DOI: 10.1111/gcb.12757
论文题名: Polygonal tundra geomorphological change in response to warming alters future CO2 and CH4 flux on the Barrow Peninsula
作者: Lara M.J. ; Mcguire A.D. ; Euskirchen E.S. ; Tweedie C.E. ; Hinkel K.M. ; Skurikhin A.N. ; Romanovsky V.E. ; Grosse G. ; Bolton W.R. ; Genet H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 4 起始页码: 1634
结束页码: 1651
语种: 英语
英文关键词: Arctic
; Carbon balance
; Classification
; Climate warming
; Negative feedback
; Polygonal tundra
; Thaw-lake cycle
; Thermokarst
Scopus关键词: carbon balance
; carbon flux
; geomorphological response
; global warming
; landscape change
; methane
; thermokarst
; tundra
; Alaska
; Arctic
; Barrow
; United States
; carbon dioxide
; methane
; soil
; Alaska
; Arctic
; carbon cycle
; chemistry
; climate change
; geographic and geological phenomena
; season
; soil
; tundra
; Alaska
; Arctic Regions
; Carbon Cycle
; Carbon Dioxide
; Climate Change
; Geological Processes
; Methane
; Seasons
; Soil
; Tundra
英文摘要: The landscape of the Barrow Peninsula in northern Alaska is thought to have formed over centuries to millennia, and is now dominated by ice-wedge polygonal tundra that spans drained thaw-lake basins and interstitial tundra. In nearby tundra regions, studies have identified a rapid increase in thermokarst formation (i.e., pits) over recent decades in response to climate warming, facilitating changes in polygonal tundra geomorphology. We assessed the future impact of 100 years of tundra geomorphic change on peak growing season carbon exchange in response to: (i) landscape succession associated with the thaw-lake cycle; and (ii) low, moderate, and extreme scenarios of thermokarst pit formation (10%, 30%, and 50%) reported for Alaskan arctic tundra sites. We developed a 30 × 30 m resolution tundra geomorphology map (overall accuracy:75%; Kappa:0.69) for our ~1800 km2 study area composed of ten classes; drained slope, high center polygon, flat-center polygon, low center polygon, coalescent low center polygon, polygon trough, meadow, ponds, rivers, and lakes, to determine their spatial distribution across the Barrow Peninsula. Land-atmosphere CO2 and CH4 flux data were collected for the summers of 2006-2010 at eighty-two sites near Barrow, across the mapped classes. The developed geomorphic map was used for the regional assessment of carbon flux. Results indicate (i) at present during peak growing season on the Barrow Peninsula, CO2 uptake occurs at -902.3 106gC-CO2 day-1 (uncertainty using 95% CI is between -438.3 and -1366 106gC-CO2 day-1) and CH4 flux at 28.9 106gC-CH4 day-1(uncertainty using 95% CI is between 12.9 and 44.9 106gC-CH4 day-1), (ii) one century of future landscape change associated with the thaw-lake cycle only slightly alter CO2 and CH4 exchange, while (iii) moderate increases in thermokarst pits would strengthen both CO2 uptake (-166.9 106gC-CO2 day-1) and CH4 flux (2.8 106gC-CH4 day-1) with geomorphic change from low to high center polygons, cumulatively resulting in an estimated negative feedback to warming during peak growing season. © 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/61565
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Arctic Biology, University of Alaska, Fairbanks, AK, United States; U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Unit, University of Alaska, Fairbanks, AK, United States; Department of Biological Sciences, University of Texas at El Paso, El Paso, TX, United States; Department of Geography, University of Cincinnati, Cincinnati, OH, United States; Intelligence and Space Research Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Tyumen State Oil and Gas University, Tyumen, Russian Federation; Periglacial Research Unit, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; International Arctic Research Center, University of Alaska, Fairbanks, AK, United States
Recommended Citation:
Lara M.J.,Mcguire A.D.,Euskirchen E.S.,et al. Polygonal tundra geomorphological change in response to warming alters future CO2 and CH4 flux on the Barrow Peninsula[J]. Global Change Biology,2015-01-01,21(4)