气候变化领域集成服务门户(CCPortal): Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.693828
	Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model
	Huybrechts; Philippe; Rybak; Oleg; Pattyn; Frank; Ruth; Urs; Steinhage; Daniel
发布日期	2007-05-20
数据集类型	dataset
英文简介	A nested ice flow model was developed for eastern Dronning Maud Land to assist with the dating and interpretation of the EDML deep ice core. The model consists of a high-resolution higher-order ice dynamic flow model that was nested into a comprehensive 3-D thermomechanical model of the whole Antarctic ice sheet. As the drill site is on a flank position the calculations specifically take into account the effects of horizontal advection as deeper ice in the core originated from higher inland. First the regional velocity field and ice sheet geometry is obtained from a forward experiment over the last 8 glacial cycles. The result is subsequently employed in a Lagrangian backtracing algorithm to provide particle paths back to their time and place of deposition. The procedure directly yields the depth-age distribution, surface conditions at particle origin, and a suite of relevant parameters such as initial annual layer thickness. This paper discusses the method and the main results of the experiment, including the ice core chronology, the non-climatic corrections needed to extract the climatic part of the signal, and the thinning function. The focus is on the upper 89% of the ice core (appr. 170 kyears) as the dating below that is increasingly less robust owing to the unknown value of the geothermal heat flux. It is found that the temperature biases resulting from variations of surface elevation are up to half of the magnitude of the climatic changes themselves.
空间范围	Median Latitude: -75.138621 * Median Longitude: 2.829546 * South-bound Latitude: -75.282059 * West-bound Longitude: 0.070343 * North-bound Latitude: -75.002892 * East-bound Longitude: 6.470206
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/226942
推荐引用方式 GB/T 7714	Huybrechts,Philippe,Rybak,et al. Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model.2007-05-20.https://doi.org/10.1594/PANGAEA.693828.