Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica
Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica
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DOI：
10.5194/cp-19-293-2023
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发表时间：
2023-02
影响因子：
4.3
通讯作者：
Ikumi Oyabu;K. Kawamura;S. Fujita;Ryo Inoue;H. Motoyama;K. Fukui;M. Hirabayashi;Yu Hoshina;
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作者：
Ikumi Oyabu;K. Kawamura;S. Fujita;Ryo Inoue;H. Motoyama;K. Fukui;M. Hirabayashi;Yu Hoshina;
抽象的。我们利用15个浅冰芯和7个雪坑的数据重建了南极洲富士穹顶周围过去5000年的表面物质平衡。冰芯的深度-年龄关系是通过利用火山信号将它们与来自南极洲西部的按层计数的冰芯(WAIS划分冰芯)同步确定的。重建的过去4000年的SMB记录显示了它们相对于富士圆顶周围冰层的位置、靠近海洋和风向的位置可能会影响到的空间模式。来自单个冰芯和雪坑的SMB记录被叠加在一起，以重建富士穹顶地区的SMB历史。在前工业时期，叠加记录呈长期递减趋势，在过去的5000年，每世纪平均-0.037±0.005 kg m−2。这一下降趋势可能是由于南极洲东部和南大洋的长期表面冷却以及水汽源区海冰的膨胀所致。去掉记录后，富士圆顶SMB的数十年至百年变化在过去1000年中显示出四个不同的时期：公元1300年之前为负值，公元1300年至1450年为小幅正值，公元1450年至1850年为小幅负值，最大值在公元1600年左右较弱，公元1850年之后出现强劲增长。这些变化与之前重建的东南极高原SMB记录的变化一致。低累积速率时期往往与过去1000年强烈的火山作用力和太阳极小相结合，但对于较老的时期，这种对应关系并不清楚，可能是因为火山作用力和太阳作用力不一致，或者由于堆积的岩芯数量较少，SMB记录恶化。
Abstract. We reconstructed surface mass balance (SMB) around Dome Fuji, Antarctica, over the last 5000 years using the data from 15 shallow ice cores and seven snow pits. The depth–age relationships for the ice cores were determined by synchronizing them with a layer-counted ice core from West Antarctica (WAIS Divide ice core) using volcanic signals. The reconstructed SMB records for the last 4000 years show spatial patterns that may be affected by their locations relative to the ice divides around Dome Fuji, proximity to the ocean, and wind direction. The SMB records from the individual ice cores and snow pits were stacked to reconstruct the SMB history in the Dome Fuji area. The stacked record exhibits a long-term decreasing trend at -0.037±0.005 kg m−2 per century over the last 5000 years in the preindustrial period. The decreasing trend may be the result of long-term surface cooling over East Antarctica and the Southern Ocean and sea ice expansion in the water vapor source areas. The multidecadal to centennial variations of the Dome Fuji SMB after detrending the record shows four distinct periods during the last millennium: a mostly negative period before 1300 CE, a slightly positive period from 1300 to 1450 CE, a slightly negative period from 1450 to 1850 CE with a weak maximum around 1600 CE, and a strong increase after 1850 CE. These variations are consistent with those of previously reconstructed SMB records in the East Antarctic plateau. The low accumulation rate periods tend to coincide with the combination of strong volcanic forcings and solar minima for the last 1000 years, but the correspondence is not clear for the older periods, possibly because of the lack of coincidence of volcanic and solar forcings or the deterioration of the SMB record due to a smaller number of stacked cores.