气候变化领域集成服务门户(CCPortal): Stable carbon isotope ratios of carbon dioxide from EDC and Berkner Island ice cores for 40-50 ka BP

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.809527
	Stable carbon isotope ratios of carbon dioxide from EDC and Berkner Island ice cores for 40-50 ka BP
	Schaefer; Hinrich; Lourantou; Anna; Chappellaz; Jérôme A; Lüthi; Dieter; Bereiter; Bernhard; Barnola; Jean-Marc
发布日期	2011-04-03
数据集类型	dataset
英文简介	The stable carbon isotopic signature of carbon dioxide (d13CO2) measured in the air occlusions of polar ice provides important constraints on the carbon cycle in past climates. In order to exploit this information for previous glacial periods, one must use deep, clathrated ice, where the occluded air is preserved not in bubbles but in the form of air hydrates. Therefore, it must be established whether the original atmospheric d13CO2 signature can be reconstructed from clathrated ice. We present a comparative study using coeval bubbly ice from Berkner Island and ice from the bubble-clathrate transformation zone (BCTZ) of EPICA Dome C (EDC). In the EDC samples the gas is partitioned into clathrates and remaining bubbles as shown by erroneously low and scattered CO2 concentration values, presenting a worst-case test for d13CO2 reconstructions. Even so, the reconstructed atmospheric d13CO2 values show only slightly larger scatter. The difference to data from coeval bubbly ice is statistically significant. However, the 0.16 per mil magnitude of the offset is small for practical purposes, especially in light of uncertainty from non-uniform corrections for diffusion related fractionation that could contribute to the discrepancy. Our results are promising for palaeo-atmospheric studies of d13CO2 using a ball mill dry extraction technique below the BCTZ of ice cores, where gas is not subject to fractionation into microfractures and between clathrate and bubble reservoirs.
空间范围	Median Latitude: -77.325000 * Median Longitude: 38.833335 * South-bound Latitude: -79.550000 * West-bound Longitude: -45.683330 * North-bound Latitude: -75.100000 * East-bound Longitude: 123.350000
时间范围	1993-01-01T00:00:00 - 2004-12-31T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	冰冻圈
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/213768
推荐引用方式 GB/T 7714	Schaefer,Hinrich,Lourantou,et al. Stable carbon isotope ratios of carbon dioxide from EDC and Berkner Island ice cores for 40-50 ka BP.2011-04-03.https://doi.org/10.1594/PANGAEA.809527.