NDLI: Momentum- and Heat-Flux Parametrization at Dome C, Antarctica: A Sensitivity Study

Content Provider	Springer Nature Link
Author	Vign, Etienne Genthon, Christophe Barral, Hélène Amory, Charles Picard, Ghislain Gallée, Hubert Casasanta, Giampietro Argentini, Stefania
Copyright Year	2016
Abstract	An extensive meteorological observational dataset at Dome C, East Antarctic Plateau, enabled estimation of the sensitivity of surface momentum and sensible heat fluxes to aerodynamic roughness length and atmospheric stability in this region. Our study reveals that (1) because of the preferential orientation of snow micro-reliefs (sastrugi), the aerodynamic roughness length $$z_{0}$$ varies by more than two orders of magnitude depending on the wind direction; consequently, estimating the turbulent fluxes with a realistic but constant $$z_{0}$$ of 1 mm leads to a mean friction velocity bias of $$24\,\%$$ in near-neutral conditions; (2) the dependence of the ratio of the roughness length for heat $$z_{0t}$$ to $$z_{0}$$ on the roughness Reynolds number is shown to be in reasonable agreement with previous models; (3) the wide range of atmospheric stability at Dome C makes the flux very sensitive to the choice of the stability functions; stability function models presumed to be suitable for stable conditions were evaluated and shown to generally underestimate the dimensionless vertical temperature gradient; as these models differ increasingly with increases in the stability parameter z / L, heat flux and friction velocity relative differences reached $$100\,\%$$ when $$z/L > 1$$ ; (4) the shallowness of the stable boundary layer is responsible for significant sensitivity to the height of the observed temperature and wind data used to estimate the fluxes. Consistent flux results were obtained with atmospheric measurements at heights up to 2 m. Our sensitivity study revealed the need to include a dynamical parametrization of roughness length over Antarctica in climate models and to develop new parametrizations of the surface fluxes in very stable conditions, accounting, for instance, for the divergence in both radiative and turbulent fluxes in the first few metres of the boundary layer.
Starting Page	341
Ending Page	367
Page Count	27
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	162
Issue Number	2
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-08-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antarctic Plateau Model parametrizations Roughness length Stable boundary layer Turbulent fluxes Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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