Please use this identifier to cite or link to this item:
Title: Nocturnal accumulation of CO2 underneath a tropical forest canopy along a topographical gradient
Authors: Araüjo, Alessandro Carioca de
Kruut, Bart
Nobre, Antônio Donato
Dolman, A. Johannes
Waterloo, M. J.
Moors, Eddy J.
Souza, Juliana S. de
Keywords: Carbon Balance
Carbon Dioxide
Diurnal Variation
Flux Measurement
Forest Canopy
Nocturnal Activity
Seasonal Variation
Topographic Effect
Tropical Forest
Vertical Profile
Water Vapor
South America
Carbon Dioxide
Circadian Rhythm
Environmental Monitoring
Tropic Climate
Air Movements
Carbon Dioxide
Circadian Rhythm
Environmental Monitoring
Tropical Climate
Issue Date: 2008
metadata.dc.publisher.journal: Ecological Applications
metadata.dc.relation.ispartof: Volume 18, Número 6, Pags. 1406-1419
Abstract: Flux measurements of carbon dioxide and water vapor above tropical rain forests are often difficult to interpret because the terrain is usually complex. This complexity induces heterogeneity in the surface but also affects lateral movement of carbon dioxide (CO2) not readily detected by the eddy covariance systems. This study describes such variability using measurements of CO2 along vertical profiles and along a toposequence in a tropical rain forest near Manaus, Brazil. Seasonal and diurnal variation was recorded, with atmospheric CO2 concentration maxima around dawn, generally higher CO2 build-up in the dry season and stronger daytime CO 2 drawdown in the wet season. This variation was reflected all along the toposequence, but the slope and valley bottom accumulated clearly more CO2 than the plateaus, depending on atmospheric stability. Particularly during stable nights, accumulation was along lines of equal altitude, suggesting that large amounts of CO2 are stored in the valleys of the landscape. Flushing of this store only occurs during mid-morning, when stored CO2 may well be partly transported back to the plateaus. It is clear that, for proper interpretation of tower fluxes in such complex and actively respiring terrain, the horizontal variability of storage needs to be taken into account not only during the night but also during the mornings. © 2008 by the Ecological Society of America.
metadata.dc.identifier.doi: 10.1890/06-0982.1
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.