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dc.contributor.authorGerken, Tobias
dc.contributor.authorRuddell, Benjamin L.
dc.contributor.authorFuentes, Jose D.
dc.contributor.authorAraújo, Alessandro
dc.contributor.authorBrunsell, Nathaniel A.
dc.contributor.authorMaia, Jair
dc.contributor.authorManzi, Antonio O.
dc.contributor.authorMercer, Juliane R.
dc.contributor.authordos Santos, Rosa Nascinmento
dc.contributor.authorvon Randow, Celso
dc.contributor.authorStoy, Paul C.
dc.identifier.citationGerken, Tobias, Benjamin L. Ruddell, Jose D. Fuentes, Alessandro Araujo, Nathaniel A. Brunsell, Jair Maia, Antonio Manzi, Juliane Mercer, Rosa Nascimento dos Santos, Celso von Randow, and Paul C. Stoy. "Investigating the mechanisms responsible for the lack of surface energy balance closure in a central Amazonian tropical rainforest." Agricultural & Forest Meteorology (April 2017). DOI: 10.1016/j.agrformet.2017.03.023.en_US
dc.description.abstractThis work investigates the diurnal and seasonal behavior of the energy balance residual (E) that results from the observed difference between available energy and the turbulent fluxes of sensible heat (H) and latent heat (LE) at the FLUXNET BR-Ma2 site located in the Brazilian central Amazon rainforest. The behavior of E is analyzed by extending the eddy covariance averaging length from 30 min to 4 h and by applying an Information Flow Dynamical Process Network to diagnose processes and conditions affecting E across different seasons. Results show that the seasonal turbulent flux dynamics and the Bowen ratio are primarily driven by net radiation (Rn), with substantial sub-seasonal variability. The Bowen ratio increased from 0.25 in April to 0.4 at the end of September. Extension of the averaging length from 0.5 (94.6% closure) to 4 h and thus inclusion of longer timescale eddies and mesoscale processes closes the energy balance and lead to an increase in the Bowen ratio, thus highlighting the importance of additional H to E. Information flow analysis reveals that the components of the energy balance explain between 25 and 40% of the total Shannon entropy with higher values during the wet season than the dry season. Dry season information flow from the buoyancy flux to E are 30-50% larger than that from H, indicating the potential importance of buoyancy fluxes to closing E. While the low closure highlights additional sources not captured in the flux data and random measurement errors contributing to E, the findings of the information flow and averaging length analysis are consistent with the impact of mesoscale circulations, which tend to transport more H than LE, on the lack of closure.en_US
dc.titleInvestigating the mechanisms responsible for the lack of surface energy balance closure in a central Amazonian tropical rainforesten_US
mus.citation.journaltitleAgricultural & Forest Meteorologyen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidGerken, Tobias|0000-0001-5617-186Xen_US

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