DOI: 10.1111/gcb.12759
论文题名: Pronounced chemical response of Subarctic lakes to climate-driven losses in surface area
作者: Lewis T.L. ; Lindberg M.S. ; Schmutz J.A. ; Heglund P.J. ; Rover J. ; Koch J.C. ; Bertram M.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 3 起始页码: 1140
结束页码: 1152
语种: 英语
英文关键词: Aquatic nutrients
; Eutrophication
; Evapoconcentration
; Permafrost
; Shrinking lakes
; Subarctic
; Water chemistry
Scopus关键词: concentration (composition)
; eutrophication
; global change
; lake ecosystem
; nutrient cycling
; permafrost
; shrinkage
; subarctic region
; water chemistry
; Alaska
; United States
; Yukon Flats
; nitrogen
; phosphorus
; Arctic
; chemistry
; climate change
; environmental monitoring
; lake
; season
; United States
; Alaska
; Arctic Regions
; Climate Change
; Environmental Monitoring
; Lakes
; Nitrogen
; Phosphorus
; Seasons
英文摘要: Losses in lake area have been observed for several Arctic and Subarctic regions in recent decades, with unknown consequences for lake ecosystems. These reductions are primarily attributed to two climate-sensitive mechanisms, both of which may also cause changes in water chemistry: (i) increased imbalance of evaporation relative to inflow, whereby increased evaporation and decreased inflow act to concentrate solutes into smaller volumes; and (ii) accelerated permafrost degradation, which enhances sublacustrine drainage while simultaneously leaching previously frozen solutes into lakes. We documented changes in nutrients [total nitrogen (TN), total phosphorus (TP)] and ions (calcium, chloride, magnesium, sodium) over a 25 year interval in shrinking, stable, and expanding Subarctic lakes of the Yukon Flats, Alaska. Concentrations of all six solutes increased in shrinking lakes from 1985-1989 to 2010-2012, while simultaneously undergoing little change in stable or expanding lakes. This created a present-day pattern, much weaker or absent in the 1980s, in which shrinking lakes had higher solute concentrations than their stable or expanding counterparts. An imbalanced evaporation-to-inflow ratio (E/I) was the most likely mechanism behind such changes; all four ions, which behave semiconservatively and are prone to evapoconcentration, increased in shrinking lakes and, along with TN and TP, were positively related to isotopically derived E/I estimates. Moreover, the most conservative ion, chloride, increased >500% in shrinking lakes. Conversely, only TP concentration was related to probability of permafrost presence, being highest at intermediate probabilities. Overall, the substantial increases of nutrients (TN >200%, TP >100%) and ions (>100%) may shift shrinking lakes towards overly eutrophic or saline states, with potentially severe consequences for ecosystems of northern lakes. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61784
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology and Wildlife and Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States; U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska, United States; U.S. Fish and Wildlife Service, 2630 Fanta Reed Road, La Crosse, WI, United States; U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center, 47914 252nd Street, Sioux Falls, SD, United States; U.S. Fish and Wildlife Service, Yukon Flats National Wildlife Refuge, 101 12th Avenue, Fairbanks, AK, United States
Recommended Citation:
Lewis T.L.,Lindberg M.S.,Schmutz J.A.,et al. Pronounced chemical response of Subarctic lakes to climate-driven losses in surface area[J]. Global Change Biology,2015-01-01,21(3)