The Younger Dryas cold interval as viewed from central Greenland
The Younger Dryas cold interval as viewed from central Greenland
复制标题
DOI：
10.1016/s0277-3791(99)00062-1
复制
发表时间：
2000-01-01
影响因子：
4
通讯作者：
Alley, RB
中科院分区：
文献类型：
--
作者：
Alley, RB
格陵兰冰芯记录提供了异常清晰的气候突变的许多方面，特别是那些与新仙女木事件，如本文所述。保存完好一年一次的层可以很有把握地计算出来，大约在11500年前的新仙女木末期的年龄只有大约1%的误差。冰如何校正允许重建积雪积累率在数万年，几乎没有额外的不确定性。冰川化学和颗粒物数据记录了大气负荷的变化，几乎没有积雪变化带来的不确定性。通过使用冰同位素比、钻孔温度和气体同位素比进行特定地点的校准，可以提供可靠的古温度测量。冰芯古气候指标的局部、区域和更广泛的气候条件的几乎同时变化表明，地球大部分地区在30年或更短的时间内经历了与格陵兰同步的突然气候变化。后新仙女木事件的变化没有复制这些古气候变化的规模、范围和速度。(C)1999 Elsevier Science Ltd.保留所有权利。
Greenland ice-core records provide an exceptionally clear picture of many aspects of abrupt climate changes, and particularly of those associated with the Younger Dryas event, as reviewed here. Well-preserved. annual layers can be counted confidently, with only approximate to 1% errors for the age of the end of the Younger Dryas approximate to 11,.500 years before present. Ice-how corrections allow reconstruction of snow accumulation rates over tens of thousands of years with little additional uncertainty. Glaciochemical and particulate data record atmospheric-loading changes with little uncertainty introduced by changes in snow accumulation. Confident paleothermometry is provided by site-specific calibrations using ice-isotopic ratios, borehole temperatures, and gas-isotopic ratios. Near-simultaneous changes in ice-core paleoclimatic indicators of local, regional, and more-widespread climate conditions demonstrate that much of the Earth experienced abrupt climate changes synchronous with Greenland within thirty years or less. Post-Younger Dryas changes have not duplicated the size, extent and rapidity of these paleoclimatic changes. (C) 1999 Elsevier Science Ltd. All rights reserved.