A 1000-year high precision record of δ 13 C in atmospheric CO 2

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Tellus Series B-Chemical and Physical Meteorology Pub Date : 1999-04-01 DOI:10.3402/TELLUSB.V51I2.16269

R. Francey, R. Francey, C. Allison, D. Etheridge, C. Trudinger, C. Trudinger, I. Enting, I. Enting, M. Leuenberger, R. Langenfelds, E. Michel, L. Steele, L. Steele

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引用次数: 750

Abstract

We present measurements of the stable carbon isotope ratio in air extracted from Antarctic ice core and firn samples. The same samples were previously used by Etheridge and co-workers to construct a high precision 1000-year record of atmospheric CO 2 concentration, featuring a close link between the ice and modern records and high-time resolution. Here, we start by confirming the trend in the Cape Grim in situ δ 13 C record from 1982 to 1996, and extend it back to 1978 using the Cape Grim Air Archive. The firn air δ 13 C agrees with the Cape Grim record, but only after correction for gravitational separation at depth, for diffusion effects associated with disequilibrium between the atmosphere and firm, and allowance for a latidudinal gradient in δ 13 C between Cape Grim and the Antarctic coast. Complex calibration strategies are required to cope with several additional systematic influences on the ice core δ 13 C record. Errors are assigned to each ice core value to reflect statistical and systematic biases (between ± 0.025‰ and ± 0.07‰); uncertainties (of up to ± 0.05‰) between core-versus-core, ice-versus-firn and firn-versus-troposphere are described separately. An almost continuous atmospheric history of δ 13 C over 1000 years results, exhibiting significant decadal-to-century scale variability unlike that from earlier proxy records. The decrease in δ 13 C from 1860 to 1960 involves a series of steps confirming enhanced sensitivity of δ 13 C to decadal timescale-forcing, compared to the CO 2 record. Synchronous with a ‘‘Little Ice Age’′ CO 2 decrease, an enhancement of δ 13 C implies a terrestrial response to cooler temperatures. Between 1200 AD and 1600 AD, the atmospheric δ 13 C appear stable. DOI: 10.1034/j.1600-0889.1999.t01-1-00005.x

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大气co2中δ 13c的1000年高精度记录

我们提出了从南极冰芯和雪样品中提取的空气中稳定碳同位素比率的测量。埃瑟里奇和他的同事们以前用同样的样本建立了一个高精度的1000年大气二氧化碳浓度记录，其特点是冰和现代记录之间的密切联系和高时间分辨率。本文首先对格里姆角1982 ~ 1996年的δ 13c原位记录进行了趋势确认，并利用格里姆角大气档案将其回溯至1978年。大气δ 13c与格里姆角的记录一致，但只有在校正了深度重力分离、大气与大气不平衡引起的扩散效应以及格里姆角与南极海岸之间δ 13c的纬度梯度之后。为了应对对冰芯δ 13c记录的几个额外的系统影响，需要复杂的校准策略。为每个冰芯值分配误差，以反映统计和系统偏差(±0.025‰和±0.07‰之间);地核对地核、冰对雪和雪对对流层之间的不确定性(高达±0.05‰)分别进行了描述。在1000年的时间里，δ 13c的大气历史几乎是连续的，与早期的代用记录不同，它表现出显著的年代际-世纪尺度变化。从1860年到1960年，δ 13c的下降涉及一系列步骤，证实了与co2记录相比，δ 13c对年代际时间尺度强迫的敏感性增强。与“小冰期”二氧化碳减少同步，δ 13c的增强意味着陆地对较低温度的响应。公元1200 ~ 1600年，大气δ 13c趋于稳定。DOI: 10.1034 / j.1600 0889.1999.t01 - 1 - 00005. x

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来源期刊

Tellus Series B-Chemical and Physical Meteorology 地学-气象与大气科学

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期刊介绍： Tellus B: Chemical and Physical Meteorology along with its sister journal Tellus A: Dynamic Meteorology and Oceanography, are the international, peer-reviewed journals of the International Meteorological Institute in Stockholm, an independent non-for-profit body integrated into the Department of Meteorology at the Faculty of Sciences of Stockholm University, Sweden. Aiming to promote the exchange of knowledge about meteorology from across a range of scientific sub-disciplines, the two journals serve an international community of researchers, policy makers, managers, media and the general public.