A first approximation of the volume of ground ice, Richards Island, Pleistocene Mackenzie delta, Northwest Territories, Canada

1980 ◽  
Vol 17 (4) ◽  
pp. 509-516 ◽  
Author(s):  
W. H. Pollard ◽  
H. M. French
Keyword(s):  
Data Bank ◽  
Topographic Maps ◽  
Mackenzie Delta ◽  
Ground Ice ◽  
Geotechnical Data ◽  
Ice Volume ◽  
First Approximation ◽  
Arctic Alaska ◽  
Morphometric Analyses ◽  
Using Data

Using data contained in the Mackenzie Valley Geotechnical Data Bank together with data derived from morphometric analyses of topographic maps and air photographs, the volume of ground ice present in the upper 10 m of Richards Island is calculated to be 10.27 km3. Pore and segregated ice constitute over 80% of the total ice volume. Wedge ice constitutes between 12 and 16% of total ice volume in the upper 4.5 m, and approximately 36% of all excess ice. In the upper 1–2 m, wedge ice may exceed 50% of earth materials. Pingo ice is insignificant in terms of its contribution to total ice volumes. Excess ice constitutes 14% of the upper 10 m of permafrost; it follows that thawing of this layer of permafrost may lead to an average subsidence of 1.4 m.The results of this study are probably typical of other areas of the Pleistocene Mackenzie delta. There is also general agreement with data obtained from arctic Alaska.

scholarly journals Changes in the elevation and extent of two glaciers along the Yanglonghe river, Qilian Shan, China

2010 ◽  
Vol 56 (196) ◽  
pp. 309-317 ◽  
Author(s):  
Donghui Shangguan ◽  
Shiyin Liu ◽  
Yongjian Ding ◽  
Yingsong Zhang ◽  
Jing Li ◽  
...  
Keyword(s):  
Historical Data ◽  
Topographic Maps ◽  
Gps Data ◽  
Glacier Area ◽  
Weather Station ◽  
Volume Depletion ◽  
Ice Volume ◽  
Digital Elevation ◽  
Elevation Changes ◽  
Using Data

AbstractWe use topographic maps, historical data, multispectral satellite data and real-time kinematic GPS data to analyze glacier area, length and ice-elevation changes of two glaciers in the central Qilian Shan, China, between 1956 and 2007. We find that the fronts of Yanglonghe glacier No. 1 (5Y432A1) and Yanglonghe glacier No. 5 (5Y432A5) have retreated by 266.5 ± 37.1 m (5.2 ± 0.73 m a−1) and 181.4 ± 37.1 m (3.6 ± 0.73 m a−1) respectively, and that this retreat accelerated after 1999. During the study period, the glacier areas decreased by ∼4.1% and 15.9% respectively. In addition, spatially non-uniform thinning, which averaged 20.2 ± 11 m (0.4 ± 0.22 m a−1) and 16.9 ± 11 m (0.33 ± 0.22 m a−1) in the ablation areas of 5Y432A1 and 5Y432A5 respectively, is observed using digital elevation models constructed using data from 1956, 1977 and 2007. The ice-volume depletion from 5Y432A1 (2.91 × 107 m3) was 2.7 times greater than from the smaller 5Y432A5 (1.08 × 107 m3). Based on records from nearby Tuole weather station, increasing annual temperatures are principally responsible for the observed glacier thinning and retreat.

scholarly journals An estimate of ice wedge volume for a High Arctic polar desert environment, Fosheim Peninsula, Ellesmere Island

2018 ◽  
Vol 12 (11) ◽  
pp. 3589-3604 ◽  
Author(s):  
Claire Bernard-Grand'Maison ◽  
Wayne Pollard
Keyword(s):  
Satellite Imagery ◽  
Regional Scale ◽  
High Arctic ◽  
Ellesmere Island ◽  
The Arctic ◽  
Ground Ice ◽  
Polar Desert ◽  
Ice Volume ◽  
Carbon Release ◽  
Wedge Volume

Abstract. Quantifying ground-ice volume on a regional scale is necessary to assess the vulnerability of permafrost landscapes to thaw-induced disturbance like terrain subsidence and to quantify potential carbon release. Ice wedges (IWs) are a ubiquitous ground-ice landform in the Arctic. Their high spatial variability makes generalizing their potential role in landscape change problematic. IWs form polygonal networks that are visible on satellite imagery from surface troughs. This study provides a first approximation of IW ice volume for the Fosheim Peninsula, Ellesmere Island, a continuous permafrost area characterized by polar desert conditions and extensive ground ice. We perform basic GIS analyses on high-resolution satellite imagery to delineate IW troughs and estimate the associated IW ice volume using a 3-D subsurface model. We demonstrate the potential of two semi-automated IW trough delineation methods, one newly developed and one marginally used in previous studies, to increase the time efficiency of this process compared to manual delineation. Our methods yield acceptable IW ice volume estimates, validating the value of GIS to estimate IW volume on much larger scales. We estimate that IWs are potentially present on 50 % of the Fosheim Peninsula (∼3000 km2), where 3.81 % of the top 5.9 m of permafrost could be IW ice.

A Model for Quantifying Ground-Ice Volume, Yukon Coast, Western Arctic Canada

2017 ◽  
Vol 28 (3) ◽  
pp. 534-542 ◽  
Author(s):  
Nicole J. Couture ◽  
Wayne H. Pollard
Keyword(s):  
Arctic Canada ◽  
Ground Ice ◽  
Ice Volume ◽  
Western Arctic

Using data clustering in evaluation the diversity of poverty danger in Polish subregions

2016 ◽  
Vol 61 (5) ◽  
pp. 17-36
Author(s):  
Beata Kraszewska
Keyword(s):  
World Bank ◽  
Social Care ◽  
Data Bank ◽  
Poverty Rate ◽  
Local Data ◽  
Diagnostic Features ◽  
Small Areas ◽  
The World Bank ◽  
Spatial Diversification ◽  
Using Data

The article discusses the use of cluster analysis methods to assess the differentiation of risk of poverty in the Polish subregion. On the basis of data on the labor market, wages and social care, developed on the basis of the resources of the Local Data Bank of the CSO and their variable-correlation verification, the author has defined a set of diagnostic features used to determine the cluster of sub-regions similar in terms of risk of poverty. Results were compared with the results of study work in the field of spatial diversification of estimating at-risk-of-poverty rate (ARPR) in 2011 conducted by the Small Areas Statistics Centre of the Statistical Office in Poznań in cooperation with experts from the World Bank.

Sign in / Sign up

Export Citation Format

Share Document