How to handle glacier area change in geodetic mass balance

Innovations in geodesy enable widespread analysis of glacier surface elevation change and geodetic mass balance. However, coincident glacier area data are less widely available, causing inconsistent handling of glacier area change. Here we quantify the bias introduced into meters water equivalent (m...

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Published in:Journal of glaciology 2023-12, Vol.69 (278), p.2169-2175
Main Authors: Florentine, Caitlyn, Sass, Louis, McNeil, Christopher, Baker, Emily, O'Neel, Shad
Format: Article
Language:English
Subjects:
Balance studies
Bias
Geodesy
Geology
glacier mapping
glacier mass balance
Glaciers
Letter
Mass balance
Mass balance of glaciers
mountain glaciers
Mountains
Remote sensing
Time series
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container_issue 278
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container_title Journal of glaciology
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creator Florentine, Caitlyn
Sass, Louis
McNeil, Christopher
Baker, Emily
O'Neel, Shad
description Innovations in geodesy enable widespread analysis of glacier surface elevation change and geodetic mass balance. However, coincident glacier area data are less widely available, causing inconsistent handling of glacier area change. Here we quantify the bias introduced into meters water equivalent (m w.e.) specific geodetic mass balance results when using a fixed, maximum glacier area, and illustrate the bias for five North American glaciers. Sites span latitudes from the northern U.S. Rocky Mountains (48°N) to the Central Alaska Range (63°N) between 1948 and 2021. Results show that fixed (maximum) area treatment subdues the m w.e. mass change signal, underestimating mass balance by up to 19% in our test cases. This bias scales with relative glacier area change and the mass balance magnitude. Thus, the bias for specific geodetic mass balances will be most pronounced across rapidly deglaciating regions. Our analysis underscores the need for temporally resolved glacier area in geodetic mass balance studies.
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source Cambridge Journals Online; Publicly Available Content Database
subjects Balance studies
Bias
Geodesy
Geology
glacier mapping
glacier mass balance
Glaciers
Letter
Mass balance
Mass balance of glaciers
mountain glaciers
Mountains
Remote sensing
Time series
title How to handle glacier area change in geodetic mass balance
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