气候变化领域集成服务门户(CCPortal): Carbon dioxide concentrations for the Last Millennium, Antarctica

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.728135
	Carbon dioxide concentrations for the Last Millennium, Antarctica
	Siegenthaler; Urs; Monnin; Eric; Kawamura; Kenji; Spahni; Renato; Schwander; Jakob; Stauffer; Bernhard; Stocker; Thomas F; Barnola; Jean-Marc; Fischer; Hubertus
发布日期	2005-09-28
数据集类型	dataset
英文简介	The most direct method of investigating past variations of the atmospheric CO2 concentration before 1958, when continuous direct atmospheric CO2 measurements started, is the analysis of air extracted from suitable ice cores. Here we present a new detailed CO2 record from the Dronning Maud Land (DML) ice core, drilled in the framework of the European Project for Ice Coring in Antarctica (EPICA) and some new measurements on a previously drilled ice core from the South Pole. The DML CO2 record shows an increase from about 278 to 282 parts per million by volume (ppmv) between ad 1000 and ad 1200 and a fairly continuous decrease to a mean value of about 277 ppmv around ad 1700. While the new South Pole measurements agree well with DML at the minimum at ad 1700 they are on average about 2 ppmv lower during the period ad 1000-1500. Published measurements from the coastal high-accumulation site Law Dome are considered as very reliable because of the reproducibility of the measurements, high temporal resolution and an accurate time scale. Other Antarctic ice cores could not, or only partly, reproduce the pre-industrial measurements from Law Dome. A comparison of the trends of DML and Law Dome shows a general agreement. However we should be able to rule out co-variations caused by the same artefact. Two possible effects are discussed, first production of CO2 by chemical reactions and second diffusion of dissolved air through the ice matrix into the bubbles. While the first effect cannot be totally excluded, comparison of the Law Dome and DML record shows that dissolved air diffusing to bubbles cannot be responsible for the pre-industrial variation. Therefore, the new record is not a proof of the Law Dome results but the first very strong support from an ice core of the Antarctic plateau.
空间范围	Median Latitude: -82.501250 * Median Longitude: 0.034200 * South-bound Latitude: -90.000000 * West-bound Longitude: 0.000000 * North-bound Latitude: -75.002500 * East-bound Longitude: 0.068400
时间范围	2001-01-10T00:00:00 - 2006-01-17T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/226938
推荐引用方式 GB/T 7714	Siegenthaler,Urs,Monnin,et al. Carbon dioxide concentrations for the Last Millennium, Antarctica.2005-09-28.https://doi.org/10.1594/PANGAEA.728135.