Biological Oceanographic Reconnaissance of the Arafura Sea

24 sampling stations in Arafura Sea were occupied during Cruise 5451 to study pelagic metabolism and primary production.Observations included: Six 14C production experiments; Five oxygen based P:R experiments; Sixteen replicated (3) zooplankton stations with 100 and 330um nets, including two 24h time series (WES002-007 and WES015-018); Continuous thermosalinograph measurements along the ship's track; Continuous measurement of remote sensing reflectance using the DALEC; Four cross calibrations of DALEC data with Tricho-Cam imagery.CTD transects recorded depth, pressure, temperature, salinity, density fluorescence, PAR, surface light, beam transfer, oxygen measurements.Plankton and larval fish sampling was conducted using a conducted using the bongo net fitted with a Laser Optical Plankton Counter (LOPC) which counted particles in size bins between 100µm and 2mm in equivalent spherical diameter (ESD). Depth-integrated bongo net sampling allowed the characterisation of fish larvae assembles and distribution. Water column structure, relative fluorescence and respiration rate and net community productions were analysed for hydrographic, chlorophyll and nutrient profiles for several locations.59 species of copepods were identified in the region. Data is aggregated in a Microsoft Access Database

本研究依托5451号科考航次，在阿拉弗拉海（Arafura Sea）布设24个采样站位，旨在探究远洋代谢与初级生产力。本次观测内容包括：6组14C标记初级生产力实验；5组基于溶氧的生产力与呼吸比（P:R）实验；16个浮游动物采样站位（每个站位设置3次重复），采用100μm与330μm孔径的网具开展采样，其中包含2组24小时时间序列采样站位（WES002-007与WES015-018）；沿科考航迹开展连续温盐仪（thermosalinograph）观测；采用DALEC设备开展遥感反射率连续观测；通过Tricho-Cam影像对DALEC观测数据完成4次交叉定标。CTD（Conductivity Temperature Depth，温盐深仪）走航断面观测记录了水深、压强、温度、盐度、密度、荧光强度、光合有效辐射（Photosynthetically Active Radiation, PAR）、表面光照、光束传输系数以及溶氧浓度等参数。浮游生物与仔鱼采样采用装配激光光学浮游生物计数器（Laser Optical Plankton Counter, LOPC）的邦戈网（bongo net）实施，该计数器可对等效球形直径（Equivalent Spherical Diameter, ESD）介于100μm至2mm之间的粒径分级颗粒进行计数。分层积分式邦戈网采样实现了仔鱼群落组成与分布特征的表征。针对多个站位的水柱结构、相对荧光强度、呼吸速率以及净群落生产力进行分析，并同步获取了水文、叶绿素与营养盐剖面数据。本区域共鉴定出59种桡足类动物。所有数据均汇总存储于微软Access（Microsoft Access）数据库中。