SWERUS-C3 Expedition EK80 sonar data, Eastern Siberian Arctic margin, August 28 - 30, 2014

The contributed data represents watercolumn backscatter data collected with a Simrad EK80 Wide-band Transceiver (WBT) transmitting through a Simrad ES18-11 scientific split-beam echosounder on the Icebreaker Oden during Leg 2 of the SWERUS-C3 2014 expedition (Swedish-Russian-US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions). The EK80 WBT was installed by UNH on the Oden especially for this program. The data were collected over a band of approximately 16 - 29 kHz providing extremely high resolution imagery of the water column that has allowed us to distinguish individual bubbles at methane gas seeps and fine-scale structure, including thermohaline steps, in the water column. Files are named according to the format: ODEN-{Date}-{Time}.raw. "ODEN" indicates that the measurements were taken on the Icebreaker Oden. {Date} corresponds to the date that this 24-hour cycle of measurements concluded and {Time} is the number of hours, minutes, and seconds (in this format: HHMMSS) since this cycle of measurements began. For example, "ODEN-D20140903-T192153.raw" contains data recorded from the Icebreaker Oden taken during the 2014-09-03 cycle 19:21:53 after the cycle began.

本数据集为水体后向散射数据（watercolumn backscatter data），采集于2014年SWERUS-C3科考航次（瑞典-俄罗斯-美国北冰洋气候-冰冻圈-碳相互作用调查，Swedish-Russian-US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions）第二航段，搭载于“奥登”号破冰船（Icebreaker Oden）的Simrad ES18-11科学分裂波束回声测深仪（split-beam echosounder），通过Simrad EK80宽带收发器（WBT）发射信号完成采集。
本套EK80宽带收发器由新罕布什尔大学（UNH）专为本次科考项目安装于“奥登”号破冰船。
本次数据采集所用频段约为16~29 kHz，可生成极高分辨率的水体成像，使研究人员得以区分甲烷渗漏点处的单个气泡，以及水体中包括温盐阶梯结构（thermohaline steps）在内的精细尺度结构。
数据文件命名格式为：ODEN-{Date}-{Time}.raw。其中"ODEN"代表观测数据采集自“奥登”号破冰船；{Date}对应本次24小时测量周期的结束日期；{Time}为该测量周期启动后流逝的时、分、秒（格式为HHMMSS）。示例："ODEN-D20140903-T192153.raw"包含2014年9月3日测量周期启动后，于当日19时21分53秒采集的“奥登”号破冰船观测数据。