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  Turbulent and non-turbulent exchange of scalars between the forest and the atmosphere at night in Amazonia

Oliveira, P. E. S., Acevedo, O. C., Sörgel, M., Tsokankunku, A., Wolff, S., Araújo, A. C., et al. (2017). Turbulent and non-turbulent exchange of scalars between the forest and the atmosphere at night in Amazonia. Atmospheric Chemistry and Physics Discussions, 17.

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Oliveira, Pablo E. S., Autor
Acevedo, Otávio C., Autor
Sörgel, Matthias1, Autor           
Tsokankunku, Anywhere1, Autor           
Wolff, Stefan1, Autor           
Araújo, Alessandro C., Autor
Sá, Marta O., Autor
Manzi, Antonio O., Autor
Andreae, M. O.1, Autor           
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

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 Zusammenfassung: Nocturnal turbulent kinetic energy (TKE) and fluxes of energy, CO2 and O3 between the Amazon forest and the atmosphere are evaluated for a 20-day campaign at the Amazon Tall Tower Observatory (ATTO) site. The distinction of these quantities between fully turbulent (weakly stable) and intermittent (very stable) nights is discussed. Spectral analysis indicates that low-frequency, non-turbulent fluctuations are responsible for a large portion of the variability observed on intermittent nights. In these conditions, the low-frequency exchange may dominate over the turbulent transfer. In particular, we show that within the canopy most of the exchange of CO2 and H2O happens on temporal scales longer than 100 s. At 80 m, on the other hand, the turbulent fluxes are almost absent in such very stable conditions, suggesting a boundary layer shallower than 80 m. The relationship between TKE and mean winds shows that the stable boundary layer switches from the very stable to the weakly stable regime during intermittent bursts of turbulence. In general, fluxes estimated with long temporal windows that account for the low-frequency effects are more dependent on the stability over a deeper layer above the forest than they are on the stability between the top of the canopy and its interior, suggesting that low-frequency processes are controlled over a deeper layer above the forest.

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Sprache(n): eng - English
 Datum: 2017
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.5194/acp-2017-638
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Titel: Atmospheric Chemistry and Physics Discussions
  Kurztitel : Atmos. Chem. Phys. Discuss.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geophysical Society, Copernicus Publ.
Seiten: 25 Band / Heft: 17 Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 1680-7367
CoNE: https://pure.mpg.de/cone/journals/resource/111076360006006