气候变化领域集成服务门户(CCPortal): Annual means of delta 18O time series Colle Gnifetti ice cores

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.874205
	Annual means of delta 18O time series Colle Gnifetti ice cores
	Bohleber; Pascal; Wagenbach; Dietmar; Schöner; Wolfgang; Böhm; Reinhard
发布日期	2013-03-31
数据集类型	dataset
英文简介	Among Alpine ice core drilling sites, the Colle Gnifetti glacier saddle situated in the Monte Rosa summit range is the only one whose net snow accumulation rate is low enough to offer climate records back to some 1000 yr. It is demonstrated that the strong snow erosion at this site particularly hampers the interpretation of stable water isotope records d18O, dD in terms of atmospheric temperature changes. We evaluate the d18O records from four Colle Gnifetti cores for their common variability to extract a composite isotope record that may be compared with the instrumental temperature evidence. Time series analyses over the last 120 yr reveal that the common d18O signal is mainly reflected in the low frequency variability, starting at the decadal scale. Comparing the correspondingly smoothed composite record to the high-elevation temperature time series (specifically adjusted to the seasonality of the net snow accumulation) reveals the following findings: On the decadal scale, the isotope variability correlates with the temperature record at around R=0.65 but is interrupted by three, ca. 10-yr long mismatch periods. The multidecadal isotope signal closely reflects the strong overall 20th century temperature increase, thereby showing an up to three-fold higher isotope temperature sensitivity than commonly assumed. Over the entire instrumental period back to 1760, five more such mismatch periods are embedded in the generally coherent pattern of the d18O and instrumental temperature records (including the strong overestimate of the temperature around 1850 by the isotope temperature proxy). For the early instrumental period (1890-1760) characterized by a comparably weak long-term temperature trend, the isotope signal generally suggests warmer conditions of about 0.4°C compared to instrumental data.
空间范围	Median Latitude: 45.928880 * Median Longitude: 7.875452 * South-bound Latitude: 45.928190 * West-bound Longitude: 7.873650 * North-bound Latitude: 45.929720 * East-bound Longitude: 7.876960
时间范围	2005-08-28T00:00:00 - 2005-09-04T00:00:00
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/233539
推荐引用方式 GB/T 7714	Bohleber,Pascal,Wagenbach,et al. Annual means of delta 18O time series Colle Gnifetti ice cores.2013-03-31.https://doi.org/10.1594/PANGAEA.874205.