期刊
JOURNAL OF GLACIOLOGY
卷 64, 期 244, 页码 236-246出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jog.2018.12
关键词
energy balance; glacier ablation phenomena; glacier mass balance; melt-surface; mountain glaciers
资金
- Observatoire des Sciences de l'Univers de Grenoble (OSUG)
- Institut des Sciences de l'Univers (INSU)
- Labex OSUG [ANR10LABx56]
- ANR JCJC MONISNOW
- ANR MONISNOW projects [1-JS56-005-01]
Band ogives are a striking and enigmatic feature of Mer de Glace glacier flow. The surface mass balances (SMBs) of these ogives have been thoroughly investigated over a period of 12 years. We find similar cumulative SMBs over this period, ranging between -64.1 and -66.2 m w.e., on the dark and light ogives even though the dark ogive albedo is similar to 40% lower than that of the light ogives. We, therefore, looked for another process that could compensate for the large difference of absorbed short-wave radiation between dark and light ogives. Based on in situ roughness measurements, our numerical modeling experiments demonstrate that a significant difference in turbulent flux over the dark and light ogives due to different surface roughnesses could compensate for the difference in radiative forcing. Our results discard theories for the genesis of band ogives that are based on the assumption of a strong ice ablation contrast between dark and light ogives. More generally, our study demonstrates that future roughness changes are as important to analyze as the radiative impacts of a potential increase of aerosols or debris at the surface of glaciers.
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