气候变化领域集成服务门户(CCPortal): Microscale spatial variability of snowpack: isotopic and chemical heterogeneity of a firn pack at Qomolangma (Mount Everest), central Himalaya

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DOI	10.3189/172756408787814744
	Microscale spatial variability of snowpack: isotopic and chemical heterogeneity of a firn pack at Qomolangma (Mount Everest), central Himalaya
	Zhou, Shiqiao; Kang, Shichang; Cong, Zhiyuan
发表日期	2008
ISSN	0260-3055
起始页码	173
结束页码	178
卷号	49
英文摘要	For a better understanding of snow metamorphosing processes and more precise snow-ice-core interpretations, it is necessary to know the extent of microscale spatial variability of isotopic and chemical distributions in a snowpack. This work presents an investigation on the horizontal heterogeneity of the isotopic and chemical distributions in a firn pack on East Rongbuk Glacier at Qomolangma (Mount Everest), central Himalaya. One pit wall of 1.2 x 1.2 m(2) at 6520 ma.s.l. was sampled at intervals of 10 cm in a matrix pattern with a total of 144 samples collected. All the samples were analyzed for delta O-18 and ionic concentrations. Small horizontal isotopic and large chemical heterogeneities were found. The averaged coefficient of variation (CV) of the twelve 10 cm thick layers for delta O-18 is 0.052, and in the whole snow thickness of 120cm it is 0.016, which is in the range of analytic precision and thus indicates complete homogeneity. However, the ionic distribution shows considerable heterogeneity. The averaged CV values of the 10cm thick layers for ionic concentrations vary in the range 0.628-1.477 depending on the ions. Based on these CV values, the heterogeneity sequence is: Mg2+ > Ca2+ > K+ > Na+ > Cl- > SO42- > PO43- > NO3- > NH4+. The averaged CV values for all the ions, except for NH4+, decrease with increasing snow thickness, although the decreasing rates and extents are different. However, the CV values of different ions are still large and in the range 0.183-1.116 when the snow thickness increases to 120cm. The heterogeneity sequence becomes: K+ > Mg2+ > Ca2+ > NH4+ > Na+ > Cl- > PO43- > NO3- > SO42-. The CV average change with thickness is different for NH4+. From 20 to 100cm it increases slightly with increasing thickness, but all the values are lower than the average of 10cm thick layers.
关键词	EASTERN TIEN-SHAN GLACIER NO. 1 SOLUTE TRANSPORT FRACTIONATION MELTWATER EVOLUTION ELUTION
学科领域	Geology
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000264862900028
来源期刊	ANNALS OF GLACIOLOGY, VOL 49, 2008
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111518
推荐引用方式 GB/T 7714	Zhou, Shiqiao,Kang, Shichang,Cong, Zhiyuan. Microscale spatial variability of snowpack: isotopic and chemical heterogeneity of a firn pack at Qomolangma (Mount Everest), central Himalaya[J]. 中国科学院青藏高原研究所,2008,49.
APA	Zhou, Shiqiao,Kang, Shichang,&Cong, Zhiyuan.(2008).Microscale spatial variability of snowpack: isotopic and chemical heterogeneity of a firn pack at Qomolangma (Mount Everest), central Himalaya.ANNALS OF GLACIOLOGY, VOL 49, 2008,49.
MLA	Zhou, Shiqiao,et al."Microscale spatial variability of snowpack: isotopic and chemical heterogeneity of a firn pack at Qomolangma (Mount Everest), central Himalaya".ANNALS OF GLACIOLOGY, VOL 49, 2008 49(2008).