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EddyUH software

Ivan Mammarella, Olli Peltola, Annika Nordbo

EddyUH is an advanced software for processing raw eddy covariance data, developed and maintained by our group. A substantial amount of instruments (sonic anemometers and gas analyzers) are supported, and standardized procedures are fully implemented in EddyUH. In order to advance methodical issues concerning especially CH4, N2O, OCS, O3 and VOCs fluxes, most updated corrections and methods for EC flux estimates for these gases have been also included. EddyUH is flexible and easy to use thanks to a simple graphical user interface (GUI) and different data plotting tools. It is freely available for research purposes. For more information, please visit our Eddy Covariance webpage and check the EddyUH paper published in AMT (Mammarella et al., 2016).

 

 

Figure 1: EC data processing scheme for open- and closed-path gas analyser data. Relative magnitude of each processing step is also reported. From: Mammarella et al., 2016.

Spectral corrections of eddy-covariance measurements

Ivan Mammarella, Olli Peltola, Annika Nordbo

The eddy-covariance flux-measurement technique is the only means to measure vertical turbulent fluxes directly, but its ability to detect small turbulence is limited. So called high frequency spectral corrections are performed to take into account flux that is caused by small turbulence and that cannot be detected by the EC setup. The largest reason for such flux-loss is sorption processes that H2O undergo in a sampling tube (Figure 1). Mammarella et al. (2009) linked water vapour flux-loss to tube age and relative humidity and Nordbo et al. (2013) further studied sorption phenomena and derived a new transfer function based on a sorption model analogous to matrix diffusion. Nordbo and Katul (2013) developed a new automated spectral correction method based on Wavelet analysis.

Partners

Jussi Timonen and Pekka Kekäläinen from the University of Jyväskylä

 


Figure 2: Drop formation on a (a) clean and (b) aged and dirty eddy-covariance sampling tube. From: Nordbo et al., 2013.

Recent/relevant publications

Mammarella, I., S. Launiainen, T. Gronholm, P. Keronen, J. Pumpanen, U. Rannik, and T. Vesala, 2009: Relative humidity effect on the high-frequency attenuation of water vapor flux measured by a closed-path eddy covariance system. J. of Atm. and Ocean. Techn., 26 (9), 1856–1866.

Nordbo A. and G. Katul (2013). A wavelet-based correction method for eddy-covariance high-frequency losses in scalar concentration measurements. Bound.-Lay. Meteorol. 146(1), 81-102, doi: 10.1007/s10546-012-9759-9

Nordbo A., P. Kekäläinen, E. Siivola, R. Aula, J. Timonen and T. Vesala. (2013). Tube transport of water vapor with condensation and desorption. Appl. Phys. Lett., 102, 194101, doi: 10.1063/1.4804639

Mammarella, I., Peltola, O., Nordbo, A., Järvi, L., and Rannik, Ü. (2016). Quantifying the uncertainty of eddy covariance fluxes due to the use of different software packages and combinations of processing steps in two contrasting ecosystems, Atmos. Meas. Tech., 9, 4915-4933, doi:10.5194/amt-9-4915-2016

 

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