在格陵兰冰上测量14CH4:调查最后一次冰川结束的CH4来源
Vasilii V Petrenko1, Andrew M Smith, Edward J Brook
1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA. vasilii.petrenko@colorado.edu
Science (New York, N.Y.)
|April 25, 2009
概括
11,600年前,在气候变化期间,甲水平急剧上升. 格陵兰冰层中甲 (14CH4) 中的碳-14 的新分析表明湿地,而不是酸盐,是主要来源.
科学领域:
- 古气候学 古气候学
- 大气化学 大气化学
- 地质化学 地质化学
背景情况:
- 年轻的德里亚斯-前北极过渡时期,大气中甲的含量显著增加.
- 区分甲来源 (湿地与酸盐) 对于了解过去的气候动态至关重要.
研究的目的:
- 为了调查大气甲增加的来源,在年轻的干旱-前北极过渡期间.
- 利用碳-14 (14C) 在甲 (14CH4) 中的测量来区分潜在的来源.
主要方法:
- 在格陵兰西部的冰川冰样中分析14CH4,特别针对新德里亚斯-前北极时期.
- 在一氧化碳 (14C CO) 中测量碳-14,以评估和纠正冰中的宇宙 14C 生产.
主要成果:
- 冰样中的初始14CH4测量结果出乎意料地高.
- 冰中的宇宙性14C生产被确定为14CH4.4升高的来源.
- 在对宇宙效应进行校正后,数据显示湿地甲来源的贡献占主导地位.
结论:
- 湿地排放可能是年轻德里亚斯 - 前北极过渡期间大气中甲增加的主要驱动因素.
- 在从剥离地点的冰川样本中分析14CH4时,必须考虑冰中的宇宙 14C 生产.
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