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Discussion papers
https://doi.org/10.5194/acp-2015-1061
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-2015-1061
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 01 Feb 2016

Submitted as: research article | 01 Feb 2016

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This discussion paper is a preprint. It has been under review for the journal Atmospheric Chemistry and Physics (ACP). A final paper in ACP is not foreseen.

Similarity analysis of turbulent transport and dissipation for momentum, temperature, moisture, and CO2 during BLLAST

João A. Hackerott1, Mostafa Bakhday Paskyabi2, Stephan T. Kral2, Joachim Reuder2, Amauri P. de Oliveira1, Edson P. Marques Filho3, Michel d. S. Mesquita4, and Ricardo de Camargo1 João A. Hackerott et al.
  • 1Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Sao Paulo, Brazil
  • 2Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
  • 3Institute of Physics, Federal University of Bahia, Salvador, Brazil
  • 4Uni Research Climate and Bjerknes Centre for Climate Research, Bergen, Norway

Abstract. The budget equation components for turbulent kinetic energy (TKE) and the variances of virtual potential temperature, specific humidity, and specific CO2 content have been estimated using the Inertial Dissipation and Eddy Covariance methods. A discussion with four examples is provided about the normalization used for comparing different tracer spectra, divided by the respective characteristic scale squared. A total of 124 high frequency sample segments of a 30-min period from 20 days of the Boundary Layer Afternoon and Sunset Turbulence field campaign were used in order to provide parameterizations for the dimensionless dissipation and residual (i.e. total transport) components as a function of the Atmospheric Surface Layer (ASL) stability parameter, ζ. The results show a similar linear relation for all tracers variance dissipation components, ΦDχ ≅ 0.4 + 0.2 ζ, during the convective ASL, i.e. −1 < ζ < −0.1. Although parameterizations were also proposed for the dimensionless dissipation rate of TKE and tracer variances during stable ASL, we conclude that in this regime, other mechanisms in addition to ζ may be significantly important. In the stable and near-neutral ASL stability regimes, the transport component for different tracers may not be considered the same. In these conditions, the dissipation component of TKE and tracer variances can have the same magnitude as the other terms in their respective budget equation.

João A. Hackerott et al.
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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
João A. Hackerott et al.
João A. Hackerott et al.
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Short summary
The turbulent variance equation components for wind, temperature, humidity, and CO2 were estimated applying the Inertial Dissipation and Eddy Covariance methods on BLLAST dataset. The tracers show similar behavior only for convective regime, linearly related to the buoyancy for dissipation. For stable and near-neutral, the transport term for tracers are not similar and for TKE shall not be neglected. On stable regimes, other mechanisms in addition to stability may be significantly important.
The turbulent variance equation components for wind, temperature, humidity, and CO2 were...
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