气候变化领域集成服务门户(CCPortal): Continuous density log of icecore BER11C95

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.227732
	Continuous density log of icecore BER11C95_25
	Gerland; Sebastian; Wilhelms; Frank
发布日期	1999-09-28
数据集类型	dataset
英文简介	A 181 m long ice core was drilled at 79° 36' 51'' S, 45° 43' 28'' W, near the summit of Berkner Island, Antarctica 886 m a.s.l.). Berkner Island is located within the Filchner and Ronne Ice Shelves, and the ice near the summit shows little lateral flow. The density of the ice core was measured every 3 mm along ist length, using attenuation of a gamma-ray beam, which gave an absolute accuracy of 2%. As expected, there is a general density increase with depth, the maximum densities of > 900 kg/m**3 being reached just above 100 m depth. Comparison with electrical conductivity method (ECM) shows density variations with the same wavelength as annual signals, which can be seen in the ECM log (higher acidity during summer). In the shallowest part of the core, the density of winter layers is higher than that of summer layers, a relationship which is reversed at greater depth. We assume that the densification rates for the two types of firn are different. Similar density phenomena were observed on ice cores from Greenland, showing that such phenomena are not a local effect.
空间范围	Latitude: -79.614160 * Longitude: -45.724330
时间范围	1995-02-08T00:00:00 - 1995-02-08T00:00:00
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/213990
推荐引用方式 GB/T 7714	Gerland,Sebastian,Wilhelms,et al. Continuous density log of icecore BER11C95_25.1999-09-28.https://doi.org/10.1594/PANGAEA.227732.