气候变化领域集成服务门户(CCPortal): Two-way traveltimes of internal layers and ice thickness between Dome C - Vostok

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.836120
	Two-way traveltimes of internal layers and ice thickness between Dome C - Vostok - Dome A
	Sun; Bo; Moore; John C; Zwinger; Thomas; Zhao; Liyun; Steinhage; Daniel; Tang; Xueyuan; Zhang; Dong; Cui; Xiangbin; Martín; Carlos
发布日期	2014-09-22
数据集类型	dataset
英文简介	Chinese scientists will start to drill a deep ice core at Kunlun station near Dome A in the near future. Recent work has predicted that Dome A is a location where ice older than 1 million years can be found. We model flow, temperature and the age of the ice by applying a three-dimensional, thermomechanically coupled full-Stokes model to a 70 × 70 km**2 domain around Kunlun station, using isotropic non-linear rheology and different prescribed anisotropic ice fabrics that vary the evolution from isotropic to single maximum at 1/3 or 2/3 depths. The variation in fabric is about as important as the uncertainties in geothermal heat flux in determining the vertical advection which in consequence controls both the basal temperature and the age profile. We find strongly variable basal ages across the domain since the ice varies greatly in thickness, and any basal melting effectively removes very old ice in the deepest parts of the subglacial valleys. Comparison with dated radar isochrones in the upper one third of the ice sheet cannot sufficiently constrain the age of the deeper ice, with uncertainties as large as 500 000 years in the basal age. We also assess basal age and thermal state sensitivities to geothermal heat flux and surface conditions. Despite expectations of modest changes in surface height over a glacial cycle at Dome A, even small variations in the evolution of surface conditions cause large variation in basal conditions, which is consistent with basal accretion features seen in radar surveys.
空间范围	Median Latitude: -78.157665 * Median Longitude: 103.697581 * South-bound Latitude: -80.735703 * West-bound Longitude: 77.099899 * North-bound Latitude: -75.059700 * East-bound Longitude: 123.713402
时间范围	2008-01-20T00:00:00 - 2008-01-20T00:00:00
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/215487
推荐引用方式 GB/T 7714	Sun,Bo,Moore,et al. Two-way traveltimes of internal layers and ice thickness between Dome C - Vostok - Dome A.2014-09-22.https://doi.org/10.1594/PANGAEA.836120.