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- W4243433393 abstract "In this paper, we present the summer-time energy balance for a site in the lower ablation zone of the West Greenland ice sheet. The summer climate of this part of Greenland is sunny and dry. The energy that is available for melting (on average 174 W m −2 or 4.5 cm w.e.d −1 ) is mainly provided by net global radiation two-thirds and sensible-heat flux (one-third). The contribution of the sub-surface heat flux, the latent-heat flux and the net longwave radiation to the energy balance are small. We tested some parameterizations to calculate energy-balance components that are currently used in general circulation models, energy-balance models and mesoscale meteorological models. For the area and time period under consideration, parameterizations that use screen-level temperature for the calculation of incoming longwave radiation systematically underestimate this quantity by 10 W m −2 owing to the proximity of the melting-ice surface that restricts temperature increase of the lowest air layers. The incoming global radiation was predicted correctly. Simple explicit schemes that calculate the stability corrections for turbulent fluxes as a function of the bulk Richardson number tend to underestimate the turbulent fluxes by 15 W m −2 . The aerodynamic roughness length z 0 derived from wind-speed profiles appears to be erroneously small, leading to underestimation of the fluxes by 30 W m −2 . Probably, the wind profile is distorted by the rough terrain. An estimate of z 0 biased on microtopographical survey yielded a more realistic result. Because all errors work in the same direction, the use of some of the parameterizations can cause serious underestimation of the melting energy." @default.
- W4243433393 created "2022-05-12" @default.
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- W4243433393 date "1996-01-01" @default.
- W4243433393 modified "2023-09-30" @default.
- W4243433393 title "Characteristics of the lower ablation zone of the West Greenland ice sheet for energy-balance modelling" @default.
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- W4243433393 doi "https://doi.org/10.3189/s0260305500013392" @default.
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