Abstract. Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie Delta region of northwestern Canada, coupled with increases in river discharge and coastal erosion, trigger the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing, well-established, and its rate is accelerating, the fate of the newly-mobilized organic matter, as it transits from the watershed through the delta and into the marine system, remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of the Work Package 4 (WP4) Coastal Waters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice break-up in summer, as well as anterior to the freeze-up period in fall. To capture the fluvial-marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms: helicopters, snowmobiles and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC, DOC), and chromophoric dissolved organic matter (CDOM), as well as a suite of physical, chemical and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sensing reflectance, temperature and salinity, particle absorption, nutrients, dissolved organic carbon, particulate organic carbon, particulate organic nitrogen, colored dissolved organic matter absorption, fluorescent dissolved organic matter intensity, suspended particulate matter, total particulate carbon, total particulate nitrogen, stable water isotopes, radon in water, bacterial abundance, and a string of phytoplankton pigments including total chlorophyll. Datasets and related metadata can be found in Juhls et al. 2021. https://doi.pangaea.de/10.1594/PANGAEA.937587.

中文翻译：

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Nunataryuk 野外活动：了解 Mackenzie Delta 地区沿海水域陆地有机物的起源和归宿

摘要。气候变暖和北极土壤热变化的相关驱动因素预计将改变常年冻土中碳的分布和动态。加拿大西北部麦肯齐三角洲地区的永久冻土融化，加上河流流量和海岸侵蚀的增加，引发了北美最大的北极流域向北冰洋释放陆地有机物 (OMt)。虽然这一过程正在进行中、已确立并且其速度正在加快，但新迁移的有机物在从分水岭通过三角洲进入海洋系统时的命运仍然知之甚少。在欧洲地平线 2020 努纳塔留克计划的框架内，并作为工作包 4 (WP4) 沿海水域主题的一部分，2019 年 4 月至 2019 年 9 月，在麦肯齐三角洲地区和博福特海南部进行了四次实地考察。时间抽样设计允许在春季淡水之前，在冰解期间，在全冰覆盖下对沿海水域的环境条件进行调查。夏季，以及秋季冻结期之前。为了捕捉河流-海洋过渡区，并应对与浅水和不断变化的季节和气象条件相关的独特挑战，现场采样是与 Aklavik、Inuvik 和 Tuktoyaktuk 社区成员密切合作进行的，使用了几个平台：直升机、雪地摩托和小船。现场测量物理和光学变量的水柱剖面，而地表水，收集和保存地下水和沉积物样品，用于确定 OMt 的组成和来源，包括颗粒和溶解有机碳 (POC、DOC) 和发色溶解有机物 (CDOM)，以及一套物理、化学和生物学变量。在这里，我们概述了标准化数据集，包括水文剖面、遥感反射率、温度和盐度、颗粒吸收、营养物质、溶解有机碳、颗粒有机碳、颗粒有机氮、有色溶解有机物吸收、荧光溶解有机物强度, 悬浮颗粒物, 总颗粒碳, 总颗粒氮, 稳定水同位素, 水中氡, 细菌丰度,数据集和相关元数据可以在 Juhls 等人中找到。2021. https://doi.pangaea.de/10.1594/PANGAEA.937587。