CTD Profiles from the HDMS Lauge Koch cruise to East Greenland fjords, August 2018

Greenland fjords are currently undergoing large ecosystem changes due to unprecedented melting of the Greenland Ice Sheet (GrIS). The rapidly increasing discharge of meltwater and ice not only influences circulation patterns and stratification of the water column, but it also introduces large fluxes of allochthonous carbon and nutrients into the Greenland coastal environment, as well as transports large quantities of inorganic particles and suspended sediments which could limit light availability to primary producers. However, data is still limited for most Greenland fjord systems and the east coast of Greenland is especially understudied. During this cruise we investigated 3 different fjord systems of East Greenland in August 2018 aboard the HDMS Lauge Koch. We aimed to describe the physical, chemical and biological variability from glaciers to the shelf. This data set consists of 84 CTD profiles that were obtained with a Seabird SBE25 conductivity, temperature, depth (CTD) instrument. In addition to measuring pressure, conductivity, and temperature, the CTD recorded chlorophyll-a fluorescence, photosynthetically available radiation (PAR), dissolved oxygen, turbidity and pH. The instrument was factory calibrated before the cruise. The CTD recorded variables at 16 Hz and the raw data were processed using Seabird standard workflow to produce 0.1 m binned profiles using the downcast data only. This dataset compiles all CTD variables measured from all profiles into a single comma separated CSV file. 

We would like to thank the captain and crew of HDMS Lauge Koch for excellent collaboration. The cruise was funded by the Danish Center for Marine Research and by the EU Horizon2020 funded project INTAROS (grant no. 727890) and the Danish Cooperation for Environment in the Arctic.

受格陵兰冰盖（Greenland Ice Sheet, GrIS）前所未有的消融影响，当前格陵兰峡湾正经历剧烈的生态系统变化。快速增加的融水与冰体径流，不仅改变了水体环流模式与层化结构，还向格陵兰近岸海域输入了大量外源碳与营养盐，同时裹挟巨量无机颗粒与悬浮沉积物——这些物质会抑制初级生产者获取光照。然而，多数格陵兰峡湾系统的观测数据仍较为匮乏，格陵兰东海岸的研究程度更是极低。

本研究于2018年8月搭乘HDMS Lauge Koch号科考船，对格陵兰东部的3处不同峡湾系统开展了调查，旨在解析从冰川到陆架区域的物理、化学与生物变量变化特征。本数据集包含84组由Seabird SBE25型电导率-温度-深度（conductivity, temperature, depth, CTD）剖面仪采集的剖面数据。该仪器除可采集压力、电导率与温度数据外，还同步记录了叶绿素a荧光、光合有效辐射（photosynthetically available radiation, PAR）、溶解氧、浊度与pH值。本航次前，该仪器已完成工厂校准。CTD以16 Hz的频率采集变量数据，原始数据采用Seabird标准处理流程进行预处理，仅使用下行剖面数据生成0.1米间隔的分箱剖面。本数据集将所有剖面采集的全部CTD变量整合为一份逗号分隔值（comma separated values, CSV）格式文件。

本研究感谢HDMS Lauge Koch号的船长与全体船员的鼎力协作。本次航次由丹麦海洋研究中心、欧盟地平线2020（Horizon2020）资助项目INTAROS（项目编号：727890）以及丹麦北极环境合作计划共同资助。