Holocene changes in sea-ice cover and polynya formation along the eastern North Greenland shelf: New insights from biomarker records
Holocene changes in sea-ice cover and polynya formation along the eastern North Greenland shelf: New insights from biomarker records
复制标题
DOI：
10.1016/j.quascirev.2020.106173
复制
发表时间：
2020-03
影响因子：
4
通讯作者：
Nicole Syring;R. Stein;K. Fahl;M. Vahlenkamp;Marc Zehnich;R. Spielhagen;F. Niessen
中科院分区：
文献类型：
--
作者：
Nicole Syring;R. Stein;K. Fahl;M. Vahlenkamp;Marc Zehnich;R. Spielhagen;F. Niessen
北极海冰是气候系统中最活跃的组成部分之一，了解控制其自然变化的过程有助于限制未来气候变化对这一高度敏感地区的影响。首次进行了高分辨率生物标志物研究，以重建北格陵兰东部过去的海冰变化。这一地区受到冷的地表沃茨和通过东格陵兰海流输送的流冰、东北格陵兰冰流出口冰川的融水脉冲以及陆地固定冰的积聚的强烈影响。PS 93/025岩心的全新世沉积剖面年代久远，提供了对海冰条件变化（区域和局部海冰信号）、海洋和大气环流以及生物对这些变化的反应的深入了解。这些生物标志物记录显示，减少到可变的海冰覆盖在全新世早期10.2和9.3万年之间，其次是稳定增加的海冰条件在全新世中期。在过去的5-6万年，海冰条件保持较稳定的季节性边缘海冰的情况。根据我们的生物标志物记录，稳定的海冰边缘条件，充分发展的冰间湖的情况发生在过去的1万年。
Understanding the processes controlling the natural variability of sea ice in the Arctic, one of the most dynamic components of the climate system, can help to constrain the effects of future climate change in this highly sensitive area. For the first time, a high-resolution biomarker study was carried out to reconstruct past sea-ice variability off eastern North Greenland. This area is strongly influenced by cold surface waters and drift ice transported via the East Greenland Current, meltwater pulses from the outlet glaciers of the Northeast Greenland Ice Stream and the build-up of landfast ice. The well-dated Holocene sedimentary section of Core PS93/025 provides insights into variations of the sea-ice conditions (regional and local sea-ice signal), oceanic and atmospheric circulation and the biotic response to these changes. These biomarker records show a reduced to variable sea-ice cover during the early Holocene between 10.2 and 9.3 ka, followed by a steady increase in sea-ice conditions during the mid Holocene. During the last 5–6 ka, sea-ice conditions remained more stable representing a seasonal to marginal sea-ice situation. Based on our biomarker records, stable sea-ice edge conditions, with a fully developed polynya situation occurred since the last 1 ka.