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.

本数据集收录了美国阿拉斯加州阿塔斯库（Atqasuk）的云出现情况与云层分层数据。云出现频率（cloud occurrence fraction）决定了云对气候系统的一级影响。本数据集记录了北极多个区域的云出现情况，并尽可能同步记录了云的垂直分布特征。观测数据均基于现有地基遥感传感器的实测结果。基于该视角，本文所采用的云存在判定标准，以遥感传感器能否探测到大气中的水凝物（hydrometeors）为依据。尽管已尝试在各观测台站间统一云出现的判定标准，但每个台站均配备了专属的云观测仪器组合。