Echosounder, lipid, material property, and target strength data for krill (Euphausiids) from the Bering Sea and Gulf of Alaska in 2016 and 2017

This dataset consists of echosounder, lipid, material property, and target strength data for krill (Euphausiids) from the Bering Sea and Gulf of Alaska in 2016 and 2017. Oscar Dyson Cruise Echosounder data. Included in this dataset are backscatter data at multiple frequencies collected by Simrad EK60 echosounders during NOAA AFSC pollock assessment cruises in the Bering Sea in 2016 and the Gulf of Alaska in 2017. Additionally, lipid data from frozen krill specimens collected during the cruises were collected by analyzing the amount and type of different lipids in the specimens by Dr. Rodger Harvey (Old Dominion Univ.). Individual krill had their morphology (length and shape) and material properties (density (g) and soundspeed (h) contrast with seawater) measured while at sea. These animals also were tethered in an experimental aquaria and their backscatter (Target Strength) was collected at different acoustic frequencies. These empirical TS measurements were compared with those from theoretical TS models. The data are organized into three .zip files. krill_lipid_analysis.zip contains an excel file that details the specific results from lipid analysis performed on krill samples, including the lipid molecule name, the specific class each lipid comes from, the fatty acid make up of each lipid, and the calculated mass of the lipid molecule based on mass spectrum measured. krill_material_property_and_TS_summary_data.zip contains subfolders (animal_shapes, g_measurement, h_measurement, stereocamera, ts_measurement, and ts_model) with summary data files for the various measurements that were made on individual krill collected during cruises on the Oscar Dyson in 2016 and 2017 in the eastern Bering Sea and Gulf of Alaska respectively. There are readme files in each subfolder providing more detail. oscar_dyson_echosounder.zip contains two word documents detailing raw data collected from both surveys conducted. This data was collected as part of NPRB project 1501.本数据集收录了2016至2017年白令海与阿拉斯加湾海域磷虾（Euphausiids）的回声探测、脂质、物质属性及目标强度数据，相关数据源自奥斯卡·戴森号（Oscar Dyson）科考航次的回声探测成果。本数据集包含2016年白令海、2017年阿拉斯加湾美国国家海洋和大气管理局阿拉斯加渔业科学中心（NOAA AFSC）狭鳕评估科考航次中，由西姆拉德EK60（Simrad EK60）回声探测仪采集的多频后向散射数据。此外，科考航次中采集的冷冻磷虾标本的脂质数据，由罗德格·哈维博士（欧道明大学，Old Dominion University）通过分析标本内各类脂质的含量与种类完成测定。科考期间，研究人员对单只磷虾的形态特征（体长与体型）及物质属性（与海水相比的密度（g）和声速（h）对比度）进行了测量；同时将这些磷虾拴系于实验水族箱中，采集不同声学频率下的后向散射（目标强度（Target Strength，TS））数据，并将这些实测TS结果与理论TS模型的计算结果进行了对比。本数据集以三个.zip压缩包形式组织：krill_lipid_analysis.zip内含一份Excel文件，详细记录了磷虾样本脂质分析的具体结果，包括脂质分子名称、所属脂质类别、各脂质的脂肪酸组成，以及基于质谱测量结果计算得到的脂质分子质量；krill_material_property_and_TS_summary_data.zip包含animal_shapes、g_measurement、h_measurement、stereocamera、ts_measurement、ts_model六个子文件夹，存放了2016年东白令海、2017年阿拉斯加湾奥斯卡·戴森号科考航次中采集的单只磷虾各项测量数据的汇总文件，每个子文件夹内均配有readme文件以提供更多细节；oscar_dyson_echosounder.zip包含两份Word文档，详细记录了两次科考航次采集的原始数据。本数据集作为北太平洋研究委员会（NPRB）项目1501的一部分完成采集。