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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sediment accumulation rates in subpolar fjords - Impact of post-Little Ice Age glaciers retreat, Billefjorden, Svalbard
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Sediment accumulation rates in subpolar fjords - Impact of post-Little Ice Age glaciers retreat, Billefjorden, Svalbard

机译：亚极峡湾的沉积物堆积率-小冰期后冰川退缩的影响，斯利巴德市Billefjorden

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摘要

The Little Ice Age (～1600-1900 AD) and 20th century sediment accumulation rates in Billefjorden, a subpolar fjord on Svalbard, were reconstructed by applying ~(210)Pb, ~(137)Cs and AMS ~(14)C datings. The modern sediment accumulation rate decreases from more than 0.39 cmy~(-1) at the fjord head to 0.08 cm y~(-1) close to the fjord mouth. However, during the Little Ice Age the sediments accumulated at a much lower rate of 0.02 cmy~(-1) in the central fjord basin. This difference is most likely related to the rapid retreat of glaciers during the 20th century, when most of them withdrew up to 2 km. The post-Little Ice Age increases in temperature and a negative glacier mass balance resulted in a larger meltwater discharge transferring substantial amounts of sediments released from the glaciers, as well as those eroded from previously stored unconsolidated glacial sediments. A comparison of data from the subpolar fjords of Svalbard suggests that the increase in the sediment accumulation rate is a common trend, and further increases might be expected if climate warming continues. The properties of the fjord sediments (grain size, IRD, coarse-fraction composition, clay mineralogy) from the Little Ice Age and the 20th century showed no distinct differences. The change in the accumulation rate may be the most evident sedimentary record of this climatic change.
机译：利用〜（210）Pb，〜（137）Cs和AMS〜（14）C测年法重建了斯瓦尔巴特群岛次极峡湾Billefjorden的小冰河时期（〜1600-1900 AD）和20世纪的沉积物沉积速率。现代沉积物的沉积速率从峡湾头的0.39 cmy〜（-1）降低到峡湾口附近的0.08 cm y〜（-1）。然而，在小冰期，沉积物以0.02 cmy〜（-1）的低得多的速率聚集在峡湾中部盆地。这种差异很可能与20世纪冰川退缩有关，当时大多数冰川退缩了2公里。小冰期后温度升高，冰川负质量平衡导致较大的融水排放量，从而转移了从冰川释放的大量沉积物，以及先前储存的未固结的冰川沉积物所侵蚀的沉积物。来自斯瓦尔巴特群岛极地峡湾的数据比较表明，沉积物积累速率的增加是一个普遍趋势，如果气候变暖持续下去，则有望进一步增加。小冰期和20世纪的峡湾沉积物的性质（粒度，IRD，粗级分组成，粘土矿物学）没有明显差异。累积速率的变化可能是这种气候变化最明显的沉积记录。

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