CTD data from Nansen Legacy Cruise - JC3 Winter gaps cruise Station: Kvit6

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.

南森遗产号JC3科考航次（2022年2月19日—3月11日）旨在填补此前NL航次遗留的研究空白，尤其聚焦冬春转换期以及NL断面通往南森盆地的北部区域。本次航次联合开展物理、化学与生物采样及新技术试验，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过程观测站位。此后，航次重点聚焦巴伦支海北部怀特岛周边及以北区域，涵盖P5、P7站位以及北奥斯兰岛与怀特岛之间的观测站位。各站位观测持续29至68小时，以实现冰下水层至少一个全日周期的观测。冰况存在显著差异，但整体以大范围分布的薄型一年冰为主，此类冰体多由冻结成团的小型浮冰组成。在最北端区域，浮冰尺寸更大，但冰体依然较薄。尽管当日光照充足，生物采样结果仍显示该生态系统仍处于冬季状态。除过程观测站位外，NL断面北部区域的采样覆盖了从怀特岛以北陆架直至南森盆地深水区域的完整断面。本次采样主要包括全断面的水文测量与化学采样、P6站位的生物采样，以及从陆架经陆坡至深海的选定深度处的底栖生物采样。整个区域内暖大西洋水占据主导且接近表层，这或许可以解释为何海冰厚度不足且结冰时间偏晚。在主航次计划实施前后，共回收多台水下滑翔机。另有一套锚系设备被探测到信号，但未能完成定位。本数据集基于NMDC发布的本次全航次温盐深剖面仪（CTD）数据构建（https://doi.org/10.21335/NMDC-675177809），所有数值均未作改动。