Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 402567
Title Role of boundary layer processes on the mixed layer CO2-budget
Author(s) Pino, D.; Vilà-Guerau de Arellano, J.
Source In: 19th Symposium on Boundary Layers and Turbulence and the 29th Conference on Agricultural and Forest Meteorology; Keystone, Colorado, USA. - Boston : AMS - p. J9.1 - J9.1.
Event Boston : AMS 19th Symposium on Boundary Layers and Turbulence, Keystone, 2010-08-01/2010-08-06
Department(s) Meteorology and Air Quality
WIMEK
Publication type Contribution in proceedings
Publication year 2010
Abstract The diurnal and vertical variability of temperature, humidity and specially CO2 in the atmospheric boundary layer is studied by combining detailed observations taken at Cabauw (The Netherlands), Large-Eddy simulations (LES) and mixed layer theory. The research focus on the role played by the entrainment and other boundary layer driven processes on the distribution and diurnal evolution of CO2 in the boundary layer. The relative importance of this entrained air to ventilate CO2 will be analyzed. During the morning the exchange of CO2 between the residual free tropospheric air masses with the growing boundary layer is a more important contribution than the CO2 uptake by the vegetation, whereas during the afternoon the assimilation by grass at the ground could become the dominant process. This work is completed by quantifying the terms of the budget conservation equation of CO2 using observations and the LES numerical experiments. It will be shown that under non-advective conditions, the flux divergence measurements can correctly reproduce the diurnal variability of temperature, moisture and CO2. The role of boundary layer dynamics on the CO2-budget has direct implications in inferring the CO2-uptake flux from CO2 observations. Our findings show how dynamic factors, as the morning temperature inversion or the lapse rate, are relevant in the retrieval of the CO2 flux. By analyzing the sensitivity of the inferred CO2 flux to the dynamics of the boundary layer and to the CO2 variables, we are able to estimate the uncertainties of the inferred CO2 flux to mean CO2 concentrations
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