A New Bed Topography Map for Columbia Glacier

Robert McNabb, Regine Hock, Shad O’Neel, Lowell A Rasmussen

Research output: Contribution to conferenceAbstract

Abstract

Tidewater glaciers are an important, yet poorly understood component of future sea level rise. The processes controlling calving, and therefore tidewater glacier retreat, are a complicated interplay between surface and bed topography of the glacier and fjord, ice dynamics, sedimentary conditions, and water temperature/heat flux. Columbia Glacier, Alaska, is a large tidewater glacier that began a rapid retreat ca. 1980, which continues today. It is one of the best-studied glaciers in the world, with an extensive dataset that predates the retreat and continues through the present day. Little is known, however, about the bed topography of Columbia Glacier upstream of the 2004 terminus. Knowledge of the bed topography informs knowledge of ice volume and thickness distribution, the latter of which is a critical iceflow parameter. In addition, knowledge of the total ice volume constrains future sea level rise projections. The existing topography map is limited to 15% of the current and formerly glacierized area, and is not without substantial errors. Using a method based on continuity of mass and constrained by surface velocity fields, surface DEMs, bathymetry, and surface mass balance rates, a new full-coverage bed topography map of Columbia Glacier is presented, along with an estimate of the current ice volume.

Conference

ConferenceAmerican Geophysical Union Fall Meeting
CountryUnited States
CitySan Francisco
Period5/12/119/12/11

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tidewater glacier
glacier
topography
ice
glacier retreat
fjord
bathymetry
digital elevation model
heat flux
mass balance
water temperature
sea level rise

Cite this

McNabb, R., Hock, R., O’Neel, S., & Rasmussen, L. A. (2011). A New Bed Topography Map for Columbia Glacier. Abstract from American Geophysical Union Fall Meeting, San Francisco, United States.
McNabb, Robert ; Hock, Regine ; O’Neel, Shad ; Rasmussen, Lowell A. / A New Bed Topography Map for Columbia Glacier. Abstract from American Geophysical Union Fall Meeting, San Francisco, United States.
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title = "A New Bed Topography Map for Columbia Glacier",
abstract = "Tidewater glaciers are an important, yet poorly understood component of future sea level rise. The processes controlling calving, and therefore tidewater glacier retreat, are a complicated interplay between surface and bed topography of the glacier and fjord, ice dynamics, sedimentary conditions, and water temperature/heat flux. Columbia Glacier, Alaska, is a large tidewater glacier that began a rapid retreat ca. 1980, which continues today. It is one of the best-studied glaciers in the world, with an extensive dataset that predates the retreat and continues through the present day. Little is known, however, about the bed topography of Columbia Glacier upstream of the 2004 terminus. Knowledge of the bed topography informs knowledge of ice volume and thickness distribution, the latter of which is a critical iceflow parameter. In addition, knowledge of the total ice volume constrains future sea level rise projections. The existing topography map is limited to 15{\%} of the current and formerly glacierized area, and is not without substantial errors. Using a method based on continuity of mass and constrained by surface velocity fields, surface DEMs, bathymetry, and surface mass balance rates, a new full-coverage bed topography map of Columbia Glacier is presented, along with an estimate of the current ice volume.",
author = "Robert McNabb and Regine Hock and Shad O’Neel and Rasmussen, {Lowell A}",
year = "2011",
language = "English",
note = "American Geophysical Union Fall Meeting ; Conference date: 05-12-2011 Through 09-12-2011",

}

McNabb, R, Hock, R, O’Neel, S & Rasmussen, LA 2011, 'A New Bed Topography Map for Columbia Glacier' American Geophysical Union Fall Meeting, San Francisco, United States, 5/12/11 - 9/12/11, .

A New Bed Topography Map for Columbia Glacier. / McNabb, Robert; Hock, Regine; O’Neel, Shad; Rasmussen, Lowell A.

2011. Abstract from American Geophysical Union Fall Meeting, San Francisco, United States.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - A New Bed Topography Map for Columbia Glacier

AU - McNabb, Robert

AU - Hock, Regine

AU - O’Neel, Shad

AU - Rasmussen, Lowell A

PY - 2011

Y1 - 2011

N2 - Tidewater glaciers are an important, yet poorly understood component of future sea level rise. The processes controlling calving, and therefore tidewater glacier retreat, are a complicated interplay between surface and bed topography of the glacier and fjord, ice dynamics, sedimentary conditions, and water temperature/heat flux. Columbia Glacier, Alaska, is a large tidewater glacier that began a rapid retreat ca. 1980, which continues today. It is one of the best-studied glaciers in the world, with an extensive dataset that predates the retreat and continues through the present day. Little is known, however, about the bed topography of Columbia Glacier upstream of the 2004 terminus. Knowledge of the bed topography informs knowledge of ice volume and thickness distribution, the latter of which is a critical iceflow parameter. In addition, knowledge of the total ice volume constrains future sea level rise projections. The existing topography map is limited to 15% of the current and formerly glacierized area, and is not without substantial errors. Using a method based on continuity of mass and constrained by surface velocity fields, surface DEMs, bathymetry, and surface mass balance rates, a new full-coverage bed topography map of Columbia Glacier is presented, along with an estimate of the current ice volume.

AB - Tidewater glaciers are an important, yet poorly understood component of future sea level rise. The processes controlling calving, and therefore tidewater glacier retreat, are a complicated interplay between surface and bed topography of the glacier and fjord, ice dynamics, sedimentary conditions, and water temperature/heat flux. Columbia Glacier, Alaska, is a large tidewater glacier that began a rapid retreat ca. 1980, which continues today. It is one of the best-studied glaciers in the world, with an extensive dataset that predates the retreat and continues through the present day. Little is known, however, about the bed topography of Columbia Glacier upstream of the 2004 terminus. Knowledge of the bed topography informs knowledge of ice volume and thickness distribution, the latter of which is a critical iceflow parameter. In addition, knowledge of the total ice volume constrains future sea level rise projections. The existing topography map is limited to 15% of the current and formerly glacierized area, and is not without substantial errors. Using a method based on continuity of mass and constrained by surface velocity fields, surface DEMs, bathymetry, and surface mass balance rates, a new full-coverage bed topography map of Columbia Glacier is presented, along with an estimate of the current ice volume.

UR - https://www.researchgate.net/publication/258460672_A_New_Bed_Topography_Map_for_Columbia_Glacier

M3 - Abstract

ER -

McNabb R, Hock R, O’Neel S, Rasmussen LA. A New Bed Topography Map for Columbia Glacier. 2011. Abstract from American Geophysical Union Fall Meeting, San Francisco, United States.