CTD data from Nansen Legacy Cruise - JC3 Winter gaps cruise Station: Kvit1

The Nansen Legacy JC3 cruise (19.02.-11.03.2022) aimed to fill gaps after the earlier NL cruises, in particular during the winter-to-spring transition and in the northern part of the NL transect to the Nansen Basin. Joint physical, chemical, and biological sampling and experiments for new technology addressed aims of RF1, RF2, RF3 and RA-C. Sampling started in the Atlantic domain with a process station at P1. Afterwards, the cruise focused on the northern Barents Sea around and north of Kvit?ya covering process stations at P5, P7 and between Nord Austlandet and Kvit?ya. They lasted from 29 to 68 hours to enable observation of at least one daily cycle in the under-ice water layer. Ice conditions varied but consisted mostly of extensive but thin first-year ice, often as small floes that were frozen together. In the northernmost region, the floes were larger, but the ice remained thin. Despite a fair amount of daylight available, the biological sampling seemed to indicate that the ecosystem was still in winter mode. In addition to the process stations, the northern part of the NL transect was covered from the shelf north of Kvit?ya into the deeper Nansen Basin. This included mainly hydrographic measurements and chemical sampling along the entire transect, biological sampling at P6, and benthic sampling at selected depths from shelf over slope to deep. In the entire region, warm Atlantic water was prominent and close to the surface, potentially explaining the lack of thick sea ice and late ice formation. Before and after the main cruise program, several gliders were recovered. One mooring was pinged but could not be located. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-675177809). The values have not be changed.

"南森遗产"JC3航次（2022年2月19日至3月11日）旨在填补此前NL航次遗留的科考空白，尤其是在冬春转换期以及NL断面通往南森盆地的北部区段。本次航次联合开展物理、化学与生物学采样及新技术试验，以达成RF1、RF2、RF3及RA-C的研究目标。

采样工作始于大西洋海域的P1过程站位。随后航次聚焦巴伦支海北部克维特岛（Kvitøya）周边及以北海域，布设了P5、P7以及北奥斯特兰岛与克维特岛之间的过程站位。各站位观测时长为29至68小时，以实现冰下水层至少一个全日周期的连续观测。航区冰况存在差异，但整体以大范围薄型一年冰为主，多为相互冻结的小型浮冰。在最北端海域，浮冰体量更大，但冰层仍较薄。尽管当日可观测日照时长充足，生物学采样结果仍显示该生态系统仍处于冬季运行状态。

除过程站位外，NL断面北部区段从克维特岛以北的陆架延伸至更深的南森盆地，该区段主要涵盖沿整个断面的水文测量与化学采样、P6站位的生物学采样，以及从陆架、陆坡至深海的选定深度的底栖生物采样。整个航区内暖大西洋水占据主导且接近表层，这或可解释为何海冰厚度较薄且结冰时间偏晚。

在主航次计划实施前后，共回收多台自主水下滑翔机。另有一套锚系观测设备被声呐定位，但未能成功回收。本数据集基于挪威海洋数据中心（NMDC）发布的本次全航次温盐深剖面仪（CTD）数据生成（https://doi.org/10.21335/NMDC-675177809），数据数值未做任何修改。