气候变化领域集成服务门户(CCPortal): Dust motion in snow microstructure

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.904568
	Dust motion in snow microstructure
	Hagenmuller; Pascal; Flin; Frederic; Dumont; Marie; Tuzet; François; Peinke; Isabel; Lapalus; Philippe; Dufour; Anne; Roulle; Jacques; Pezard; Laurent; Voisin; Didier; Ando; Edward; Rolland du Roscoat; Sabine; Charrier; Pascal
发布日期	2019-08-06
数据集类型	dataset
英文关键词	dust ; light-absorbing particles ; metamorphism ; microstructure ; snow
英文简介	The deposition of light-absorbing particles (LAPs) such as mineral dust and black carbon on snow is responsible for a highly effective climate forcing, through darkening of the snow surface and associated feedbacks. The interplay between post-depositional snow transformation (metamorphism) and the dynamics of LAPs in snow remains largely unknown. We obtained time series of X-ray tomography images of dust-contaminated samples undergoing dry snow metamorphism around -2°C. They provide the first observational evidence that temperature gradient metamorphism induces dust particle motion in snow, while no movement is observed under isothermal conditions. Under temperature gradient metamorphism, dust particles can enter the ice matrix due to sublimation-condensation processes and spread down mainly by falling into the pore space. Overall, such motions might reduce the radiative impact of dust in snow, in particular in arctic regions where temperature gradient metamorphism prevails.
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/215776
推荐引用方式 GB/T 7714	Hagenmuller,Pascal,Flin,et al. Dust motion in snow microstructure.2019-08-06.https://doi.org/10.1594/PANGAEA.904568.