Hydrometeor particle size distribution data collected using a snow particle counter on board the R/V Akademik Tryoshnikov in the Southern Ocean during the austral summer of 2016/17 as part of the Antarctic Circumnavigation Expedition (ACE).

<strong>Dataset abstract</strong> The data consist of the hydrometeor particle size distribution for particles with a size range (average diameter) from 36 to 490 μm (with the last bin including all detected particles larger than 490 μm) detecting the flux of snow, rain and other particles including sea spray passing through a photo-electric snow particle counter (SPC-95) installed on board the R/V Akademik Tryoshnikov as part of the Antarctic Circumnavigation Expedition (ACE). Data were recorded from January to March 2017 in the Southern Ocean. Here we present the raw data set, generated by the SPC-95 Data Processing Device, which consists of the number of particles, classified into 64 size bins, passing through the snow particle counter with a time resolution of one second. Data are presented in daily files and have undergone some pre-processing. The data were collected as part of ACE project 18 aiming to estimate freshwater fluxes (particularly precipitation and blowing snow) and understand their contribution to surface freshening in the Southern Ocean. <strong>Dataset contents</strong> UYYMMDD_hhmmssSnow-XXX-1sec-org-YYYY.csv, data files, comma-separated values data_file_header.txt, metadata, text README.txt, metadata, text where XXX is the sensor code number and YYY is the CF serial number. <strong>Dataset license</strong> This pre-processed hydrometeor particle flux dataset from ACE is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/数据集摘要 本数据集包含粒径范围（平均直径）为36~490μm的水凝物（hydrometeor）粒子的粒径分布数据，其中最后一个粒径档涵盖所有粒径大于490μm的已检测粒子。数据采集的是安装于“科学院特廖什尼科夫号”科考船的光电雪粒计数器（SPC-95）所检测的降雪、降雨及包括海沫在内的各类粒子的通量，该设备作为南极环球科考航次（ACE）的组成部分部署。数据采集时间为2017年1月至3月，采集区域为南大洋。 本数据集呈现由SPC-95数据处理装置生成的原始数据，该数据以1秒为时间分辨率，统计了经过雪粒计数器的、被划分为64个粒径档的粒子数量。数据以日度文件形式存储，并已完成初步预处理。本次数据采集作为ACE项目18的一部分，旨在估算淡水通量（尤其是降水和吹雪通量），并阐明其对南大洋表层海水淡化的贡献。 数据集内容 数据文件命名格式为`UYYMMDD_hhmmssSnow-XXX-1sec-org-YYYY.csv`，为逗号分隔值（CSV）格式数据文件；另有`data_file_header.txt`（元数据文本文件）与`README.txt`（元数据文本文件）。其中XXX为传感器代码编号，YYY为CF序列号。 数据集许可 本来自ACE航次的预处理水凝物粒子通量数据集采用知识共享署名4.0国际许可协议（Creative Commons Attribution 4.0 International License，CC BY 4.0）进行授权，协议全文可通过https://creativecommons.org/licenses/by/4.0/ 查阅。