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Filters: Sites: BR-Sa1

Publications Found: 23

What Drives the Seasonality of Photosynthesis Across the Amazon Basin? A Cross-Site Analysis of Eddy Flux Tower Measurements from the Brasil Flux Network
Restrepo-Coupe, N., da Rocha, H. R., Hutyra, L. R., da Araujo, A. C., Borma, L. S., Christoffersen, B., Cabral, O. M., de Camargo, P. B., Cardoso, F. L., da Costa, A. C., Fitzjarrald, D. R., Goulden, M. L., Kruijt, B., Maia, J. M., Malhi, Y. S., Manzi, A. O., Miller, S. D., Nobre, A. D., von Randow, C., Sá, L. D., Sakai, R. K., Tota, J., Wofsy, S. C., Zanchi, F. B., Saleska, S. R.

We investigated the seasonal patterns of Amazonian forest photosynthetic activity, and the effects thereon of variations in climate and land-use, by integrating data from a network of ground-based eddy flux towers in Brazil established as part of the ‘Large-Scale Biosphere Atmosphere Experiment in Amazonia’ project. We found …

Journal: Agricultural and Forest Meteorology, Volume 182-183: 128-144 (2013). DOI: https://doi.org/10.1016/j.agrformet.2013.04.031 Sites: BR-Cax, BR-Ji1, BR-Ji3, BR-Ma2, BR-Sa1, BR-Sa3

Nitrous Oxide Fluxes And Nitrogen Cycling Along A Pasture Chronosequence In Central Amazonia, Brazil
Wick, B., Veldkamp, E., Mello, W. Z. De, Keller, M., Crill, P.

Journal: Biogeosciences, Volume 2 (2): 175-187 (2005). DOI: 10.5194/bg-2-175-2005 Sites: BR-Sa1, BR-Sa3

Objective Threshold Determination For Nighttime Eddy Flux Filtering
Gu, L., Falge, E. M., Boden, T., Baldocchi, D. D., Black, T., Saleska, S. R., Suni, T., Verma, S. B., Vesala, T., Wofsy, S. C., Xu, L.

We recommend an automated statistical method (Moving Point Test, or MPT) to determine the friction velocity (u_*) thresholds in nighttime eddy flux filtering. Our intention is to make the determination of the u_* thresholds objective and reproducible and to keep flux treatment consistent over …

Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 179-197 (2005). DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

Ecological Research In The Large-Scale Biosphere– Atmosphere Experiment In Amazonia: Early Results
Keller, M., Alencar, A., Asner, G. P., Braswell, B., Bustamante, M., Davidson, E., Feldpausch, T., Fernandes, E., Goulden, M., Kabat, P., Kruijt, B., Luizão, F., Miller, S., Markewitz, D., Nobre, A. D., Nobre, C. A., Priante Filho, N., da Rocha, H., Silva Dias, P., von Randow, C., Vourlitis, G. L.

The Large-scale Biosphere–Atmosphere Experiment in Amazonia (LBA) is a multinational, interdisciplinary research program led by Brazil. Ecological studies in LBA focus on how tropical forest conversion, …

Journal: Ecological Applications, Volume 14 (sp4): 3-16 (2004). DOI: 10.1890/03-6003 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Respiration From A Tropical Forest Ecosystem: Partitioning Of Sources And Low Carbon Use Efficiency
Chambers, J. Q., Tribuzy, E. S., Toledo, L. C., Crispim, B. F., Higuchi, N., Santos, J. d., Araújo, A. C., Kruijt, B., Nobre, A. D., Trumbore, S. E.

Understanding how tropical forest carbon balance will respond to global change requires knowledge of individual heterotrophic and autotrophic respiratory sources, together with factors that control respiratory …

Journal: Ecological Applications, Volume 14 (sp4): 72-88 (2004). DOI: 10.1890/01-6012 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Remote Measurement Of Energy And Carbon Flux From Wildfires In Brazil
Riggan, P. J., Tissell, R. G., Lockwood, R. N., Brass, J. A., Pereira, J. A., Miranda, H. S., Miranda, A. C., Campos, T., Higgins, R.

Temperature, intensity, spread, and dimensions of fires burning in tropical savanna and slashed tropical forest in central Brazil were measured for the first time by remote sensing with an infrared imaging spectrometer that was designed to accommodate the high radiances of wildland fires. Furthermore, the first in situ airborne measurements …

Journal: Ecological Applications, Volume 14 (3): 855-872 (2004). DOI: 10.1890/02-5162 Sites: BR-Sa1, BR-Sa3

Seasonal And Depth Variation Of Soil Moisture In A Burned Open Savanna (Campo Sujo) In Central Brazil
Quesada, C. A., Miranda, A. C., Hodnett, M. G., Santos, A. J., Miranda, H. S., Breyer, L. M.

The soil water regimes of two areas of open savanna (campo sujo) near Brasilia, Brazil, were monitored between August 1999 and November 2000. Each area was subjected to a different fire regime. Soil water …

Journal: Ecological Applications, Volume 14 (sp4): 33-41 (2004). DOI: 10.1890/01-6017 Sites: BR-Sa1

Radon Fluxes In Tropical Forest Ecosystems Of Brazilian Amazonia: Night-Time CO2 Net Ecosystem Exchange Derived From Radon And Eddy Covariance Methods
Martens, C. S., Shay, T. J., Mendlovitz, H. P., Matross, D. M., Saleska, S. R., Wofsy, S. C., Woodward, W. S., Menton, M. C., De Moura, J. M., Crill, P. M., De Moraes, O. L., Lima, R. L.

Radon-222 (Rn-222) is used as a transport tracer of forest canopy–atmosphere CO₂ exchange in an old-growth, tropical rain forest site near km 67 of the Tapajós National Forest, Pará, Brazil. Initial results, from month-long periods at the end of the wet season (June–July) and the end of the dry season (November–December) …

Journal: Global Change Biology, Volume 10 (5): 618-629 (2004). DOI: 10.1111/j.1365-2486.2004.00764.x Sites: BR-Sa1

Effects Of Meteorological Variations On The CO2 Exchange Of A Brazilian Transitional Tropical Forest
Vourlitis, G. L., Priante Filho, N., Hayashi, M. M., Nogueira, J. d., Raiter, F., Hoegel, W., Campelo, Jr, J. H.

The net ecosystem CO₂ exchange (NEE) of a 28–30 m tall transitional (ecotonal) tropical forest of the Brazilian Amazon was quantified using tower-based eddy covariance. Measurements were made …

Journal: Ecological Applications, Volume 14 (sp4): 89-100 (2004). DOI: 10.1890/01-6005 Sites: BR-Sa1, BR-Sa3

The Robustness Of Eddy Correlation Fluxes For Amazon Rain Forest Conditions
Kruijt, B., Elbers, J. A., von Randow, C., Araújo, A. C., Oliveira, P. J., Culf, A., Manzi, A. O., Nobre, A. D., Kabat, P., Moors, E. J.

We analyzed errors and uncertainties in time-integrated eddy correlation data for sites in the Amazon. A well-known source of potential error in eddy correlation is through possible advective losses of CO₂emissions during calm nights. There are also questions related to the treatment of low frequencies, non-horizontal …

Journal: Ecological Applications, Volume 14 (sp4): 101-113 (2004). DOI: 10.1890/02-6004 Sites: BR-Ma2, BR-Sa1, BR-Sa3

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