Role of boundary layer processes in understanding the CO2-budget
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hdl:2117/11168
Tipus de documentText en actes de congrés
Data publicació2010
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Abstract
Boundary layer dynamics, including surface pro-
cesses determine the daily evolution of temperature
and moisture in the atmospheric boundary layer (ABL,
Lemone et al., 2002). Moreover, turbulent mixing drives
the exchange of CO2 between the atmosphere and bio-
sphere and, finally, the advection influences the distribu-
tion of carbon dioxide near the surface (Yi et al., 2000;
Werner et al., 2006; Eugster and Siegrist, 2000), and as
a consequence Net Ecosystem-atmosphere Exchange
(NEE) of carbon dioxide.
NEE is continuously estimated around the world usu-
ally from measurements at one height near the ground of
the time evolution of the CO2 concentration and turbu-
lent flux (Valentini et al., 2000; Baldocchi et al., 2001). In
these observations, among other approximations, advec-
tion is supposed negligible (Yi et al., 2000), and a well-
mixed boundary layer is considered during the whole day.
In this study the diurnal variability of the CO2 con-
centration is studied by means of tower measurements,
mixed-layer theory and Large-Eddy simulations done with
the Dutch model DALES (Heuss et al., 2010). The work
presented here is an extension of Casso-Torralba et al.
(2008), where observations were presented. Particular
attention is devoted to analyze the role of boundary layer
processes on the CO2 evolution and to study the uncer-
tainties in the calculation the Net ecosystem-atmosphere
Exchange for CO2.
CitacióPino, D.; Vilà-Guerau de Arellano, J.; Peters, W. Role of boundary layer processes in understanding the CO2-budget. A: American Geophysical Union. Fall Meeting. "2010 AGU Fall Meeting". San Francisco: 2010.
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