Surface brightness temperature images measured by an infrared camera installed on RV POLARSTERN during expedition PS131 (ATWAICE) (June - August 2022, Fram Strait/East Greenland)@en

During the Polarstern cruise PS131 infrared (IR) brightness temperatures of the surface (open ocean and sea ice) were recorded from onboard the vessel with a down-looking infrared camera (Infrared VarioCAM HDx head camera from InfraTec) that was installed on starboard on the upper deck (at around 21.5 m from sea level ('Peildeck')). The viewing angle (off-nadir) was around 70° and the camera has a field of view of 57.1° × 44.4°. Each image has a size of 640 × 480 IR pixels. The images are stored as netCDF files where one file includes data from one day. For each image, latitude and longitude information are included. They are obtained from the mastertrack of the ship (doi:10.1594/PANGAEA.950999). In addition the dataset contains the viewing angle for each image obtained from an auxiliary inertial measurement unit (IMU) installed on the IR camera that was resampled to 2 seconds. Missing data of the IMU was filled by the average of the existing angle measurements of the respective day or, if that was not available, by a fill-value of 70°. […]在极星号（Polarstern）科考航次PS131期间，科研人员利用搭载于科考船的朝下式红外相机（InfraTec公司生产的Infrared VarioCAM HDx head相机）记录了海面（开阔洋面与海冰）的红外（infrared, IR）亮温。该相机安装于右舷上层甲板，位置距海平面约21.5米的‘Peildeck’处，其离天底观测角约为70°，视场角为57.1°×44.4°，单幅图像包含640×480个红外像素。所有图像以netCDF格式存储，每个文件包含单日的观测数据。每幅图像均附带纬度与经度信息，这些坐标数据源自科考船的主航迹记录（doi:10.1594/PANGAEA.950999）。此外，本数据集还包含由安装在红外相机上的辅助惯性测量单元（inertial measurement unit, IMU）获取的各图像观测角数据，该数据已重采样至2秒间隔。惯性测量单元的缺失数据通过当日有效角度测量值的平均值填补；若当日无有效测量数据，则采用填充值70°。[…]