Cloud occurrence and layering at Arctic atmospheric observatories: Atqasuk, Alaska

This data set contains cloud occurrence and layering data for Atqasuk, Alaska. Cloud occurrence fraction determines the first order impact of clouds on the climate system. This collection of data sets documents cloud occurrence and, to the degree possible, cloud vertical distribution at multiple locations across the Arctic. Observations are based on the available surface-based, remote-sensor measurements. From this perspective, the definition used here for cloud presence is based on the ability for remote-sensors to detect hydrometeors in the atmosphere. While an attempt has been made to maintain a consistent definition of cloud occurrence across the many observatories, each has a unique set of cloud observations instruments.本数据集包含美国阿拉斯加州阿塔斯库（Atqasuk）的云出现频次与云分层数据。云出现频次占比决定了云对气候系统的首要影响。本系列数据集记录了北极多个观测点位的云出现情况，并尽可能同步记录了云的垂直分布特征。观测数据基于现有地面遥感传感器的实测结果。基于此视角，本研究中云存在的定义以遥感传感器检测大气中水凝物的能力为判定依据。尽管已尽力在多个观测台站间维持统一的云出现频次定义，但每个台站均配备了专属的云观测仪器组合。