monitoring glacier albedo as a proxy to derive summer and annual surface mass balances from optical remote-sensing data
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2018
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Abstract
Less than 0.25 % of the 250 000 glaciers inventoried in the Randolph
Glacier Inventory (RGI V.5) are currently monitored with in situ measurements
of surface mass balance. Increasing this archive is very challenging,
especially using time-consuming methods based on in situ measurements, and
complementary methods are required to quantify the surface mass balance of
unmonitored glaciers. The current study relies on the so-called albedo
method, based on the analysis of albedo maps retrieved from optical satellite
imagery acquired since 2000 by the MODIS sensor, on board the TERRA
satellite. Recent studies revealed substantial relationships between summer
minimum glacier-wide surface albedo and annual surface mass balance, because
this minimum surface albedo is directly related to the accumulation–area
ratio and the equilibrium-line altitude.
On the basis of 30 glaciers located in the French Alps where annual surface mass balance data are available, our study conducted on the period 2000–2015 confirms the robustness and reliability of the relationship between the summer minimum surface albedo and the annual surface mass balance. For the ablation season, the integrated summer surface albedo is significantly correlated with the summer surface mass balance of the six glaciers seasonally monitored. These results are promising to monitor both annual and summer glacier-wide surface mass balances of individual glaciers at a regional scale using optical satellite images. A sensitivity study on the computed cloud masks revealed a high confidence in the retrieved albedo maps, restricting the number of omission errors. Albedo retrieval artifacts have been detected for topographically incised glaciers, highlighting limitations in the shadow correction algorithm, although inter-annual comparisons are not affected by systematic errors.
On the basis of 30 glaciers located in the French Alps where annual surface mass balance data are available, our study conducted on the period 2000–2015 confirms the robustness and reliability of the relationship between the summer minimum surface albedo and the annual surface mass balance. For the ablation season, the integrated summer surface albedo is significantly correlated with the summer surface mass balance of the six glaciers seasonally monitored. These results are promising to monitor both annual and summer glacier-wide surface mass balances of individual glaciers at a regional scale using optical satellite images. A sensitivity study on the computed cloud masks revealed a high confidence in the retrieved albedo maps, restricting the number of omission errors. Albedo retrieval artifacts have been detected for topographically incised glaciers, highlighting limitations in the shadow correction algorithm, although inter-annual comparisons are not affected by systematic errors.
| Reference Key |
davaze2018themonitoring
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|---|---|
| Authors | ;L. Davaze;A. Rabatel;Y. Arnaud;P. Sirguey;D. Six;A. Letreguilly;M. Dumont |
| Journal | journal of applied polymer science |
| Year | 2018 |
| DOI |
10.5194/tc-12-271-2018
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| URL | |
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