Early Holocene Laurentide Ice Sheet Retreat Influenced Summer Atmospheric Circulation in Baffin Bay
Early Holocene Laurentide Ice Sheet Retreat Influenced Summer Atmospheric Circulation in Baffin Bay
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DOI：
10.1029/2023gl103428
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发表时间：
2023-06
影响因子：
5.2
通讯作者：
E. Thomas;A. Cluett;M. Erb;N. McKay;J. Briner;I. Castañeda;M. Corcoran;O. Cowling;D. Gorbey-D.-Go
中科院分区：
文献类型：
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作者：
E. Thomas;A. Cluett;M. Erb;N. McKay;J. Briner;I. Castañeda;M. Corcoran;O. Cowling;D. Gorbey-D.-Go
冰盖大小的变化会影响大气环流，这是一种由模型记录但受少数古气候记录限制的现象。我们提出了亚百年尺度的夏季温度和夏季降水氢同位素比（δ 2 H）的记录，跨度12-7 ka，从巴芬岛的一个湖泊。在瞬态模式模拟中，该地区的风受高压系统的相对强度以及格陵兰岛和劳伦泰德冰盖退缩上方的相关反气旋环流控制。夏季气温与降水δ 2 H代用记录的相关关系在9.8ka时由负相关变为正相关。这种相关性结构表明，从交替的本地和远程水分，由两个冰盖高压系统，只有远程水分9.8 ka后，由强大的格陵兰高压系统的Laurentide冰盖退缩。这种快速的大气环流变化也可能是对未来冰盖逐渐退缩的反应。
Changes in ice‐sheet size impact atmospheric circulation, a phenomenon documented by models but constrained by few paleoclimate records. We present sub‐centennial‐scale records of summer temperature and summer precipitation hydrogen isotope ratios (δ2H) spanning 12–7 ka from a lake on Baffin Island. In a transient model simulation, winds in this region were controlled by the relative strength of the high‐pressure systems and associated anticyclonic circulation over the retreating Greenland and Laurentide ice sheets. The correlation between summer temperature and precipitation δ2H proxy records changed from negative to positive at 9.8 ka. This correlation structure indicates a shift from alternating local and remote moisture, governed by the two ice‐sheet high‐pressure systems, to only remote moisture after 9.8 ka, governed by the strong Greenland high‐pressure system after the Laurentide Ice Sheet retreated. Such rapid atmospheric circulation changes may also occur in response to future, gradual ice‐sheet retreat.