CTD data from Nansen Legacy Cruise - JC3 Winter gaps cruise Station: NLEG18

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（Nansen Legacy）JC3航次（2022年2月19日至3月11日）旨在弥补此前NL航次遗留的观测空白，尤其是在冬春转换期以及NL断面通往南森盆地（Nansen Basin）的北段海域。本次航次开展了多学科联合物理、化学与生物采样及新技术试验，以满足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。随后航次作业聚焦于巴伦支海北部怀特岛（Kvitøya）周边及以北海域，涵盖P5、P7站位以及北奥斯兰岛（Nord Austlandet）与怀特岛之间的过程站位。各站位作业时长为29至68小时，以实现在冰下水层开展至少一个全日周期的观测。
海冰状况存在差异，但整体以大范围分布的薄型一年冰为主，这些海冰多由小型浮冰冻结结合而成。在最北端海域，浮冰体积更大，但海冰仍保持薄型。尽管当日可获得充足日照，但生物采样结果显示该海域生态系统仍处于冬季状态。
除过程站位外，NL断面北段的采样覆盖了从怀特岛以北陆架直至南森盆地深水区的海域，主要内容包括全断面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开展底栖采样。
整个海域均以暖性大西洋水为主且贴近表层，这或许可以解释为何海冰厚度较薄且形成时间较晚。在主航次计划实施前后，共回收了多台海洋滑翔机。曾对一处锚系设备进行声呐定位，但未能找到其具体位置。
本数据集基于挪威海洋数据中心（NMDC）公开的本次全航次CTD（温盐深剖面仪）数据构建（https://doi.org/10.21335/NMDC-675177809），所有数值均未作修改。