SWERUS-C3 Expedition EK80 sonar data, Eastern Siberian Arctic margin, October 1 - 2, 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.本贡献数据集为2014年SWERUS-C3科考航次第二航段（瑞典-俄罗斯-美国北极气候-冰冻圈-碳相互作用考察，Swedish-Russian-US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions）期间，在破冰船“奥登号”（Icebreaker Oden）上，搭载Simrad ES18-11科学分裂波束回声测深仪，并通过Simrad EK80宽带收发机（Wide-band Transceiver, WBT）采集得到的水体后向散射数据。该EK80宽带收发机由UNH专为本次科考项目安装于“奥登号”破冰船上。本次采集数据的工作频段覆盖约16至29 kHz，可生成极高分辨率的水体影像，借此能够清晰区分甲烷气渗漏点处的单个气泡，以及水体中包含温盐阶跃结构（thermohaline steps）在内的各类精细尺度结构。数据集文件采用如下命名格式："ODEN-{Date}-{Time}.raw"。其中“ODEN”表明数据采集自“奥登号”破冰船；{Date}对应该24小时测量周期的结束日期；{Time}为测量周期启动后流逝的时、分、秒，格式为HHMMSS。例如，"ODEN-D20140903-T192153.raw" 包含的是“奥登号”破冰船在2014年9月3日测量周期启动后19时21分53秒记录的观测数据。