globalchange  > 气候变化与战略
CSCD记录号: CSCD:6028206
论文题名:
末次冰消期气候驱动机制研究全球末次冰消期冰川~(10)Be暴露测年综述
其他题名: Climate mechanism of the Last Glacial Termination A review of the ~(10)Be surface exposure about dating the last deglaciation
作者: 李明1; 周杰1; 张丽1; 晏宏1; 董国成1
刊名: 地球环境学报
ISSN: 1674-9901
出版年: 2017
卷: 8, 期:3, 页码:316-323
语种: 中文
中文关键词: ~(10)Be暴露年龄 ; 末次冰消期 ; 北大西洋冰筏事件 ; 太阳辐射
英文关键词: ~(10)Be surface exposure dating ; last deglaciation ; North Atlantic ice-rafting events ; solar insolation
WOS学科分类: GEOLOGY
WOS研究方向: Geology
中文摘要: 在第四纪冰期 - 间冰期的旋回中,寒冷气候的回暖经历了一个长时间过程,而冰消期的时间则相对较短。原地宇宙成因核素~(10)Be可以得到冰川退缩后冰碛物的暴露年龄从而揭示冰期 - 间冰期演化历史。本文初步总结了末次冰消期附近以~(10)Be暴露测年获得的冰川退却年代,并据此简要讨论末次冰消期的演化过程和驱动机制,包括太阳辐射和北半球巨大冰盖在末次冰消期启动过程中的作用,及其随后崩塌的冰筏对全球海洋和大气环流模式的影响,冰盖融化、海洋上涌产生温室气体与多个正反馈共同推动了冰期的结束。
英文摘要: Background, aim, and scope This review deals with publications concerning the ~(10)Be surface exposure dating about the Last Glacial Termination. At the peak of the last ice age, expansive ice sheets covered large areas of the Northern Hemisphere. The reduction of this continental ice to about its present volume represents one of the largest and most rapid natural climate changes in Earths recent history. As a consequence, identifying the conditions and processes that triggered this deglaciation has been a major objective of paleoclimate research. Materials and methods The review shows the representative changes in the volume of continental ice throughout the Late Pleistocene. ~(10)Be surface exposure dating showing the schematic spatial extent of continental ice sheet at the Last Glacial Termination. Two large ice sheets survived the last termination. One is in Greenland and the other in Antarctica. This review emphasizes the proximity of the Laurentide and European ice sheets to areas of deepwater formation in the North Atlantic Ocean. In the North Atlantic, ice-rafting events indicate the supply of freshwater and icebergs. On the Southern Ocean, the extent of winter sea ice indicates the pattern of the NorthSouth Connections. Results Several publications have been identified show that certain factors and synergism can impact mechanism on and process of the last deglaciation. The ice sheets amount and rate of insolation rise may be important controls on terminations. As a result, Terminations invariably shows began when were at or close the maximum in the rate of insolation rise and their greatest area and volume. Discussion Research on the underlying mechanism of ~(10)Be surface exposure about dating the last deglaciation might help to explain some of the effects found in the termination with multiple feedbacks. In general, the rising insolation triggers the initial disintegration of a massive, isostatically compensated ice sheet, which in turn triggers a slowing of meridional overturning circulation (MOC) and hence a lowering of surface-ocean heat flux to the North Atlantic. Along with sea-ice formation, this collapse generates a cold anomaly in the North Atlantic, which weakens the Asian Monsoon through atmospheric teleconnections and also moves the Intertropical Convergence Zone (ITCZ) to the south. Antarctic temperature increase could result from CO_2 rise, from the bipolar seesaw mechanism, and from southward shifts in atmospheric circulation patterns. Conclusions On the basis of review data, the exposed ages for glacial retreats dated by ~(10)Be during the last glacial termination over the world has been reviewed and the process and mechanismon how the last global ice age terminated. North Hemisphere summer insolation intensity and the growth of ice sheet over Northern Hemisphere triggerred the initial retreat of northern ice sheets. Melt water and icebergs entering the North Atlantic altered oceanic and atmospheric circulation and associated fluxes of heat and carbon, causing increases in atmospheric CO_2 and Antarctic temperatures. Both rising insolation and CO_2 concentration drove the termination with multiple positive feedbacks. Recommendations and perspectives If the review is any indication, we have surely not realized the full role of ~(10)Be surface exposure dating characterization in the last deglaciation. Developments in ~(10)Be surface exposure dating methods are improving the reliability of landscape evolution, glaciation, and paleoclimate interpretations. As more applications are discovered, Quaternary geologists are beginning to address questions that had never before been asked.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/152266
Appears in Collections:气候变化与战略

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作者单位: 1.中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室
2.陕西省加速器质谱技术及应用重点实验室, 西安, 陕西 710061, 中国

Recommended Citation:
李明,周杰,张丽,等. 末次冰消期气候驱动机制研究全球末次冰消期冰川~(10)Be暴露测年综述[J]. 地球环境学报,2017-01-01,8(3):316-323
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