The 1982/83 surge and antecedent quiescent phase of Variegated Glacier: revising the original dataset for application in flow line models

Geffen, Sharon van; Oerlemans, J.

doi:10.1017/jog.2017.43

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…Many of the above‐described processes have already been included in individual studies (Buri et al., 2016; Miles et al., 2016), but not yet in large‐scale IDGES. In addition, other mechanisms, such as the link between glacier sliding and basal hydrology (e.g., De Fleurian et al., 2018), and a time‐evolving representation of glacier surges (vs. steady state approaches and simplified models used so far, e.g., Oerlemans and Van Pelt (2015) and van Geffen and Oerlemans (2017)) could be explored further through high‐resolution higher‐order/full‐Stokes IDGES.…”

Section: Challenges and Outlookmentioning

confidence: 99%

Ice‐Dynamical Glacier Evolution Modeling—A Review

Zekollari

Huss

Farinotti

et al. 2022

Reviews of Geophysics

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Glaciers play a crucial role in the Earth System: they are important water suppliers to lower‐lying areas during hot and dry periods, and they are major contributors to the observed present‐day sea‐level rise. Glaciers can also act as a source of natural hazards and have a major touristic value. Given their societal importance, there is large scientific interest in better understanding and accurately simulating the temporal evolution of glaciers, both in the past and in the future. Here, we give an overview of the state of the art of simulating the evolution of individual glaciers over decadal to centennial time scales with ice‐dynamical models. We hereby highlight recent advances in the field and emphasize how these go hand‐in‐hand with an increasing availability of on‐site and remotely sensed observations. We also focus on the gap between simplified studies that use parameterizations, typically used for regional and global projections, and detailed assessments for individual glaciers, and explain how recent advances now allow including ice dynamics when modeling glaciers at larger spatial scales. Finally, we provide concrete recommendations concerning the steps and factors to be considered when modeling the evolution of glaciers. We suggest paying particular attention to the model initialization, analyzing how related uncertainties in model input influence the modeled glacier evolution and strongly recommend evaluating the simulated glacier evolution against independent data.

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Section: Challenges and Outlookmentioning

confidence: 99%

Ice‐Dynamical Glacier Evolution Modeling—A Review

Zekollari

Huss

Farinotti

et al. 2022

Reviews of Geophysics

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“…In the TJP, the observed winter speed-up and summer slowdown during the active surging phase can be readily interpreted in terms of causal mechanism, as these processes resemble hydrological rather than thermal regulation, although the long active phase distinguishes these events from hydrologically controlled surges in Alaska [64]. In addition, the thickening of the glacier accumulation area may lead to the occurrence of basal sliding (Table 5).…”

Section: Surge Trigger Mechanismsmentioning

confidence: 99%

The Evolution of the Glacier Surges in the Tuanjie Peak, the Qilian Mountains

Gao

Liu

et al. 2022

Remote Sensing

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Glacier surges (GSs) are a manifestation of glacier instability and one of the most striking phenomena in the mountain cryosphere. Here, we utilize optical images acquired between 1973 and 2021 to map changes in glacier surface velocity and morphology and characterize differences in surface elevation using multi-source DEMs in the Tuanjie Peak (TJP), located in the Qilian Mountains (QLMs). These data provide valuable insights into the recent dynamic evolution of glaciers and hint at how they might evolve in the next few years. We identified a confirmed surge-type glacier (STG), three likely STGs, and three possible STGs. Our observations show that TJP GSs are generally long-term, although they are shorter in some cases. During the active phase, all glaciers exhibit thickened reservoir areas and thinned receiving areas, or vice-versa. The ice volume transfer was between 0.11 ± 0.13 × 107 m3 to 5.71 ± 0.69 × 107 m3. Although it was impossible to obtain integrated velocity profiles throughout the glacier surge process due to the limitations of available satellite imagery, our recent observations show that winter velocities were much higher than summer velocities, suggesting an obvious correlation between surge dynamics and glacial hydrology. However, the initiation and termination phase of GSs in this region was slow, which is similar to Svalbard-type STGs. We hypothesize that both thermal and hydrological controls are crucial. Moreover, we suggest that the regional warming trend may potentially increase glacier instability and the possibility of surge occurrence in this region.

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“…AK, correspond to accumulation rates on the order of 1.4 m a -1 (Eisen et al, 2001;Van Geffen and Oerlemans, 2017). However, there can be large variations in surge periodicity between glaciers in the same region.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Climate on Surging at Donjek Glacier, Yukon, Canada

Kochtitzky

Winski

McConnel

et al. 2019

Preprint

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Abstract. Links between climate and glacier surges are not well understood, but are required to enable prediction of glacier surges and mitigation of associated hazards. Here, we investigate the role of snow accumulation and temperature on surge periodicity, glacier area changes, and timing of surge initiation since the 1930s for Donjek Glacier, Yukon, Canada. Snow accumulation measured in three ice cores collected at Eclipse Icefield, at the head of the glacier, indicate that a cumulative accumulation of 13.1–17.7 m w.e. of snow occurred in the 10–12 years between each of its last eight surges. This suggests that a cumulative accumulation threshold must be passed before the initiation of a surge event, although it remains unclear whether the relationship between cumulative snowfall and surging is due to the consistency in repeat surge interval and decadal average precipitation, or if it is indeed a prerequisite to surging. We also examined the 1968 to 2017 climate record from Burwash Landing, 30 km from the glacier, to determine whether a relationship exists between surge periodicity and an increase of 2.5 °C in mean annual air temperature over this period. No such relationship was found, although each of the past 8 surge events has been less extensive than the previous, with the terminus area approximately 7.96 km2 smaller after the 2012–2014 surge event compared to the ~ 1947 surge event. This study shows that the impacts of climate and surging is not yet understood and suggests that internal glacier processes may play a more important role in controlling glacier surge events.

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The 1982/83 surge and antecedent quiescent phase of Variegated Glacier: revising the original dataset for application in flow line models

Cited by 5 publications

References 32 publications

Ice‐Dynamical Glacier Evolution Modeling—A Review

Ice‐Dynamical Glacier Evolution Modeling—A Review

The Evolution of the Glacier Surges in the Tuanjie Peak, the Qilian Mountains

The Impact of Climate on Surging at Donjek Glacier, Yukon, Canada

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