SWERUS-C3 Expedition EK80 sonar testing and calibration data, Eastern Siberian Arctic margin, August 19 - 21, 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.

本数据集所提供的数据，为2014年SWERUS-C3科考航次（瑞典-俄罗斯-美国北极气候-冰冻圈-碳相互作用调查）第2航段期间，于奥登号破冰船上，由Simrad EK80宽带收发机（Wide-band Transceiver, WBT）配合Simrad ES18-11型科学分裂波束回声测深仪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。本次数据采集覆盖约16~29 kHz的频段，可生成极高分辨率的水体成像，能够分辨甲烷气渗漏区的单个气泡，以及水体中包含温盐阶梯结构在内的精细尺度构造。数据文件命名遵循如下格式：ODEN-{Date}-{Time}.raw。其中“ODEN”代表本次测量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}为该测量周期启动后所历经的时分秒（格式为HHMMSS）。例如，"ODEN-D20140903-T192153.raw"包含2014年9月3日测量周期内，自该周期起始后19时21分53秒所记录的奥登号破冰船测量数据。