New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure

Eric Ivan Petersen, Joseph S. Levy, John W. Holt, Cassie M. Stuurman

Research output: Contribution to journalArticle

Abstract

The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers.

Original languageEnglish (US)
JournalJournal of Glaciology
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

rock glacier
galena
radar
ice
glacier
debris avalanche
cirque
creek
snow accumulation
snowpack
ground penetrating radar
summer

Keywords

  • Accumulation
  • debris-covered glaciers
  • glacier geophysics
  • supraglacial debris

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure. / Petersen, Eric Ivan; Levy, Joseph S.; Holt, John W.; Stuurman, Cassie M.

In: Journal of Glaciology, 01.01.2019.

Research output: Contribution to journalArticle

@article{4df97f77ec9b47299deba88f4a72830a,
title = "New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure",
abstract = "The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers.",
keywords = "Accumulation, debris-covered glaciers, glacier geophysics, supraglacial debris",
author = "Petersen, {Eric Ivan} and Levy, {Joseph S.} and Holt, {John W.} and Stuurman, {Cassie M.}",
year = "2019",
month = "1",
day = "1",
doi = "10.1017/jog.2019.67",
language = "English (US)",
journal = "Journal of Glaciology",
issn = "0022-1430",
publisher = "International Glaciology Society",

}

TY - JOUR

T1 - New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure

AU - Petersen, Eric Ivan

AU - Levy, Joseph S.

AU - Holt, John W.

AU - Stuurman, Cassie M.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers.

AB - The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers.

KW - Accumulation

KW - debris-covered glaciers

KW - glacier geophysics

KW - supraglacial debris

UR - http://www.scopus.com/inward/record.url?scp=85073111856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073111856&partnerID=8YFLogxK

U2 - 10.1017/jog.2019.67

DO - 10.1017/jog.2019.67

M3 - Article

AN - SCOPUS:85073111856

JO - Journal of Glaciology

JF - Journal of Glaciology

SN - 0022-1430

ER -