| DOI: | 10.1016/j.earscirev.2019.02.018
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| 论文题名: | Effects of changing permafrost conditions on hydrological processes and fluvial fluxes |
| 作者: | Lafrenière M.J.; Lamoureux S.F.
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| 刊名: | Earth Science Reviews
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| ISSN: | 00128252
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| 出版年: | 2019
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| 卷: | 191 | | 起始页码: | 212
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| 结束页码: | 223
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| 语种: | 英语
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| 中文关键词: | Active layer detachments
; Climate change
; Dissolved organic matter
; Hydrochemical fluxes
; Particulate fluxes
; Permafrost hydrology
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| 英文关键词: | active layer
; climate change
; dissolved organic matter
; fluvial deposit
; hydrology
; permafrost
; sediment transport
; suspended sediment
; thermokarst
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| 英文摘要: | This paper reviews the impacts of permafrost change on hydrological and related hydrochemical, particulate and organic fluxes in small Arctic catchments. While the emphasis is directed at High Arctic systems, literature and recent developments from other Arctic regions are also included. Hydrological change, particularly a shift from nival (snowmelt) dominance to increasing pluvial (rainfall) runoff contributions has important consequences for the timing and magnitude of hydrological fluxes. A key distinction is made between thermal perturbation, where changing melt season thaw conditions result in deep thaw with minimal geomorphic or surface hydrological effects, in contrast to physical perturbation, where permafrost change results in some form of thermokarst or physical disturbance such as mass movement or enhanced erosion. The latter disturbances are commonly expressed as localized thermo erosional gullies, active layer detachments and retrogressive thaw slumps. Results from recent research emphasise the importance of hydrological connectivity in terms of the downstream effect of a particular permafrost perturbation. Well-connected systems, either at the surface as channelized flows, or in the subsurface, through new or altered active layer flow pathways, result in substantial changes in downstream fluvial fluxes. Surface hydrological connectivity of localized permafrost disturbances increases transport of suspended sediment and particulate organic matter, the latter of which is often old and comparatively labile. Exposed ice in retrogressive thaw slumps sustains discharge during the melt season, further increasing fluxes. Thermal perturbation holds a substantially greater potential downstream impact due to widespread mobilization of solutes and dissolved organic carbon and nitrogen, and several studies point to rapid microbial alteration of carbon and inorganic nitrogen transformation in the shallow subsurface. Collectively, these results point to altered runoff, sediment transport and hydrochemical fluxes with spatial and hydrological controls. © 2019 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/165846
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| Appears in Collections: | 气候变化与战略
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作者单位: | Department of Geography and Planning, Queen's University, Kingston, ON K7L 3N6, Canada
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| Recommended Citation: | |
Lafrenière M.J.,Lamoureux S.F.. Effects of changing permafrost conditions on hydrological processes and fluvial fluxes[J]. Earth Science Reviews,2019-01-01,191
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