Arctic Summer Cloud Ocean Study (ASCOS) - Meteorological, Oceanographic and Ship Data Collected Onboard Icebreaker Oden during 31 July to 12 September 2008

The project Arctic Summer Cloud Ocean Study (ASCOS) was an international research expedition to the Arctic ocean. The Swedish icebreaker Oden served as the platform for the research carried out in the sea, on the glacier and on land. ASCOS left Longyearbyen on Svalbard in early August 2008 on the Swedish icebreaker Oden, heading for the central Arctic Ocean. To understand cloud formation a number of scientific specialties are needed, therefore ASCOS is genuinely interdisciplinary.The observations in ASCOS covered a column from 400 meters into the ocean, up through the troposphere; the lowest 8-12 km of the atmosphere where clouds and weather occurs. The plan was to spend as much time as possible in the central Arctic pack ice. Therefore Oden anchored in the pack ice to the ice floe, drifting with the ice for almost three weeks while taking detailed observations of processes determining the formation and life-cycle of clouds. Purpose: The goal of ASCOS was to increase our knowledge of clouds over the central Arctic Ocean by studying processes that are important to their formation and occurrence. This was achieved through interdisciplinary studies in which cloud formation was linked to the microbiological life in the ocean and ice, by means of detailed observations made from several hundred metres below the ocean’s surface to many kilometres up in the atmosphere. This data set contains meteorological, oceanographic and ship data collected during the expedition Arctic Summer Cloud Ocean Study (ASCOS), which was an international research cruise using the icebreaker Oden in the Arctic Ocean. The data were measured during the 40 days that Oden was cruising in the Arctic Ocean close to the north pole.Data includes meteorological variables: Air temperature, Humidity, Wind direction/speed, Atmospheric pressure.Oceanographic variables: Sea water temperature, Conductivity, Salinity and Sound velocity.Ship data: Position, Speed, Course. Quality Information: Obviously erroneous data (e.g. negative air pressure) have been omitted. No other processing or quality check of the data has been undertaken. Users should be aware of this in further data handling and analysis.

北极夏季云海洋研究（Arctic Summer Cloud Ocean Study, ASCOS）项目是一项前往北冰洋的国际科考远征。瑞典破冰船“奥登号”（Oden）作为科考平台，支撑了海洋、冰川及陆地相关研究工作。2008年8月初，ASCOS团队乘坐瑞典破冰船“奥登号”从斯瓦尔巴群岛（Svalbard）的朗伊尔城（Longyearbyen）出发，航向北冰洋中心区域。要理解云的形成机制需要多学科专业知识的支撑，因此ASCOS属于纯粹的跨学科研究项目。本次科考的观测覆盖了从海洋下方400米直至对流层的垂直柱体范围；对流层是大气中发生云系形成与天气现象的最低8至12千米层段。科考计划尽可能多地在北冰洋中心浮冰区停留作业，因此“奥登号”停泊于浮冰群中，随浮冰漂流近三周时间，期间对决定云形成与生命周期的各类过程开展了精细化观测。研究目标：ASCOS的核心目标是，通过研究对北冰洋中心区域云的形成与存在至关重要的过程，加深我们对该区域云系的认知。这一目标通过跨学科研究得以实现：研究将云形成过程与海洋及冰体中的微生物生命活动相关联，观测范围覆盖从海洋表面以下数百米直至大气数千米高空的全维度空间。本数据集包含北极夏季云海洋研究（ASCOS）科考期间采集的气象、海洋学及船舶数据，本次国际科考巡航以破冰船“奥登号”为作业平台，在北冰洋海域开展科考。数据采集时段为“奥登号”在北极点附近北冰洋海域巡航的40天期间。数据涵盖以下类别：1. 气象变量：气温、湿度、风向/风速、大气压强；2. 海洋学变量：海水温度、电导率、盐度和声速；3. 船舶数据：位置、航速、航向。质量说明：显然存在错误的数据（如负大气压强值）已被剔除，未对数据进行其他处理或质量校验。使用者在后续数据处理与分析工作中需注意这一情况。