An inventory and estimate of water stored in firn fields, glaciers, debris-covered glaciers, and rock glaciers in the Aconcagua River Basin, Chile

Janke, Jason R.; Ng, Sam; Bellisario, Antonio

doi:10.1016/j.geomorph.2017.09.002

Cited by 50 publications

(36 citation statements)

References 41 publications

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“…Many researchers have assessed the hydrological importance of rock glaciers in terms of water stored as ground ice (Azócar & Brenning, ; Brenning, ; Croce & Milana, ; Janke, Ng, & Bellisario, ; Jones, Harrison, Anderson, & Betts, ; Jones, Harrison, Anderson, Selley, et al, ; Rangecroft, Harrison, & Anderson, ). However, Arenson and Jakob () criticized this reasoning of Azócar and Brenning (), which is followed in other studies cited above, noting that the debris cover on rock glaciers insulates ground ice, preventing substantial melt rates (Burger, Degenhardt, & Giardino, ; Krainer & Mostler, ).…”

Section: Introductionmentioning

confidence: 99%

Groundwater flow and storage processes in an inactive rock glacier

Harrington

Mozil

Bentley

2018

Hydrological Processes

103

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Groundwater flow through coarse blocky landforms contributes to streamflow in mountain watersheds, yet its role in the alpine hydrologic cycle has received relatively little attention. This study examines the internal structure and hydrogeological characteristics of an inactive rock glacier in the Canadian Rockies using geophysical imaging techniques, analysis of the discharge hydrograph of the spring draining the rock glacier, and chemical and stable isotopic compositions of source waters. The results

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Section: Introductionmentioning

confidence: 99%

Groundwater flow and storage processes in an inactive rock glacier

Harrington

Mozil

Bentley

2018

Hydrological Processes

103

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“…This phase has included compilations of rock glacier inventories (e.g. Bolch and Marchenko, 2009;Cremonese et al, 2011;Bolch and Gorbunov, 2014;Falaschi et al, 2014;Colucci et al, 2016;Janke et al, 2017;Wang et al, 2017b;Jones et al, 2018a), mapping of their spatial distributions and their relations with environmental controls such as topography and climate (e.g. Chueca, 1992;Brazier et al, 1998;Brenning, 2005;Janke, 2007;Johnson et al, 2007;Kenner and Magnusson, 2017;Onaca et al, 2017;Jones et al, 2018b), estimations of the distribution of permafrost based on rock glaciers (e.g.…”

Section: Introductionmentioning

confidence: 99%

Rock glaciers in Daxue Shan, south-eastern Tibetan Plateau: an inventory, their distribution, and their environmental controls

Ran

Liu

2018

The Cryosphere

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Abstract. Rock glaciers are typical periglacial landforms. They can indicate the existence of permafrost, and can also shed light on the regional geomorphological and climatic conditions under which they may have developed. This article provides the first rock glacier inventory of Daxue Shan, south-eastern Tibetan Plateau. The inventory is based on analyses of Google Earth imagery. In total, 295 rock glaciers were identified in Daxue Shan, covering a total area of 55.70 km 2 between the altitudes of 4300 and 4600 m above sea level. Supported by ArcGIS and SPSS software programmes, we extracted and calculated morphometric parameters of these rock glaciers, and analysed the characteristics of their spatial distribution within Daxue Shan. Our inventory suggests that the lower altitudinal boundary for permafrost across the eight aspects of observed slopes differs significantly and that the lower altitudinal permafrost boundary is ∼ 104 m higher on western than eastern-facing slopes. Moraine-type and talus-derived rock glaciers exhibit mean gradients that are all concentrated within the 22-35 • range. However, lobate rock glaciers (27-45 • ) have a higher mean gradient than tongue-shaped rock glaciers (22-35 • ). Shady (i.e. N, NE, and E) slopes appear related to the presence of moraine-type rock glaciers, whereas sunny (i.e. W, SW, and S) slopes appear related to the presence of talus-derived rock glaciers. Rock glaciers in Daxue Shan are more concentrated within tertiary monzonitic granite, which is more sensitive than other lithological components to the freeze-thaw process. Continuous weathering of this substrate provides the ideal raw material for the rock glacier development. These results show that environmental controls (i.e. topographical, climatic, lithological factors) greatly affect the formation and development of rock glaciers. This study provides important data for exploring the relation between maritime periglacial environments and the development of rock glaciers on the south-eastern Tibetan Plateau (TP). It may also highlight the characteristics typical of rock glaciers found in a maritime setting.

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“…This thermal regime allows a relevant presence of snowpack and glaciers (e.g. Juncal Norte; Janke et al, 2017;Ohlanders et al, 2013).…”

Section: Climate Settingsmentioning

confidence: 99%

Comparison of approaches to interpolating climate observations in steep terrain with low-density gauging networks

Ossa-Moreno

Keir

McIntyre

et al. 2019

Hydrol. Earth Syst. Sci.

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The accuracy of hydrological assessments in mountain regions is often hindered by the low density of gauges coupled with complex spatial variations in climate. Increasingly, spatial datasets (i.e. satellite and other products) and new computational tools are merged with ground observations to address this problem. This paper presents a comparison of approaches of different complexities to spatially interpolate monthly precipitation and daily temperature time series in the upper Aconcagua catchment in central Chile. A generalised linear mixed model (GLMM) whose parameters are estimated through approximate Bayesian inference is compared with simpler alternatives: inverse distance weighting (IDW), lapse rates (LRs), and two methods that analyse the residuals between observations and World-Clim (WC) data or Climate Hazards Group Infrared Precipitation with Station data (CHIRPS). The assessment is based on a leave-one-out cross validation (LOOCV), with the rootmean-squared error (RMSE) being the primary performance criterion for both climate variables, while the probability of detection (POD) and false-alarm ratio (FAR) are also used for precipitation. Results show that for spatial interpolation of temperature and precipitation, the approaches based on the WorldClim or CHIRPS residuals may be recommended as being more accurate, easy to apply and relatively robust to tested reductions in the number of estimation gauges. The GLMM has comparable performance when all gauges were included and is better for estimating occurrence of precipitation but is more sensitive to the reduction in the number of gauges used for estimation, which is a constraint in sparsely monitored catchments.

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An inventory and estimate of water stored in firn fields, glaciers, debris-covered glaciers, and rock glaciers in the Aconcagua River Basin, Chile

Cited by 50 publications

References 41 publications

Groundwater flow and storage processes in an inactive rock glacier

Groundwater flow and storage processes in an inactive rock glacier

Rock glaciers in Daxue Shan, south-eastern Tibetan Plateau: an inventory, their distribution, and their environmental controls

Comparison of approaches to interpolating climate observations in steep terrain with low-density gauging networks

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