High-resolution bathymetry models for the Lena Delta and Kolyma Gulf coastal zones
High-resolution bathymetry models for the Lena Delta and Kolyma Gulf coastal zones
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DOI：
10.5194/essd-2021-256
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发表时间：
2021-09
影响因子：
11.4
通讯作者：
M. Fuchs;J. Palmtag;B. Juhls;P. Overduin;G. Grosse;A. Abdelwahab;M. Bedington;Tina Sanders;O. Ogneva;I. Fedorova;N. Zimov;P. Mann;J. Strauss
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作者：
M. Fuchs;J. Palmtag;B. Juhls;P. Overduin;G. Grosse;A. Abdelwahab;M. Bedington;Tina Sanders;O. Ogneva;I. Fedorova;N. Zimov;P. Mann;J. Strauss
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，影响着受冻土影响的陆地生态系统向北冰洋沿岸的泥沙动力学和养分通量。为了准确地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，我们需要了解海底特征和沿海地区的地形变化。迄今为止，来自西伯利亚北极大陆架东部的浅层和大面积地区的数字测深数据很少。我们已经数字化了近75,000个地点的深度测量信息，这些信息来自西伯利亚东北部的勒拿河三角洲和科雷马海湾地区的大尺度当前和历史航海地图。我们提出了第一个详细和无缝的三角洲/海湾地区海岸带测深数字模型。我们将自己的水深测量数据与现有的深度测量数据相结合，验证了所得的测深层，结果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，以更好地量化流向北冰洋的河流和沿海碳通量，但可能对一系列与北极三角洲和近岸动力学相关的其他研究有用，如海底永久冻土、近岸海冰或陆架沉积物运输的建模。新的数字高分辨率测深产品可在PANGAEA数据集存储库中获得（Fuchs等人，2021a, b）。同样，PANGAEA的深度验证数据也可用（Fuchs et al., 2021c）。
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).