Long‐term variability in the global carbon cycle inferred from a high‐precision CO2 and δ13C ice‐core record

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.V51I2.16276
C. Trudinger, I. Enting, R. Francey, D. Etheridge, P. Rayner
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引用次数: 85

Abstract

The new high precision Law Dome ice core record of CO 2 and δ 13 CO 2 is used with a 1-D global carbon cycle model to investigate natural variability in the carbon cycle and the anthropogenic CO 2 perturbation, focusing on variations on time-scales of centuries. A major feature of the ice core record is the decrease in CO 2 , and increase in δ 13 C, through the ‘‘Little Ice Age’′ period (roughly 1550–1800). We show that this observed decrease in CO 2 is consistent with the effect of decreased temperature on either terrestrial or oceanic exchange, however the increase in δ 13 C favors a terrestrial response to cooling. We perform single deconvolution model calculations which generally give good agreement with observed variations in CO 2 , δ 13 C and Δ 14 C data for different reservoirs and due to both natural and anthropogenic causes. The fit to prebomb Δ 14 C is improved by using an ice core 10 Be record to represent the natural production of 14 C due to cosmic rays, however, the uncertainties in interpreting the 10 Be are as yet too large to use prebomb Δ 14 C to better constrain the model parameters. DOI: 10.1034/j.1600-0889.1999.t01-1-00009.x
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从高精度CO2和δ13C冰芯记录推断的全球碳循环的长期变率
利用新的高精度Law Dome冰芯CO 2和δ 13 CO 2记录与一维全球碳循环模型,研究了碳循环的自然变率和人为CO 2扰动,重点研究了世纪尺度上的变化。冰芯记录的一个主要特征是在“小冰期”(大约1550-1800年)期间CO 2的减少和δ 13c的增加。我们表明,观测到的CO 2的减少与温度下降对陆地或海洋交换的影响是一致的,但是δ 13c的增加有利于陆地对冷却的响应。我们进行了单一反褶积模型计算,通常与观测到的不同储层的CO 2、δ 13c和Δ 14c数据的变化相吻合,这些变化是由自然和人为原因引起的。通过使用冰芯10be记录来表示宇宙射线引起的14c的自然产生,可以改善对预爆Δ 14c的拟合,然而,解释10be的不确定性仍然太大,无法使用预爆Δ 14c来更好地约束模型参数。DOI: 10.1034 / j.1600 0889.1999.t01 - 1 - 00009. x
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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.
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