An estimate of global glacier volume

posted Jan 7, 2013, 3:50 AM by Aslak Grinsted   [ updated Nov 10, 2014, 1:09 AM ]
Abstract
I asses the feasibility of multi-variate scaling relationships to estimate glacier volume from glacier inventory data. Scaling laws are calibrated against volume observations optimized for the specific purpose of estimating total global glacier ice volume. I find that adjustments for continentality and elevation range improve skill of area-volume scaling. These scaling relationships are applied to each record in the Randolph Glacier Inventory which is the first globally complete inventory of glaciers and ice caps. I estimate that the total volume of all glaciers in the world is 0.35±0.07 m sea level equivalent, including ice sheet peripheral glaciers. This is substantially less than a recent state-of-the-art estimate. Area volume scaling bias issues for large ice masses, and incomplete inventory data are offered as explanations for the difference.


Citation: Grinsted, A. (2013): An estimate of global glacier volume, The Cryosphere, 7, 141–151, doi:10.5194/tc-7-141-2013
[link]




More details on the study can be found under this link where I discuss:

  • Comparisons to Radic and Hock 2010, and Huss & Farinotti 2012. 
  • Area-volume scaling and glacier slope.
  • Physical vs. statistical estimates of glacier volume.
  • Area-Volume scaling, -controversial? 


Thoughts on my experience with the open discussion format

This is my first open discussion paper, and I think it was an excellent choice for this manuscript. It is also my first solo paper and the comments from the referees were therefore especially welcome. (Thank you anon.referee#1, R. Braithwaite, and M.Huss for comments that spurred great improvement over the discussion paper).

Figure caption: The volume fraction stored in all the glaciers larger than a given area. Dark cyan shows the results of this study, and thin bright cyan excluding regions with many glacier complexes in RGI v2. The distribution from Huss and Farinotti (2012) is shown in green.



This figure shows that ~85% of the global glacier volume is stored in ~1000 largest RGI glacier complexes (>100 km2). In the paper I suggest that we can improve the glacier estimate through detailed studies of those complexes.