DOI: 10.1002/2013GL058635
论文题名: Vulnerability of shallow subarctic lakes to evaporate and desiccate when snowmelt runoff is low
作者: Bouchard F. ; Turner K.W. ; MacDonald L.A. ; Deakin C. ; White H. ; Farquharson N. ; Medeiros A.S. ; Wolfe B.B. ; Hall R.I. ; Pienitz R. ; Edwards T.W.D.
刊名: Geophysical Research Letters
ISSN: 0094-8345
EISSN: 1944-8076
出版年: 2013
卷: 40, 期: 23 起始页码: 6112
结束页码: 6117
语种: 英语
英文关键词: lakes
; snowmelt
; subarctic
; water isotopes
Scopus关键词: Ecological consequences
; Multiple sampling
; Snowmelt
; Source of waters
; subarctic
; Surface sediments
; Terrestrial vegetation
; Water isotope
; Catchments
; Driers (materials)
; Ecology
; Isotopes
; Landforms
; Runoff
; Snow
; Snow melting systems
; Lakes
; cellulose
; desiccation
; lake water
; runoff
; sampling
; snowmelt
; tundra
; vegetation cover
; Canada
; Hudson Bay Lowlands
; Manitoba
; Old Crow Flats
; Yukon Territory
英文摘要: Snowmelt is a crucial source of water for many shallow subarctic lakes, but climate models predict that snowfall will decrease in some regions, with profound ecological consequences. Here we use lake water isotope data across gradients of terrestrial vegetation cover (open tundra to closed forest) and topographic relief to identify lakes that are vulnerable to desiccation under conditions of low snowmelt runoff in two subarctic landscapes - Old Crow Flats, Yukon, and Hudson Bay Lowlands, Manitoba (Canada). Lakes located in low-relief, open tundra catchments in both landscapes displayed a systematic, positive offset between directly measured lake water δ18O over multiple sampling campaigns and lake water δ18O inferred from cellulose in recently deposited surface sediments. We attribute this offset to a strong evaporative 18O-enrichment response to lower-than-average snowmelt runoff in recent years. Notably, some lakes underwent near-complete desiccation during midsummer 2010 following a winter of very low snowfall. Based on the paleolimnological record of one such lake, the extremely dry conditions in 2010 may be unprecedented in the past ~200 years. Findings fuel concerns that a decrease in snowmelt runoff will lead to widespread desiccation of shallow lakes in these landscapes. Key Points Desiccation of shallow tundra lakes may occur when snowmelt is low Recent desiccation appears to be unprecedented over the past ~200 years Increasing frequency of lake desiccation will have ecological consequences ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84889023379&doi=10.1002%2f2013GL058635&partnerID=40&md5=b05b3afa47a357914d7df7d8c2368ab4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5609
Appears in Collections: 气候减缓与适应
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作者单位: Département de Géographie, Centre d'Études Nordiques, Université Laval Québec, 2405 rue de la Terrasse, Québec, QC G1V 0A6, Canada
Recommended Citation:
Bouchard F.,Turner K.W.,MacDonald L.A.,et al. Vulnerability of shallow subarctic lakes to evaporate and desiccate when snowmelt runoff is low[J]. Geophysical Research Letters,2013-01-01,40(23).