水文水深数据修正的普里兹湾数字水深模型

An improved digital bathymetric model for Prydz Bay by hydrography observations

在第一版国际南大洋地图集(the International Bathymetric Chart of the Southern Ocean Version 1.0,IBCSO V1)的基础上,利用现场水文观测中的水深数据重构了普里兹湾及其周围海域的海底地形,建立了更准确的高分辨率数字水深模型。从多套现场水文观测数据中提取了水深观测结果,去除重复剖线后,比较了水文观测中的水深数据与IBCSO V1在500 m×500 m网格上的差异。在保留IBCSO V1中原始多波束、单波束回声测深数据和其他水深观测数据的前提下,使用插值技术修正了无观测数据海域地形。基于大量的海豹观测数据在较大程度上订正了IBCSO V1海床深度。与IBCSO V1海床深度相比,从戴维斯站以东至82°E的南极大陆沿岸、埃默里冰架前缘西部以及西冰架前缘附近区域的海床深度被低估的可能性最大。优化的南极普里兹湾海域水深数字地图改进了对普里兹湾海底地形结构特征的认识。更加准确的地形数据有利于理解海底地形对普里兹湾海洋环流的影响和建立更加可靠的数值模型。

Based on the International Bathymetric Chart of the Southern Ocean Version 1.0(IBCSO V1),we rebuilt an improved high resolution digital bathymetric model for the bathymetry of Prydz Bay and the surrounding region by compiling the water depths from in situ hydrography observations.After removing the reduplicated data from multiple data sets,we compared the water depths from the in situ hydrography observations with the seafloor depths from the IBCSO V1 on the original IBCSO grid with a 500 m×500 m spatial resolution.In the revised bathymetry,the data including multi-beam and single-beam echo soundings,digitized depths from nautical charts in IBCSO complete preserved,and only the interpolated bathymetry in IBCSO revise,using the water depths from in situ hydrography observations with a specific gridding technique.Our bathymetry revision is mostly benefited from the remarks by equipped seals,especially in the coastal regions from south of Davis Station to 82°E,west of Amery Ice shelf front and the neighborhood of West Ice Shelf front,where benthic observations existed and the ocean bottom is extremely deepened compared to the current datasets.The improved digital bathymetric model provides insights into new topographical features in these regions.Besides,,by revealing an accurate seafloor around the continental shelf region of Prydz Bay,it can favor our understanding of the dynamic influences of bathymetry on the circulations of the ocean and the sea ice and the basal mass balance of the Amery Ice Shelf.