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CD-03 Abstract

Periodic, Transient, and Spatially Inhomogeneous Influences on Carbon Exchange in Amazonia

David Roy Fitzjarrald — State University of New York, Albany (US-PI)
Osvaldo Luiz Leal de Moraes — UFSM - Universidade Federal de Santa Maria (SA-PI)

We propose observations and analyses to

infer transports of CO2, water vapor, and energy from the natural and the

disturbed regions of Amazonia.  We ask support to continue ongoing direct

surface climate and flux measurements at several sites in LBA-ECO.  Fluxes

will also be estimated using the boundary layer budget approach.  A major

focus will be to determine how carbon fluxes are influenced by natural and

human-induced landscape inhomogeneities.  Scales of inhomogeneities

addressed range from the river-land contrast, the pasture-forest contrast, and

the gap-closed canopy contrast inside the forest.  Special attention will

go to understanding how changes in agricultural practices in the Amazon alter

carbon exchanges in cleared areas.  One new initiative aims to improve

understanding of the respiration rate in forests by studying subcanopy flows. 

A second new initiative to quantify canopy structure to relate this structure to

the forest flux tower observations is proposed.  This proposal addresses

LBA-ECO Science Questions CD–Q1 CD–Q3b, and LC–Q1.



Our objectives are:



1) To observe

local wind circulations (river and land breezes, drainage flows) and assess

their influence on boundary layer development.  To infer surface heat,

water vapor, and CO2 fluxes from  temporal changes in their canopy and

boundary layer concentrations .



2) To relate

light availability to the ecosystem to cloudiness, and to determine the

resulting effect on  net ecosystem carbon exchange (NEE).



3) To quantify how land use change from pasture to

cultivation alters the carbon budget in one cleared area, and develop

parameterizations of exchange processes  for modeling.





4) To quantify the vertical and horizontal structure of

the forest canopy near flux towers in the Tapajos National Forest.



5) To relate canopy structure n to turbulent

canopy-atmosphere exchange in regions of closed-canopy primary forest, near

natural gaps, and in the cut-over mosaic of a selectively logged site.



6)  To reduce uncertainties in long-term tower flux

observations of the respiration rate )through better understanding the effect of

subcanopy drainage flows at two LBA-ECO Study Areas.

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