Total Sky Imager observations during POLARSTERN cruise PS122/3 on 2020-05-25@en

The dataset consist of camera shots of the sky. The camera - a total sky imager manufactured by Canon (Powershot) - was mounted at the top of the Research Vessel Polarstern. At the leg 3 (from February until June 2020) of the MOSAIC experiment from Arctic Ocean - Longyearbyen this camera shots were taken with a temporal resolution between 15 minutes and 15 seconds. The dataset represents the visible projection of weather conditions and cloud cover recorded on the vessel Polarstern in the direction near the zenith. These observations are useful for the interpretation of the atmospheric radiation measurements.本数据集包含天空的相机拍摄影像。该相机为佳能（Canon）Powershot系列生产的全天空成像仪（total sky imager），安装于极星号（Polarstern）科考研究船的船顶部位。本次拍摄工作开展于北冰洋MOSAIC实验的第三航段，该航段于2020年2月至6月执行，航线起点为朗伊尔城（Longyearbyen），拍摄的时间分辨率介于15秒至15分钟之间。本数据集记录了极星号科考研究船在近似天顶（zenith）方向上观测到的天气状况与云覆盖情况的可见光影像。此类观测数据可用于辅助解读大气辐射测量结果。