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  Nighttime wind and scalar variability within and above an Amazonian canopy

Oliveira, P. E. S., Acevedo, O. C., Sörgel, M., Tsokankunku, A., Wolff, S., Araújo, A. C., et al. (2018). Nighttime wind and scalar variability within and above an Amazonian canopy. Atmospheric Chemistry and Physics, 18(5), 3083-3099. doi:10.5194/acp-18-3083-2018.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0000-3C24-5 Versions-Permalink: https://hdl.handle.net/21.11116/0000-000C-CD9A-0
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 Urheber:
Oliveira, Pablo E. S.1, Autor
Acevedo, Otávio C., Autor
Sörgel, Matthias, Autor
Tsokankunku, Anywhere, Autor
Wolff, Stefan, Autor
Araújo, Alessandro C., Autor
Souza, Rodrigo A. F., Autor
Sá, Marta O., Autor
Manzi, Antônio O., Autor
Andreae, Meinrat O., Autor
Affiliations:
1External Organizations, ou_persistent22              

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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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 Datum: 2017-07-072017-07-102018-03
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: BEX581
DOI: 10.5194/acp-18-3083-2018
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Titel: Atmospheric Chemistry and Physics
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geosciences Union
Seiten: - Band / Heft: 18 (5) Artikelnummer: - Start- / Endseite: 3083 - 3099 Identifikator: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016