Conductivity-Temperature-Depth (CTD) and Geochemistry Data from 2021 Expedition of the Canadian Coast Guard Ship Louis S. St-Laurent

Contains data from a hydrographic cruise conducted about the aboard the Canadian Coast Guard Ship, CCGS Louis S. St-Laurent, August 19 to September 16th, 2021 under the Beaufort Gyre Observing System (BGOS)/Joint Ocean Ice Study (JOIS). Data were collected under the NSF award "AON Collaborative Research: Continuation of long-term Beaufort Gyre observations in 2020-2024 to enhance understanding of the Arctic's role in climate variability" in collaboration with researchers from Fisheries and Oceans Canada at the Institute of Ocean Sciences (Bill Williams and Sarah Zimmermann, Institute of Ocean Sciences). There were 57 conductivity temperature depth (CTD) casts performed using a SBE911+ CTD system with 24 10-Liter (L) Niskins. The CTD data for down casts are provided in 1-decibar (db) averaged files (*.cnv), in Seabird's text format with one file per cast and separate files. Cruise documentation is available as a text file. Geochemistry data are provided in a separate excel spreadsheet.

本数据集源自2021年8月19日至9月16日期间，搭乘加拿大海岸警卫队“路易·S·圣罗兰号”（CCGS Louis S. St-Laurent）科考船开展的水文巡航，该项目隶属于波弗特海环流观测系统（Beaufort Gyre Observing System, BGOS）与联合海冰研究计划（Joint Ocean Ice Study, JOIS）。本次数据采集工作由美国国家科学基金会（National Science Foundation, NSF）项目“AON合作研究：延续2020-2024年波弗特海环流长期观测，以深化对北极在气候变率中的作用的理解”资助，并与加拿大渔业与海洋部海洋科学研究所的研究人员（Bill Williams与Sarah Zimmermann，海洋科学研究所）协作完成。本次巡航共开展57次温盐深（conductivity temperature depth, CTD）剖面测量，采用SBE911+型温盐深系统搭配24个10升（L）尼斯金采水器。下行剖面的CTD数据以每1分巴（decibar, db）平均的文件格式存储，扩展名为*.cnv，采用海鸟电子（Seabird）的文本格式，每个剖面对应一个独立文件。巡航相关文档以文本文件形式提供。地球化学数据则单独存储于Excel电子表格中。