DOI: 10.1002/2014GL062804
论文题名: Microtopographic and depth controls on active layer chemistry in Arctic polygonal ground
作者: Newman B.D. ; Throckmorton H.M. ; Graham D.E. ; Gu B. ; Hubbard S.S. ; Liang L. ; Wu Y. ; Heikoop J.M. ; Herndon E.M. ; Phelps T.J. ; Wilson C.J. ; Wullschleger S.D.
刊名: Geophysical Research Letters
ISSN: 0094-8864
EISSN: 1944-8595
出版年: 2015
卷: 42, 期: 6 起始页码: 1808
结束页码: 1817
语种: 英语
英文关键词: active layer
; Arctic
; geochemistry
; permafrost
; polygonal ground
Scopus关键词: Biogeochemistry
; Ecology
; Ecosystems
; Geochemistry
; Geometry
; Permafrost
; Active Layer
; Arctic
; Depth variation
; Geochemical classification
; Measurements of
; Permafrost thaws
; polygonal ground
; Water chemistry
; Chemical analysis
; biogeochemistry
; carbon cycle
; classification
; ecosystem function
; lowland environment
; microtopography
; permafrost
; polygon
; porewater
; Alaska
; Arctic Ocean
; Barrow
; United States
英文摘要: Polygonal ground is a signature characteristic of Arctic lowlands, and carbon release from permafrost thaw can alter feedbacks to Arctic ecosystems and climate. This study describes the first comprehensive spatial examination of active layer biogeochemistry that extends across high- and low-centered, ice wedge polygons, their features, and with depth. Water chemistry measurements of 54 analytes were made on surface and active layer pore waters collected near Barrow, Alaska, USA. Significant differences were observed between high- and low-centered polygons suggesting that polygon types may be useful for landscape-scale geochemical classification. However, differences were found for polygon features (centers and troughs) for analytes that were not significant for polygon type, suggesting that finer-scale features affect biogeochemistry differently from polygon types. Depth variations were also significant, demonstrating important multidimensional aspects of polygonal ground biogeochemistry. These results have major implications for understanding how polygonal ground ecosystems function, and how they may respond to future change. Key Points Chemistry was measured in Arctic polygonal ground Differences were found for polygon types, features, and depth Topographic and depth controls on polygonal ground chemistry are significant ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927726207&doi=10.1002%2f2014GL062804&partnerID=40&md5=9489b443b9fc9f1ccdd8895173895a5c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8480
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Newman B.D.,Throckmorton H.M.,Graham D.E.,et al. Microtopographic and depth controls on active layer chemistry in Arctic polygonal ground[J]. Geophysical Research Letters,2015-01-01,42(6).