Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012

M. Niwano, Teruo Aoki, S. Matoba, S. Yamaguchi, T. Tanikawa, K. Kuchiki, H. Motoyama

Research output: Contribution to journalArticle

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Abstract

The surface energy balance (SEB) from 30 June to 14 July 2012 at site SIGMA (Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic)-A, (78°03′ N, 67°38′ W; 1490 m a.s.l.) on the northwest Greenland Ice Sheet (GrIS) was investigated by using in situ atmospheric and snow measurements as well as numerical modeling with a one-dimensional multi-layered physical snowpack model called SMAP (Snow Metamorphism and Albedo Process). At SIGMA-A, remarkable near-surface snowmelt and continuous heavy rainfall (accumulated precipitation between 10 and 14 July was estimated to be 100 mm) were observed after 10 July 2012. Application of the SMAP model to the GrIS snowpack was evaluated based on the snow temperature profile, snow surface temperature, surface snow grain size, and shortwave albedo, all of which the model simulated reasonably well. Above all, the fact that the SMAP model successfully reproduced frequently observed rapid increases in snow albedo under cloudy conditions highlights the advantage of the physically based snow albedo model (PBSAM) incorporated in the SMAP model. Using such data and model, we estimated the SEB at SIGMA-A from 30 June to 14 July 2012. Radiation-related fluxes were obtained from in situ measurements, whereas other fluxes were calculated with the SMAP model. By examining the components of the SEB, we determined that low-level clouds accompanied by a significant temperature increase played an important role in the melt event observed at SIGMA-A. These conditions induced a remarkable surface heating via cloud radiative forcing in the polar region.

Original languageEnglish
Pages (from-to)971-988
Number of pages18
JournalCryosphere
Volume9
Issue number3
DOIs
Publication statusPublished - May 11 2015
Externally publishedYes

Fingerprint

snowmelt
snow
albedo
summer
simulation
metamorphism
surface energy
energy balance
snowpack
ice sheet
cloud radiative forcing
polar region
temperature profile
in situ measurement
surface temperature
grain size
warming
melt
heating
rainfall

ASJC Scopus subject areas

  • Water Science and Technology
  • Earth-Surface Processes

Cite this

Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012. / Niwano, M.; Aoki, Teruo; Matoba, S.; Yamaguchi, S.; Tanikawa, T.; Kuchiki, K.; Motoyama, H.

In: Cryosphere, Vol. 9, No. 3, 11.05.2015, p. 971-988.

Research output: Contribution to journalArticle

Niwano, M, Aoki, T, Matoba, S, Yamaguchi, S, Tanikawa, T, Kuchiki, K & Motoyama, H 2015, 'Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012', Cryosphere, vol. 9, no. 3, pp. 971-988. https://doi.org/10.5194/tc-9-971-2015
Niwano, M. ; Aoki, Teruo ; Matoba, S. ; Yamaguchi, S. ; Tanikawa, T. ; Kuchiki, K. ; Motoyama, H. / Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012. In: Cryosphere. 2015 ; Vol. 9, No. 3. pp. 971-988.
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