scholarly journals Diurnal and vertical variability of the sensible heat and carbon dioxide budgets in the atmospheric surface layer

2008 ◽  
Vol 113 (D12) ◽  
Author(s):  
Pau Casso-Torralba ◽  
Jordi Vilà-Guerau de Arellano ◽  
Fred Bosveld ◽  
Maria Rosa Soler ◽  
Alex Vermeulen ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Surface Layer ◽  
Atmospheric Surface Layer ◽  
Sensible Heat ◽  
Vertical Variability

Daily cycle of the surface layer and energy balance on the high Antarctic Plateau

2005 ◽  
Vol 17 (1) ◽  
pp. 121-133 ◽  
Author(s):  
DIRK VAN AS ◽  
MICHIEL VAN DEN BROEKE ◽  
RODERIK VAN DE WAL
Keyword(s):  
Heat Flux ◽  
Surface Layer ◽  
Energy Balance ◽  
Wind Speed ◽  
Atmospheric Surface Layer ◽  
Specific Humidity ◽  
Inertial Oscillation ◽  
Sensible Heat ◽  
Daily Cycle ◽  
Near Surface

This paper focuses on the daily cycle of the surface energy balance and the atmospheric surface layer during a detailed meteorological experiment performed near Kohnen base in Dronning Maud Land, East Antarctica, in January and February 2002. Temperature, specific humidity, wind speed and the turbulent scales of these quantities, exhibit a strong daily cycle. The sensible heat flux cycle has a mean amplitude of ∼8 W m−2, while the latent heat flux has an amplitude of less than 2 W m−2, which is small compared to the amplitude of net radiation (∼ 35 W m−2) and sub-surface heat (∼ 25 W m−2). Between ∼ 9 and 16 h GMT convection occurs due to a slightly unstable atmospheric surface layer. At the end of the afternoon, the wind speed decreases abruptly and the mixed layer is no longer supported by the sensible heat input; the stratification becomes stable. At night a large near-surface wind shear is measured due to the presence of a nocturnal jet, which is likely to be katabatically driven, but can also be the result of an inertial oscillation. No strong daily cycle in wind direction is recorded, since both the katabatic forcing at night and the daytime forcing by the large-scale pressure gradient were directed approximately downslope during the period of measurement.

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