Data/hora: 23/09/2024 12:13:12

Biblioteca(s): 	Embrapa Amazônia Oriental.	
Data corrente: 	22/11/2011	
Data da última atualização: 	27/01/2023	
Autoria: 	QUERINO, C. A. S.; SMEETS, C. J. P. P.; VIGANO, I.; HOLZINGER, R.; MOURA, V.; GATTI, L. V.; MARTINEWSKI, A.; MANZI, A. O.; ARAUJO, A. C. de; RÖCKMANN, T.	
Afiliação: 	C. A. S. Querino, Utrecht University; C. J. P. P. Smeets, Utrecht University; I. Vigano, Utrecht University; R. Holzinger, Utrecht University; V. MOURA, INPA; L. V. Gatti, IPEN; A. Martinewski, IPEN; A. O. Manzi, INPA; ALESSANDRO CARIOCA DE ARAUJO, INPA / CPATU; T. Röckmann, Utrecht University.	
Título: 	Methane flux, vertical gradient and mixing ratio measurements in a tropical forest.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Atmospheric Chemistry and Physics Discussions, v. 11, p. 5313-5350, Feb. 2011.	
DOI: 	10.5194/acpd-11-5313-2011	
Idioma: 	Inglês	
Conteúdo: 	Measurements of CH4 mixing ratio, vertical gradients and turbulent fluxes were carried out in a tropical forest (Reserva Biol ´ogica Cuieiras), about 60 km north of Manaus, Brazil. The methane mixing ratio and flux measurements were performed at a height of 53m (canopy height 35m). In addition, vertical CH4 gradients were measured within the canopy using custom made air samplers at levels of 2, 16 and 36m above ground. The methane gradients within the canopy reveal that there is a continuous methane source at the surface. No clear evidence for aerobic methane emission from the canopy was found. The methane fluxes above the canopy are small but consistently show an the canopy using custom made air samplers at levels of 2, 16 and 36m above ground. The methane gradients within the canopy reveal that there is a continuous methane source at the surface. No clear evidence for aerobic methane emission from the canopy was found. The methane fluxes above the canopy are small but consistently show an upward flux with a maximum early in the morning, and the measured fluxes are in agreement with what is expected from the positive CH4 gradient in the canopy. In the morning hours, a strong canopy venting peak is observed for both CH4 and CO2, but for CO2 this peak is then superimposed by photosynthetic uptake, whereas the peak lasts longer for CH4. Monthly averaged diurnal cycles of the CH4 mixing ratio show a decrease during daytime and increase during nighttime. The magnitude of the difference in CH4 mixing ratio between day and night gradually increases throughout the wet season. The fluxes required to explain the nighttime increase are in agreement with the nighttime fluxes measured above the canopy, which implies that the CH4 increase in the nighttime boundary layer originates from local sources	
Thesagro: 	Floresta Tropical.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/183178/1/acpd-11-5313-2011.pdf	
Registro original: 	Embrapa Amazônia Oriental (CPATU)	
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