Proglacial lake evolution coincident with glacier dynamics in the frontal zone of Kvíárjökull, South-East Iceland

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F24%3A00135816" target="_blank" >RIV/00216224:14310/24:00135816 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60460709:41330/24:100627 RIV/60076658:12310/24:43908554

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/esp.5781" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/esp.5781</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/esp.5781" target="_blank" >10.1002/esp.5781</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Proglacial lake evolution coincident with glacier dynamics in the frontal zone of Kvíárjökull, South-East Iceland

Popis výsledku v původním jazyce

The termini of Icelandic glaciers are highly dynamic environments. Pronounced changes in frontal ablation in recent years have consequently changed ice dynamics. In this study, we reveal the inter-seasonal dynamics of the Kvíárjökull ablation zone and proglacial zone using ArcticDEM and Sentinel-2 images acquired between 2011 and 2021 and intra-seasonal dynamics with repeated UAV surveys during summer 2021. Average glacier surface velocity in the ablation zone ranged from 51 m year−1 in 2015 up to 199 m year−1 in 2018, with maxima within the axial zone of the glacier and minima on the glacier edges. Coincidentally, and in accordance with glacier retreat/advance, the ice-marginal proglacial lake fluctuated in its area, and we interpret that it was also a key factor in the development of the glacier terminus morphology. A complex spatial pattern of glacier surface elevation changes, including thickening in the frontal true left margin of the terminus, is interpreted to be due to variable subglacial topography, relatively fast ice flow from the accumulation zone and an insulating effect of glacier surface debris cover. In contrast, the true right (southern) part of the glacier terminus experienced thinning and retreat/disintegration also during the 2021 summer season, which we attribute to enhanced frontal ablation connected to the intrusion of lake water into the crevassed glacier terminus. Overall, this study suggests that where glaciers are developing ice-marginal lakes complex patterns of glacier dynamics and mass loss can be expected, which will confound understanding of the short-term evolution of these environments.

Název v anglickém jazyce

Proglacial lake evolution coincident with glacier dynamics in the frontal zone of Kvíárjökull, South-East Iceland

Popis výsledku anglicky

The termini of Icelandic glaciers are highly dynamic environments. Pronounced changes in frontal ablation in recent years have consequently changed ice dynamics. In this study, we reveal the inter-seasonal dynamics of the Kvíárjökull ablation zone and proglacial zone using ArcticDEM and Sentinel-2 images acquired between 2011 and 2021 and intra-seasonal dynamics with repeated UAV surveys during summer 2021. Average glacier surface velocity in the ablation zone ranged from 51 m year−1 in 2015 up to 199 m year−1 in 2018, with maxima within the axial zone of the glacier and minima on the glacier edges. Coincidentally, and in accordance with glacier retreat/advance, the ice-marginal proglacial lake fluctuated in its area, and we interpret that it was also a key factor in the development of the glacier terminus morphology. A complex spatial pattern of glacier surface elevation changes, including thickening in the frontal true left margin of the terminus, is interpreted to be due to variable subglacial topography, relatively fast ice flow from the accumulation zone and an insulating effect of glacier surface debris cover. In contrast, the true right (southern) part of the glacier terminus experienced thinning and retreat/disintegration also during the 2021 summer season, which we attribute to enhanced frontal ablation connected to the intrusion of lake water into the crevassed glacier terminus. Overall, this study suggests that where glaciers are developing ice-marginal lakes complex patterns of glacier dynamics and mass loss can be expected, which will confound understanding of the short-term evolution of these environments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

<a href="/cs/project/GN22-20621O" target="_blank" >GN22-20621O: Souvislost kvartérních a současných geomorfologických procesů v geosystémech přiléhajících k polárním ledovcům a ledovcovým štítům</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Earth Surface Processes and Landforms

ISSN

0197-9337

e-ISSN

1096-9837

Svazek periodika

49

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

1487-1502

Kód UT WoS článku

001153604100001

EID výsledku v databázi Scopus

2-s2.0-85184191965