气候变化领域集成服务门户(CCPortal): Particle concentration and size distribution in the NGRIP ice core

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DOI	https://doi.org/10.1594/PANGAEA.107444
	Particle concentration and size distribution in the NGRIP ice core
	Ruth; Urs; Steffensen; Jørgen Peder; Bigler; Matthias
发布日期	2003-07-04
数据集类型	dataset
英文简介	A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5-100 kyr before present; measurements were at 1.65 m depth resolution, corresponding to approximately 35-200 yr. Particle concentration increased by a factor of 100 in the Last Glacial Maximum (LGM) compared to the Preboreal, and sharp variations of concentration occurred synchronously with rapid changes in the delta18O temperature proxy. The lognormal mode µ of the volume distribution shows clear systematic variations with smaller modes during warmer climates and coarser modes during colder periods. We find µ ~ 1.7 µm diameter during LGM and µ ~ 1.3 µm during the Preboreal. On timescales below several 100 years µ and the particle concentration exhibit a certain degree of independence present especially during warm periods, when µ generally is more variable. Using highly simplifying considerations for atmospheric transport and deposition of particles we infer that (1) the observed changes of µ in the ice largely reflect changes in the size of airborne particles above the ice sheet and (2) changes of µ are indicative of changes in long range atmospheric transport time. From the observed size changes we estimate shorter transit times by roughly 25% during LGM compared to the Preboreal. The associated particle concentration increase from more efficient long range transport is estimated to less than one order of magnitude.
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/214034
推荐引用方式 GB/T 7714	Ruth,Urs,Steffensen,et al. Particle concentration and size distribution in the NGRIP ice core.2003-07-04.https://doi.org/10.1594/PANGAEA.107444.