth in the four cruises. Thelatitudinal variation of the main DSL, which has high level of back-scatter strength (BS) at highlatitude, is prominent during both nighttime and daytime. The influences of environmental conditionson the DSL are discussed. Since high-oxygen water in the north is a friendly environment of marineanimals which form the main DSL, more animals are expected to aggregate in the 400dbars-600dbarslayer in the north. Dissolved Oxygen (DO) is the principal factor that causes the main DSL to varywith latitude, and its spatial distributions result from formation and transport of North PacificIntermediate Water (NPIW).The acoustic Echo Intensity (EI) was recorded with 38k shipborne AcousticDoppler Current Profiler (AD-CP) in the Western Pacific in four cruises between Sept. 2001 and Oct.2002. The main Deep Scattering Layer (DSL) was observed at 400m-600 m depth in the four cruises. Thelatitudinal variation of the main DSL, which has high level of back-scatter strength (BS) at highlatitude, is prominent during both nighttime and daytime. The influences of environmental conditionson the DSL are discussed. Since high-oxygen water in the north is a friendly environment of marineanimals which form the main DSL, more animals are expected to aggregate in the 400dbars-600dbarslayer in the north. Dissolved Oxygen (DO) is the principal factor that causes the main DSL to varywith latitude, and its spatial distributions result from formation and transport of North PacificIntermediate Water (NPIW).

关 键 词：deep scattering layer latitudinal variation north pacific intermediatewater (NPIW) acoustic doppler current profiler (ADCP) dissolved oxygen 

分 类 号：P733.21[天文地球—物理海洋学]