2 edition of Effects of seasonal changes and ground ice on electromagnetic surveys of permafrost found in the catalog.
Effects of seasonal changes and ground ice on electromagnetic surveys of permafrost
Steven A. Arcone
|Statement||Steven A. Arcone, Allan J. Delaney and Paul V. Sellmann ; prepared for Directorate of Military Programs, Office, Chief of Engineers, Cold Regions Research and Engineering Laboratory.|
|Series||CRREL report ; 79-23|
|Contributions||Delaney, Allan J., Sellmann, P. V., United States. Army. Corps of Engineers. Directorate of Military Programs., Cold Regions Research and Engineering Laboratory (U.S.)|
|The Physical Object|
|Pagination||v, 24 p. :|
|Number of Pages||24|
Studies from – on the TananaFlats in central Alaska reveal that permafrostdegradation is widespread and rapid, causing largeshifts in ecosystems from birch forests to fens andbogs. Fine-grained soils under the birch forest areice-rich and thaw settlement typically is 1– mafter the permafrost thaws. The collapsed areas arerapidly colonized by aquatic herbaceous Cited by: Permafrost degradation of coastal and marine sediments of the Arctic Seas can result in large amounts of methane emitted to the atmosphere. The quantitative assessment of such emissions requires data on variability of methane content in various types of permafrost strata. To evaluate the methane concentrations in sediments and ground ice of the Kara Sea coast, samples were collected at a Cited by: 1.
But permafrost thaw is just one symptom of a warming climate wreaking havoc in Canada’s Arctic. Thick, multi-year sea ice is disappearing, only to be replaced by thin seasonal ice; open, ice-free water is coming sooner and lasting longer; snow cover is increasing in some areas, decreasing in others; animal and plant species not seen by residents in the past are turning up, while . ERI and EMI best evaluated the thickness of shallow, thin permafrost aggradation, which was not clear from frost probing or GPR surveys. GPR most precisely estimated the depth of the active layer, which forward electrical resistivity modelling indicated to be a difficult target for electrical methods, but could be more tractable in time‐lapse Cited by:
Seven Ways Alaska Is Seeing Climate Change In Action From raging fires to migrating villages, the Frozen North offers some of the most compelling signs of Author: Sarah Zielinski. Specifically, they studied the long-term effects of projected changes in snow accrual on the methane emissions from moist acidic tundra, which covers over 25 percent of .
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Get this from a library. Effects of seasonal changes and ground ice on electromagnetic surveys of permafrost. [Steven A Arcone; Allan J Delaney; P V Sellmann; United States. Army. Corps of Engineers. Directorate of Military Programs.; Cold Regions Research and Engineering Laboratory (U.S.)].
In permafrost soils, 'excess ice', also referred to as ground ice, exists in amounts exceeding soil porosity in forms such as ice lenses and wedges. Here, we incorporate a simple representation of excess ice in the Community Land Model (CLM) to investigate how excess ice affects projected permafrost thaw and associated hydrologic responses.
Snow cover, permafrost, and seasonal ground ice are all key components of the terrestrial cryosphere, or that part of the Earth’s surface that is seasonally or perennially frozen. Recent warming in high-latitude regions has resulted in shortened snow cover duration, warming and thawing of permafrost, and earlier thaw of seasonal ground ice.
Soils in the northern permafrost region often contain abundant ground ice 33 that can exceed soil porosity, including segregated ice and ice wedges These occurrences of excess ice beyond soil pores modify soil thermal properties and add to the heterogeneity of permafrost soils S.A Arcone, P.V Sellmann, A.J DelaneyEffects of Seasonal Changes and Ground Ice on Electromagnetic Surveys of Permafrost CRREL ReportU.S.
Army Cold Regions Research and Engineering Laboratory, Hanover, N.H ()Cited by: Permafrost and seasonally frozen ground parameters are difficult to measure directly from remote sensing data since they are related to subsurface phenomena.
The response of permafrost temperatures to changes in the atmospheric conditions is non-linear and depends on various factors such as the subsurface composition, ice content or the timing and duration of the seasonal snow cover, which temporarily decouples the ground from the atmosphere (Zhang et alSchneider et alGubler et al Thermokarst formations.
The thawing of permafrost creates thermokarst topography, an uneven surface that contains mounds, sinkholes, tunnels, caverns, and steep-walled ravines caused by melting of ground ice. The hummocky ground surface resembles karst topography in limestone areas. Introduction  Effects of climate change on ecosystem functioning are likely to be most pronounced in regions where major disruptions to ecosystem structure should be expected within the range of a few degree change in mean annual temperature.
A pronounced example of such regions is the subarctic terrestrial environments that are in part underlain by by: The US Geological Survey estimates there’s a total of 1, tonnes of mercury trapped in polar ice and permafrost: roughly twice the global amount in all other soils, oceans, and atmosphere.
Arcone, Steven A., Allan J. Delaney and Paul V. Sellmann () CRREL Report Effects of seasonal changes and ground ice on electromagnetic surveys of permafrost, 24 p. Hanover, NH: Cold Regions Research and Engineering Laboratory. The rate of subsea permafrost degradation is a key factor controlling marine methane emissions in the Arctic.
Here, using re-drilled boreholes, the authors show that the ice-bonded permafrost Cited by: Most pertinent to this review are the hydrologic and physical effects of permafrost thaw and the loss of permafrost ice, described below, as these processes directly influence the shear strength of slope materials by varying pore pressure, cohesion, and internal friction, with a net effect of reducing shear strength of both bedrock, soil, and by: 2.
Raynolds, M. et al. Cumulative geoecological effects of 62 years of infrastructure and climate change in ice-rich permafrost landscapes, Prudhoe Bay Oilfield, Alaska. Glob. Change Biol. 20 Cited by: These factors modify the effects of changes in air temperatures (Zhang et al., ).
A comprehensive yet practical sampling design for monitoring permafrost within a park should include: (1) compilation of existing soils and permafrost survey information when available, or a reconnaissance-level survey and satellite image interpretation to.
depending on the relative rates of change of each. However, if the current warming trend of "Clyear continues for another 25 years or more, then structures currently founded on discontinuous permafrost, or soon to be built on icy frozen ground may experience some negative effects, if the thickness and duration of winter snow cover.
Monitoring changes in unfrozen water content with electrical resistivity surveys in cold continuous permafrost and marine sediments within the continuous permafrost zone with low to high occurrence of ground ice, including ice wedges, and massive ice Seasonal change in relative saturation and temperature-corrected resistivity Cited by: 5.
Start studying Chapter 21 Global Climate Change. Learn vocabulary, terms, and more with flashcards, games, and other study tools. How will melting permafrost in polar regions lead to a positive feedback loop that will continue to warm the climate, which will allow for more permafrost to melt.
Black carbon has no effect on glacial ice. A large amount of water was transformed into ice, promoting formation of expanded cryogenic structures as well as ice-rich horizons with numerous ice lenses in the permafrost. For the territory of the permafrost zone, groundwater is subdivided, with respect to cryogenic water-confining strata, into supra- intra- and subpermafrost water, and.
Permafrost is therefore closely associated with the periglacial environment, and usually permafrost processes take place within a periglacial environment.
Periglacial environments in Antarctica. Most of the ice-free ground in Antarctica is underlain by frozen ground. Climate change effects. Arctic permafrost has been diminishing for many centuries. The consequence is thawing soil, which may be weaker, and release of methane, which contributes to an increased rate of global warming as part of a feedback loop caused by microbial in: International Permafrost Association.The Periglacial Environment, Fourth Edition, is an authoritative overview of the worlds cold, non-glacial environments.
First published in and subsequently revised in andthe text has been the international standard for nearly 40 years.
The Fourth Edition continues to be a personal interpretation of the frost-induced conditions, geomorphic processes and landforms that.Permafrost thaw in ice-rich terrain can cause the formation of thermokarst features, or depressions associated with melting of ground ice and subsidence of the ground surface.
In many cases, thermokarst can lead to erosion of soils from terrestrial uplands .