气候变化领域集成服务门户(CCPortal): (Table 1) Two-way travel times and depths of picked internal reflection horizons (IRHs) of the NGRIP ice core

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.855197
	(Table 1) Two-way travel times and depths of picked internal reflection horizons (IRHs) of the NGRIP ice core
	Steinhage; Daniel; Eisen; Olaf; Clausen; Henrik Brink
发布日期	2005-11-24
数据集类型	dataset
英文简介	During the summer of 2003, a ground-penetrating radar survey around the North Greenland Icecore Project (NorthGRIP) deep ice-core drilling site (75°06' N, 42°20' W; 2957 m a.s.l.) was carried out using a shielded 250 MHz radar system. The drill site is located on an ice divide, roughly 300 km north-northwest of the summit of the Greenland ice sheet. More than 430 km of profiles were measured, covering a 10 km by 10 km area, with a grid centered on the drilling location, and eight profiles extending beyond this grid. Seven internal horizons within the upper 120 m of the ice sheet were continuously tracked, containing the last 400 years of accumulation history. Based on the age-depth and density-depth distribution of the deep core, the internal layers have been dated and the regional and temporal distribution of accumulation rate in the vicinity of NorthGRIP has been derived. The distribution of accumulation shows a relatively smoothly increasing trend from east to west from 145 kg/m2/a to 200 kg/m2/a over a distance of 50 km across the ice divide. The general trend is overlain by small-scale variations on the order of 2.5 kg/m2/a/km, i.e. around 1.5% of the accumulation mean. The temporal variations of the seven periods defined by the seven tracked isochrones are on the order of +-4% of the mean of the last 400 years, i.e. at NorthGRIP ±7 kg/m2/a. If the regional accumulation pattern has been stable for the last several thousand years during the Holocene, and ice flow has been comparable to today, advective effects along the particle trajectory upstream of NorthGRIP do not have a significant effect on the interpretation of climatically induced changes in accumulation rates derived from the deep ice core over the last 10 kyr.
空间范围	Latitude: 75.100000 * Longitude: -42.320000
时间范围	1996-07-01T00:00:00 - 1996-07-01T00:00:00
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/213756
推荐引用方式 GB/T 7714	Steinhage,Daniel,Eisen,et al. (Table 1) Two-way travel times and depths of picked internal reflection horizons (IRHs) of the NGRIP ice core.2005-11-24.https://doi.org/10.1594/PANGAEA.855197.