Abstract. Arctic river deltas and deltaic near-shore zones represent important land-ocean transition zones influencing sediment dynamics and nutrient fluxes from permafrost-affected terrestrial ecosystems into the coastal Arctic Ocean. To accurately model fluvial carbon and freshwater export from rapidly changing river catchments, as well assessing impacts of future change on the Arctic shelf and coastal ecosystems, we need to understand the sea floor characteristics and topographic variety of the coastal zones. To date, digital bathymetrical data from the poorly accessible, shallow and large areas of the eastern Siberian Arctic shelves are sparse. We have digitized bathymetrical information for nearly 75,000 locations from large-scale current and historical nautical maps of the Lena Delta and the Kolyma Gulf Region in Northeast Siberia. We present the first detailed and seamless digital models of coastal zone bathymetry for both delta/gulf regions. We validated the resulting bathymetry layers using a combination of our own water depth measurements and a collection of available depth measurements, which showed a strong correlation (r > 0.9). Our bathymetrical models will serve as an input for a high-resolution coupled hydrodynamic-ecosystem model to better quantify fluvial and coastal carbon fluxes to the Arctic Ocean but may be useful for a range of other studies related to Arctic delta and near-shore dynamics such as modelling of submarine permafrost, near-shore sea ice, or shelf sediment transport. The new digital high-resolution bathymetry products are available on the PANGAEA data set repository (Fuchs et al. 2021a, b). Likewise the depth validation data is available on PANGAEA as well (Fuchs et al., 2021c).

中文翻译：

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Lena Delta 和 Kolyma Gulf 沿海地区的高分辨率测深模型

摘要。北极河流三角洲和三角洲近岸带是重要的陆海过渡带，影响着从受永久冻土影响的陆地生态系统到北冰洋沿海的沉积物动力学和养分通量。为了准确模拟快速变化的河流集水区的河流碳和淡水输出，以及评估未来变化对北极大陆架和沿海生态系统的影响，我们需要了解沿海地区的海底特征和地形多样性。迄今为止，来自东西伯利亚北极大陆架难以获取的、浅的和大面积的数字测深数据很少。我们已经将近 75,000 个地点的水深信息数字化，这些信息来自莱拿三角洲和西伯利亚东北部科雷马湾地区的大型当前和历史航海地图。我们为三角洲/海湾地区提供了第一个详细且无缝的沿海地区测深数字模型。我们结合使用我们自己的水深测量值和可用深度测量值的集合来验证所得的测深层，这显示出很强的相关性 (r > 0.9)。我们的测深模型将作为高分辨率耦合水动力生态系统模型的输入，以更好地量化流入北冰洋的河流和沿海碳通量，但可能对与北极三角洲和近岸动力学相关的一系列其他研究有用，例如作为海底永久冻土、近岸海冰或陆架沉积物迁移的建模。PANGEA 数据集存储库中提供了新的数字高分辨率测深产品（Fuchs 等人，2021a，b）。