Holocene climate change in Arctic Canada and Greenland
Holocene climate change in Arctic Canada and Greenland
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DOI：
10.1016/j.quascirev.2016.02.010
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发表时间：
2016-09-01
影响因子：
4
通讯作者：
Wagner, Bernd
中科院分区：
文献类型：
--
作者：
Briner, Jason P.;McKay, Nicholas P.;Wagner, Bernd
这篇综合论文总结了已发表的替代气候证据，显示了加拿大北极和格陵兰岛全新世气候变化的时空格局。我们的合成包括来自最近发布的高度分辨率的北极全新世古气候时间序列数据库的47条记录(Sundqvist等人，2014年)。我们分析了数据库所代表的温度历史，并将它们与另外54条已发表的记录中的古气候和环境信息进行了比较，这些记录大多来自不符合北极全新世数据库选择标准的数据集。结合起来，我们回顾了来自各种代理档案的证据，包括冰川(冰芯和冰川地貌)、湖泊沉积物、泥炭序列以及海岸和深海海洋沉积物。温度敏感记录表明，北部和东部的全新世温暖更一致和更早，南部和西部更分散和更晚的全新世最高温度。主成分分析揭示了全新世的两种主要趋势，一种是在全新世早期变暖，然后在中期降温；另一种是在全新世中期变暖，然后在晚全新世降温。从全新世最热部分到最冷部分的降温平均为3.0+/-1.0摄氏度(n=11个地点)。格陵兰冰盖在5ka到3ka之间收缩到了最小的程度，这与格陵兰周围的许多地点一致，描绘了大约在那个时候从温暖到凉爽的条件。整个全新世温度变化的空间格局可能是由全新世北纬夏季日照减少、全新世早期冰盖减弱的不同影响以及大西洋水不同地流入研究区所驱动的。(C)2016爱思唯尔有限公司。保留所有权利。
This synthesis paper summarizes published proxy climate evidence showing the spatial and temporal pattern of climate change through the Holocene in Arctic Canada and Greenland. Our synthesis includes 47 records from a recently published database of highly resolved Holocene paleoclimate time series from the Arctic (Sundqvist et al., 2014). We analyze the temperature histories represented by the database and compare them with paleoclimate and environmental information from 54 additional published records, mostly from datasets that did not fit the selection criteria for the Arctic Holocene database. Combined, we review evidence from a variety of proxy archives including glaciers (ice cores and glacial geomorphology), lake sediments, peat sequences, and coastal and deep-marine sediments. The temperature-sensitive records indicate more consistent and earlier Holocene warmth in the north and east, and a more diffuse and later Holocene thermal maximum in the south and west. Principal components analysis reveals two dominant Holocene trends, one with early Holocene warmth followed by cooling in the middle Holocene, the other with a broader period of warmth in the middle Holocene followed by cooling in the late Holocene. The temperature decrease from the warmest to the coolest portions of the Holocene is 3.0 +/- 1.0 degrees C on average (n = 11 sites). The Greenland Ice Sheet retracted to its minimum extent between 5 and 3 ka, consistent with many sites from around Greenland depicting a switch from warm to cool conditions around that time. The spatial pattern of temperature change through the Holocene was likely driven by the decrease in northern latitude summer insolation through the Holocene, the varied influence of waning ice sheets in the early Holocene, and the variable influx of Atlantic Water into the study region. (C) 2016 Elsevier Ltd. All rights reserved.