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DOI	10.1130/B35479.1
	Geochemistry of contrasting stream types, Taylor Valley, Antarctica
	Harmon, Russell S.; Leslie, Deborah L.; Lyons, W. Berry; Welch, Kathleen A.; McKnight, Diane M.
通讯作者	Harmon, RS (corresponding author), North Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA.
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN	0016-7606
EISSN	1943-2674
出版年	2021
卷号	133 期号:1-2 页码:425-448
英文摘要	The McMurdo Dry Valley region is the largest ice-free area of Antarctica. Ephemeral streams flow here during the austral summer, transporting glacial meltwater to perennially ice-covered, closed basin lakes. The chemistry of 24 Taylor Valley streams was examined over the two-decade period of monitoring from 1993 to 2014, and the geochemical behavior of two streams of contrasting physical and biological character was monitored across the seven weeks of the 2010-2011 flow season. Four species dominate stream solute budgets: HCO3-, Ca2+, Na+, and Cl-, with SO42-, Mg2+, and K+ present in significantly lesser proportions. All streams contain dissolved silica at low concentrations. Across Taylor Valley, streams are characterized by their consistent anionic geochemical fingerprint of HCO3 > Cl > SO4, but there is a split in cation composition between 14 streams with Ca > Na > Mg > K and 10 streams with Na > Ca > Mg > K. Andersen Creek is a first-order proglacial stream representative of the 13 short streams that flow <1.5 km from source to gage. Von Guerard is representative of 11 long streams 2-7 km in length characterized by extensive hyporheic zones. Both streams exhibit a strong daily cycle for solute load, temperature, dissolved oxygen, and pH, which vary in proportion to discharge. A well-expressed diurnal co-variation of pH with dissolved oxygen is observed for both streams that reflects different types of biological control. The relative consistency of Von Guerard composition over the summer flow season reflects chemostatic regulation, where water in transient storage introduced during times of high streamflow has an extended opportunity for water-sediment interaction, silicate mineral dissolution, and pore-water exchange.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000618060000029
WOS关键词	MCMURDO DRY VALLEYS ; GLACIAL MELTWATER STREAMS ; SOUTHERN VICTORIA LAND ; HYPORHEIC EXCHANGE ; CRYOCONITE HOLES ; FRYXELL BASIN ; POLAR DESERT ; ROSS SEA ; HYDROLOGIC CONNECTIVITY ; CO2 CONSUMPTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350397
作者单位	[Harmon, Russell S.] North Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA; [Leslie, Deborah L.] Univ Memphis, Dept Earth Sci, Memphis, TN 38152 USA; [Lyons, W. Berry] Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA; [Lyons, W. Berry] Ohio State Univ, Byrd Polar & Climate Res Ctr, Columbus, OH 43210 USA; [Welch, Kathleen A.; McKnight, Diane M.] Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA
推荐引用方式 GB/T 7714	Harmon, Russell S.,Leslie, Deborah L.,Lyons, W. Berry,et al. Geochemistry of contrasting stream types, Taylor Valley, Antarctica[J],2021,133(1-2):425-448.
APA	Harmon, Russell S.,Leslie, Deborah L.,Lyons, W. Berry,Welch, Kathleen A.,&McKnight, Diane M..(2021).Geochemistry of contrasting stream types, Taylor Valley, Antarctica.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,133(1-2),425-448.
MLA	Harmon, Russell S.,et al."Geochemistry of contrasting stream types, Taylor Valley, Antarctica".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 133.1-2(2021):425-448.