气候变化领域集成服务门户(CCPortal): Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.882249
	Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area
	Parrenin; Frédéric; Cavitte; Marie G P; Blankenship; Donald D; Chappellaz; Jérôme A; Fischer; Hubertus; Gagliardini; Olivier; Masson-Delmotte; Valerie; Passalacqua; Olivier; Ritz; Catherine; Roberts; Jason L; Siegert; Martin J; Young; Duncan A
发布日期	2017-10-30
数据集类型	dataset
英文简介	Ice sheets provide exceptional archives of past changes in polar climate, regional environment and global atmospheric composition. The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ~800,000 years. Obtaining an older paleoclimatic record from Antarctica is one of the greatest challenges of the ice core community. Here, we use internal isochrones, identified from airborne radar coupled to ice-flow modelling to estimate the age of basal ice along transects in the Dome C area. Three glaciological properties are inverted from isochrones: surface accumulation rate; geothermal flux; and the exponent of the Lliboutry velocity profile. We find that old ice (>1 Myr, 1 million years) likely exists in two regions: one ~40 km south-west of Dome C along the ice divide to Vostok, close to a secondary dome that we name "Little Dome C" (LDC); and a second region named "North Patch" (NP) located 10-30 km north-east of Dome C, in a region where the geothermal flux is apparently relatively low. Our work demonstrates the value of combining radar observations with ice flow modelling to accurately represent the true nature of ice flow, and the formation of ice-sheet architecture, in the centre of large ice sheets.
空间范围	Median Latitude: -75.501334 * Median Longitude: 121.726843 * South-bound Latitude: -77.048737 * West-bound Longitude: 112.418242 * North-bound Latitude: -73.770612 * East-bound Longitude: 127.557975
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/216405
推荐引用方式 GB/T 7714	Parrenin,Frédéric,Cavitte,et al. Basal age, surface accumulation, basal melting, geothermal flux and Lliboutry exponent of the velocity profile in the Dome C area.2017-10-30.https://doi.org/10.1594/PANGAEA.882249.