The contemporary retreat of Tasman Glacier, Southern Alps, New Zealand, and the evolution of Tasman proglacial Lake since AD 2000

Dykes, Robert C.; Brook, Martin; Winkler, Stefan

doi:10.3112/erdkunde.2010.02.03

Cited by 22 publications

(16 citation statements)

References 33 publications

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“…For the period December 2012-January 2015 (assumed to represent 2 balance years), the mass losses by sub-debris melt were converted into mean annual rates and a mass-balance gradient calculated from linear regression (Cogley and others, 2012). Even though the surface lowering shows an increase with elevation ( Fig.…”

Section: Mass-balance Gradientsmentioning

confidence: 99%

Stagnation and mass loss on a Himalayan debris-covered glacier: processes, patterns and rates

Thompson¹,

Benn

Mertes³

et al. 2016

J. Glaciol.

135

251

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ABSTRACT. The ablation areas of debris-covered glaciers typically consist of a complex mosaic of surface features with contrasting processes and rates of mass loss. This greatly complicates glacier response to climate change, and increases the uncertainty of predictive models. In this paper we present a series of high-resolution DEMs and repeat lake bathymetric surveys on Ngozumpa Glacier, Nepal, to study processes and patterns of mass loss on a Himalayan debris-covered glacier in unprecedented detail. Most mass loss occurs by melt below supraglacial debris, and melt and calving of ice cliffs (backwasting). Although ice cliffs cover only ∼5% of the area of the lower tongue, they account for 40% of the ablation. The surface debris layer is subject to frequent re-distribution by slope processes, resulting in large spatial and temporal differences in debris-layer thickness, enhancing or inhibiting local ablation rates and encouraging continuous topographic inversion. A moraine-dammed lake on the lower glacier tongue (Spillway Lake) underwent a period of rapid expansion from 2001 to 2009, but later experienced a reduction of area and volume as a result of lake level lowering and sediment redistribution. Rapid lake growth will likely resume in the near future, and may eventually become up to 7 km long.

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Section: Mass-balance Gradientsmentioning

confidence: 99%

Stagnation and mass loss on a Himalayan debris-covered glacier: processes, patterns and rates

Thompson¹,

Benn

Mertes³

et al. 2016

J. Glaciol.

135

251

View full text Add to dashboard Cite

show abstract

“…The Tasman's long length and high supraglacial debris coverage has resulted in it taking several decades to respond to climate forcing (Dykes et al . ; Chinn et al . ).…”

Section: Overview Of the Study Areasmentioning

confidence: 99%

Assessment of the evolution in velocity of two debris‐covered valley glaciers in nepal and new zealand

Haritashya

Pleasants

Copland

2015

Geografiska Annaler: Series A, Physical Geography

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Feature tracking of orthorectified pairs of Advanced Spaceborne Thermal Emission and Reflection Radiometer satellite images is used to calculate velocities for the Tasman Glacier, New Zealand (2002–2014) and the Khumbu Glacier, Nepal (2001–2008). Velocities in the middle and upper ablation zones of both glaciers show a long‐term decrease of ∼10–20%, while the terminus of Khumbu Glacier has remained near stagnation throughout the study period. In contrast, there has been a recent acceleration of the lower terminus of Tasman Glacier, from ∼5 m a–1 in 2002 to 40 m a–1 in 2014. Both of these glaciers have an extensive supraglacial debris cover across their lower ablation regions, with the Khumbu Glacier terminating on land and the Tasman Glacier terminating in a proglacial lake. The rapid recent increase in velocity of the terminus of Tasman Glacier is closely correlated with the increase in size of its proglacial lake. These results indicate the complex dynamic changes that mountain valley glaciers may undergo in response to long‐term negative mass balance.

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“…Thereafter, they experienced rapid lake expansion, catastrophic ice loss from calving (see Fig. 6) and destruction of their lower trunks (Hochstein et al, 1998;Kirkbride and Warren, 1999;Purdie and Fitzharris, 1999;Röhl, 2006;Dykes et al, 2010;Winkler et al, 2010). These ice losses were additional to those from mass balance changes associated with fluctuations in annual ELAs.…”

Section: Conceptsmentioning

confidence: 99%

Annual ice volume changes 1976–2008 for the New Zealand Southern Alps

Chinn¹,

Fitzharris

Willsman

et al. 2012

Global and Planetary Change

126

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The contemporary retreat of Tasman Glacier, Southern Alps, New Zealand, and the evolution of Tasman proglacial Lake since AD 2000

Cited by 22 publications

References 33 publications

Stagnation and mass loss on a Himalayan debris-covered glacier: processes, patterns and rates

Stagnation and mass loss on a Himalayan debris-covered glacier: processes, patterns and rates

Assessment of the evolution in velocity of two debris‐covered valley glaciers in nepal and new zealand

Annual ice volume changes 1976–2008 for the New Zealand Southern Alps

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