Reconstructing Climate Change: Not All Glaciers Suitable

Yde, Jacob C.; Paasche, Øyvind

doi:10.1029/2010eo210001

Cited by 51 publications

(37 citation statements)

References 15 publications

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“…Yde and Paasche, 2010). However, the records from this study suggest that they can be used if long-term trends in glacier length and area are known, and if the stage in the surge cycle is taken into account when analyzing the measurements.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of the last five surges of Lowell Glacier, Yukon, Canada, since 1948

Bevington¹,

Copland²

2014

J. Glaciol.

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Section: Discussionmentioning

confidence: 99%

Characteristics of the last five surges of Lowell Glacier, Yukon, Canada, since 1948

Bevington¹,

Copland²

2014

J. Glaciol.

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“…Benn and others, 2007) or surging (cf. Lingle and Fatland, 2003;Yde and Paasche, 2010;Nuth and others, 2013) processes). The present observational dataset thus confirms the findings from earlier scientific studies (e.g.…”

Section: Global Centennial Glacier Retreat and Mass Lossmentioning

confidence: 99%

Historically unprecedented global glacier decline in the early 21st century

et al. 2015

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Observations show that glaciers around the world are in retreat and losing mass. Internationally coordinated for over a century, glacier monitoring activities provide an unprecedented dataset of glacier observations from ground, air and space. Glacier studies generally select specific parts of these datasets to obtain optimal assessments of the mass-balance data relating to the impact that glaciers exercise on global sea-level fluctuations or on regional runoff. In this study we provide an overview and analysis of the main observational datasets compiled by the World Glacier Monitoring Service (WGMS). The dataset on glacier front variations (∼42 000 since 1600) delivers clear evidence that centennial glacier retreat is a global phenomenon. Intermittent readvance periods at regional and decadal scale are normally restricted to a subsample of glaciers and have not come close to achieving the maximum positions of the Little Ice Age (or Holocene). Glaciological and geodetic observations (∼5200 since 1850) show that the rates of early 21st-century mass loss are without precedent on a global scale, at least for the time period observed and probably also for recorded history, as indicated also in reconstructions from written and illustrated documents. This strong imbalance implies that glaciers in many regions will very likely suffer further ice loss, even if climate remains stable.

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“…However, extraction of climate signals from glaciers is not straightforward, because the history, current state and future evolution of glaciers result from the interplay of external factors (e.g. changes in surface air temperature or precipitation) and also intrinsic glacier dynamics (Hagen and others, 2005;Yde and Paasche, 2010). Surge-type glaciers illustrate this affinity in a drastic way.…”

Section: Introductionmentioning

confidence: 99%

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

Dunse¹,

Greve

Schuler³

et al. 2011

J. Glaciol.

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ABSTRACT. A large part of the ice flux within ice caps occurs through spatially limited fast-flowing units. Some of them permanently maintain fast flow, whereas others operate in an oscillatory mode, characterized by short-lived active phases followed by long quiescent phases. This surge-type behaviour results from intrinsic rather than external factors, thus complicating estimates of glacier response to climate change. Here we present numerical model results from Austfonna, an ice cap on Svalbard that comprises several surge-type basins. Previous studies have suggested a thermally controlled soft-bed surge mechanism for Svalbard. We systematically change the parameters that govern the nature of basal motion and thereby control the transition between permanent and oscillatory fast flow. Surge-type behaviour is realized by a relatively abrupt onset of basal sliding when basal temperatures approach the pressure-melting point and enhanced sliding of marine grounded ice. Irrespective of the dynamic regime, the absence of considerable volumes of temperate ice, both in the observed and simulated ice cap, indicates that fast flow is accomplished by basal motion over a temperate bed. Given an idealized present-day climate, the equilibrium ice-cap size varies significantly, depending on the chosen parameters.

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Reconstructing Climate Change: Not All Glaciers Suitable

Cited by 51 publications

References 15 publications

Characteristics of the last five surges of Lowell Glacier, Yukon, Canada, since 1948

Characteristics of the last five surges of Lowell Glacier, Yukon, Canada, since 1948

Historically unprecedented global glacier decline in the early 21st century

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

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