Sensitivity of mountain glacier mass balance to changes in bare-ice albedo

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In: Annals of Glaciology, 58(2017), 75pt2, S. 119 - 129
Format: E-Artikel
Sprache: Unbestimmt
veröffentlicht: Cambridge University Press (CUP)
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ISSN: 0260-3055
1727-5644
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finc.format ElectronicArticle
finc.mega_collection Cambridge University Press (CUP) (CrossRef)
finc.id ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAxNy9hb2cuMjAxNy4yNQ
finc.source_id 49
ris.type EJOUR
rft.atitle Sensitivity of mountain glacier mass balance to changes in bare-ice albedo
rft.epage 129
rft.genre article
rft.issn 0260-3055
1727-5644
rft.issue 75pt2
rft.jtitle Annals of Glaciology
rft.tpages 11
rft.pages 119-129
rft.pub Cambridge University Press (CUP)
rft.date 2017-07-01
x.date 2017-07-01T00:00:00Z
rft.spage 119
rft.volume 58
abstract <jats:title>ABSTRACT</jats:title> <jats:p>Albedo is an important parameter in the energy balance of bare-ice surfaces and modulates glacier melt rates. The prolongation of the ablation period enforces the albedo feedback and highlights the need for profound knowledge on impacts of bare-ice albedo on glacier mass balance. In this study, we assess the mass balance sensitivity of 12 Swiss glaciers with abundant long-term in-situ data on changes in bare-ice albedo. We use pixel-based bare-ice albedo derived from Landsat 8. A distributed mass-balance model is applied to the period 1997–2016 and experiments are performed to assess the impact of albedo changes on glacier mass balance. Our results indicate that glacier-wide mass-balance sensitivities to changes in bare-ice albedo correlate strongly with mean annual mass balances (<jats:italic>r</jats:italic> <jats:sup>2</jats:sup> = 0.81). Large alpine glaciers react more sensitively to bare-ice albedo changes due to their ablation areas being situated at lower elevations. We find average sensitivities of glacier-wide mass balance of −0.14 m w.e. a<jats:sup>−1</jats:sup> per 0.1 albedo decrease. Although this value is considerably smaller than sensitivity to air temperature change, we stress the importance of the enhanced albedo feedback that will be amplified due to atmospheric warming and a suspected darkening of glacier surface in the near future.</jats:p>
authors Naegeli Kathrin
Huss Matthias
doi 10.1017/aog.2017.25
languages und
url http://dx.doi.org/10.1017/aog.2017.25
version 0.9
x.subjects Earth-Surface Processes
x.type journal-article
x.oa 1