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Closing the mass budget of a tidewater glacier: the example of Kronebreen, Svalbard
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| Zeitschriftentitel: | Journal of Glaciology |
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| Personen und Körperschaften: | , , , , , |
| In: | Journal of Glaciology, 65, 2019, 249, S. 136-148 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Cambridge University Press (CUP)
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| Schlagwörter: |
| Zusammenfassung: | <jats:title>ABSTRACT</jats:title><jats:p>In this study, we combine remote sensing, in situ and model-derived datasets from 1966 to 2014 to calculate the mass-balance components of Kronebreen, a fast-flowing tidewater glacier in Svalbard. For the well-surveyed period 2009–2014, we are able to close the glacier mass budget within the prescribed errors. During these 5 years, the glacier geodetic mass balance was −0.69 ± 0.12 m w.e. a<jats:sup>−1</jats:sup>, while the mass budget method led to a total mass balance of −0.92 ± 0.16 m w.e. a<jats:sup>−1</jats:sup>, as a consequence of a strong frontal ablation (−0.78 ± 0.11 m w.e. a<jats:sup>−1</jats:sup>), and a slightly negative climatic mass balance (−0.14 ± 0.11 m w.e. a<jats:sup>−1</jats:sup>). The trend towards more negative climatic mass balance between 1966–1990 (+0.20 ± 0.05 m w.e. a<jats:sup>−1</jats:sup>) and 2009–2014 is not reflected in the geodetic mass balance trend. Therefore, we suspect a reduction in ice-discharge in the most recent period. Yet, these multidecadal changes in ice-discharge cannot be measured from the available observations and thus are only estimated with relatively large errors as a residual of the mass continuity equation. Our study presents the multidecadal evolution of the dynamics and mass balance of a tidewater glacier and illustrates the errors introduced by inferring one unmeasured mass-balance component from the others.</jats:p> |
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| Umfang: | 136-148 |
| ISSN: |
0022-1430
1727-5652 |
| DOI: | 10.1017/jog.2018.98 |