Data from AUV Ran missions during Nathaniel B. Palmer cruise NBP2202

Files CTD_NBP2202_***.txt Post processed data from the SeaBird sensor packages. Data fields: Time (Matlab time) - Time (UTC) as serial date number in Matlab convention (where 01-Jan-1900 00:00:00 is 693962.0) Pressure (dBar) Latitude Longitude Absolute Salinity (g/kg) calculated according to http://www.teos-10.org Conservative temperature (degrees) calculated according to http://www.teos-10.org Dissolved Oxygen (ml/l) Meltwater Fraction (dimensionless), calculated according to Wåhlin et al, 2024 Instrument: Dual packages consisting of one SBE19plus, one SBE43, and one pump (SBE5T) operating simultaneously. The packages had separated tubing systems but with inlets close to each other. The following are the serial numbers of the sensors: Port: SBE19plus, serial number: 19-7869, no SBE43 mounted Starboard: SBE19plus, serial number: 19-7880 and SBE43, serial number: 0081 The SBE43 had the following calibration coefficients: Soc = 0.5418; Voffset = -0.4828; Tau = 1.14; A = -4.1263e-003; B = 1.3268e-004; C = -2.1621e-006; Enom = 0.036; Post processing: The following post processing was done to the raw data: 1) General check of data, removal of data while the vehicle was still in air. The pump for the port sensor had a bad cable. Since there was no growing offset we discarded all port data and only post processed the starboard data. 2) Spike removal using the following low pass filter: [b,a] = butter(5,0.1,'low'); The following were the spike size limits: Temperature: 0.1; Salinity 0.01 and dissolved oxygen: 0.1. 3) Bin average to 1 Hz from the 4 Hz raw data 4) Offset adjustment based on the post-cruise calibrated ship CTD data (https://www.usap-dc.org/view/project/p0010249). These offsets were +0.026 mS/cm for conductivity, +0.0002 oC for temperature, and 0.22 ml/l for dissolved oxygen. Files NBP2202_**_10m.txt Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 10 m grid. The data fields are: latitude (decimal degrees), longitude (decimal degrees) ice draft (m) Files NBP2202_**_2m.txt Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 2 m grid. The data fields are latitude (decimal degrees) longitude (decimal degrees) ice draft (m) Files NBP2202_**_1m.txt Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 1 m grid. The data fields are latitude (decimal degrees) longitude (decimal degrees) ice draft (m) File CTD_PostProcessed.txt Temperature, salinity and depth from a SBE49 CTD cast through a hot-water borehole at 74° 22' 12.5328" S, 112° 32' 26.2782" W (74.370062 S, 112.540718 W). A Seabird SBE49 (SN 0219) FastCAT CTD profiler was mounted on a purpose-built deployment frame and attached to a winch cable with a mechanical termination and an electrical termination for live data collection. A downward and upward cast of temperature and salinity with pressure was made at 14:46 UTC on 7 Feb 2022, sampling at a rate of 16 Hz. Data collection took about an hour each way. The CTD spent a couple of minutes at the seabed (1226 dB, recorded by an RBRsolo), which introduced artifacts in the salinity observations during the upcast. The data were filtered, aligned in time, and averaged into 0.05 m vertical bins using the Seabird processing routines version 7.26.7.129. No thermal mass corrections were applied. The data were calibrated with CTD data from the RV/IB Nathaniel B. Palmer and CTD data from the AUV, and conductivity was shifted by +0.015 mS/cm. The manufacturer-stated accuracy of the temperature and conductivity sensors are ±0.002 °C and ±0.0003 S m−1, respectively. Data fields: pressure (dB) Conservative temperature (deg) Absolute salinity (g/kg) File dotson_cast_downcast.cnv Raw data of the drill site CTD Data fields: Pressure (dB) Conductivity (mS/cm) Temperature (in situ, oC) Scan (count) Flag文件CTD_NBP2202_***.txt 该数据集为海鸟（SeaBird）传感器套件的后处理数据。 数据字段包括： 1. 时间（Matlab时间）：采用Matlab约定的序列日期编号表示的协调世界时（UTC）时间（其中1900年1月1日00:00:00对应数值693962.0） 2. 压力（dBar） 3. 纬度 4. 经度 5. 绝对盐度（Absolute Salinity，单位：g/kg），依据http://www.teos-10.org 标准计算得到 6. 保守温度（Conservative temperature，单位：摄氏度），依据http://www.teos-10.org 标准计算得到 7. 溶解氧（Dissolved Oxygen，单位：ml/l） 8. 融水分数（Meltwater Fraction，无量纲），依据Wåhlin等人2024年的研究方法计算得到 仪器配置： 采用双套传感器套件，每套包含1台SBE19plus、1台SBE43以及1台泵（SBE5T），同步运行。两套套件的管路系统相互独立，但进水口位置彼此邻近。 传感器序列号信息如下： 左侧舷（Port）：仅搭载SBE19plus（序列号：19-7869），未安装SBE43传感器 右侧舷（Starboard）：搭载SBE19plus（序列号：19-7880）与SBE43（序列号：0081） 该SBE43传感器的校准系数如下：Soc = 0.5418；Voffset = -0.4828；Tau = 1.14；A = -4.1263e-003；B = 1.3268e-004；C = -2.1621e-006；Enom = 0.036 后处理流程： 原始数据经过如下后处理步骤： 1. 通用数据校验：移除载具仍处于空中时段的无效数据。左侧舷传感器的泵存在电缆故障，由于未出现持续偏移，故丢弃全部左侧舷传感器数据，仅对右侧舷数据进行后处理。 2. 尖峰去除：采用如下低通滤波器进行处理： [b,a] = butter(5,0.1,'low'); 尖峰尺寸限制阈值为：温度0.1、盐度0.01、溶解氧0.1。 3. 分箱平均：将4Hz原始数据重采样为1Hz数据 4. 偏移量校正：依据航后校准的船载CTD（Conductivity Temperature Depth，温盐深剖面仪）数据（https://www.usap-dc.org/view/project/p0010249）进行偏移量调整，其中电导率偏移量为+0.026 mS/cm，温度偏移量为+0.0002 ℃，溶解氧偏移量为0.22 ml/l。 文件NBP2202_**_10m.txt 该数据集为通过序列号为2105的EM2040CX多波束声呐识别得到的冰盖吃水深度（Ice draft，即冰-洋界面深度）。该声呐朝上安装，工作频率为300 kHz。将质量等级高于13的数据导入Eiva Navimodel Producer软件，并以10米为网格分辨率进行网格化处理。数据字段包括： 纬度（十进制度数） 经度（十进制度数） 冰盖吃水深度（单位：米） 文件NBP2202_**_2m.txt 该数据集为通过序列号为2105的EM2040CX多波束声呐识别得到的冰盖吃水深度（Ice draft，即冰-洋界面深度）。该声呐朝上安装，工作频率为300 kHz。将质量等级高于13的数据导入Eiva Navimodel Producer软件，并以2米为网格分辨率进行网格化处理。数据字段包括： 纬度（十进制度数） 经度（十进制度数） 冰盖吃水深度（单位：米） 文件NBP2202_**_1m.txt 该数据集为通过序列号为2105的EM2040CX多波束声呐识别得到的冰盖吃水深度（Ice draft，即冰-洋界面深度）。该声呐朝上安装，工作频率为300 kHz。将质量等级高于13的数据导入Eiva Navimodel Producer软件，并以1米为网格分辨率进行网格化处理。数据字段包括： 纬度（十进制度数） 经度（十进制度数） 冰盖吃水深度（单位：米） 文件CTD_PostProcessed.txt 该数据集为通过热水钻孔获取的SBE49 CTD（Conductivity Temperature Depth，温盐深剖面仪）剖面数据，钻孔位置为南纬74°22′12.5328″、西经112°32′26.2782″（即南纬74.370062°，西经112.540718°）。搭载于专用部署架上的海鸟（SeaBird）SBE49（序列号：0219）FastCAT CTD剖面仪，通过带有机械接头与电接头的绞车电缆连接，可实现实时数据采集。该剖面于2022年2月7日14:46 UTC完成下投与上投过程，采样频率为16 Hz，单程数据采集耗时约1小时。CTD在海底停留约2分钟（深度1226 dB，由RBRsolo记录仪记录），该过程在上投过程中对盐度观测结果引入了伪影。原始数据经滤波、时间对齐后，采用SeaBird处理软件版本7.26.7.129，以0.05米为垂直分箱间隔进行平均处理，未进行热质量校正。数据集采用RV/IB Nathaniel B. Palmer号的CTD数据与自主水下航行器（AUV）的CTD数据进行校准，电导率偏移量调整为+0.015 mS/cm。制造商标注的温度传感器与电导率传感器精度分别为±0.002 ℃与±0.0003 S m−1。 数据字段包括： 压力（dB） 保守温度（Conservative temperature，单位：摄氏度） 绝对盐度（Absolute Salinity，单位：g/kg） 文件dotson_cast_downcast.cnv 该数据集为钻探点位CTD的原始数据 数据字段包括： 压力（dB） 电导率（单位：mS/cm） 原位温度（in situ Temperature，单位：℃） 扫描计数（Scan，单位：count） 质量标记（Flag）