A geomorphological seabed classification for the Weddell Sea, Antarctica

A geomorphological seabed classification for the Weddell Sea, Antarctica
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南极洲威德尔海的地貌海底分类

DOI:
10.1007/s11001-015-9256-x
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发表时间:
2016
影响因子:
1.4
通讯作者:
Dorschel
Dorschel
中科院分区:
地球科学3区
文献类型:
--
作者:
Jerosch;Krajnik;Scharf;Dorschel

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海底形态在生态学、水文学和沉积学等许多科学学科中发挥着重要作用,因为地貌特征可以作为物种分布、海洋水流路径估计或沉积过程的物理控制。在这项研究中,我们基于测绘项目IBCSO提供的500米×500米分辨率的测深数据,对韦德尔海进行了地形分析。根据精细和广泛的海底定位指数计算,在海底识别出17个海底级别,突出了冰川雕刻大陆架的多样性。除了形态外,还计算了坡度、坡向、地形粗糙度和山体阴影,并将其提供给数据档案库Pangaea。对地貌特征进行地带性统计,明确指出韦德尔海陆架边缘的宽度为45-70千米,平均深度约为1200微米,范围从270微米到4300微米。5-7公里宽,建造大约。沿陆架边缘有40-70公里长的条带。这项研究表明,陡坎和凹陷控制着陆架和深海之间的连接,陡坎内的高倾角和低倾角在哪里发生。出于评估的目的,428个粒度样本被添加到海底分类图中。分别计算落入单一海底类别的泥沙、砂子和砾石的平均值,并根据共同的沉积物分类方案将其分配到一个沉积物结构类别。
Sea floor morphology plays an important role in many scientific disciplines such as ecology, hydrology and sedimentology since geomorphic features can act as physical controls for e.g. species distribution, oceanographically flow-path estimations or sedimentation processes. In this study, we provide a terrain analysis of the Weddell Sea based on the 500 m × 500 m resolution bathymetry data provided by the mapping project IBCSO. Seventeen seabed classes are recognized at the sea floor based on a fine and broad scale Benthic Positioning Index calculation highlighting the diversity of the glacially carved shelf. Beside the morphology, slope, aspect, terrain rugosity and hillshade were calculated and supplied to the data archive PANGAEA. Applying zonal statistics to the geomorphic features identified unambiguously the shelf edge of the Weddell Sea with a width of 45–70 km and a mean depth of about 1200 m ranging from 270 m to 4300 m. A complex morphology of troughs, flat ridges, pinnacles, steep slopes, seamounts, outcrops, and narrow ridges, structures with approx. 5–7 km width, build an approx. 40–70 km long swath along the shelf edge. The study shows where scarps and depressions control the connection between shelf and abyssal and where high and low declination within the scarps e.g. occur. For evaluation purpose, 428 grain size samples were added to the seabed class map. The mean values of mud, sand and gravel of those samples falling into a single seabed class was calculated, respectively, and assigned to a sediment texture class according to a common sediment classification scheme.
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