AmeriFlux Publications from the Community

Remote Sensing Products Validated by Flux Tower Data in Amazon Rain Forest
Victor Hugo da Motta Paca, Gonzalo E. Espinoza-Dávalos, Rodrigo da Silva,Raphael Tapajós, Avner Brasileiro dos Santos Gaspar

This work compares methods of climate measurements, such as those used to measure evapotranspiration, precipitation, net radiation, and temperature. The satellite products used were compared and evaluated against flux tower data. Evapotranspiration was validated against the SSEBop monthly and GLEAM daily and monthly products, respectively, …

Journal: Remote Sensing, Volume 14 (5): 1259 (2022), ISBN . DOI: 10.3390/rs14051259 Sites: BR-Sa1

The Spatial Variability Of Actual Evapotranspiration Across The Amazon River Basin Based On Remote Sensing Products Validated With Flux Towers
Paca, V. H., Espinoza-Dávalos, G. E., Hessels, T. M., Moreira, D. M., Comair, G. F., Bastiaanssen, W. G.

Actual evapotranspiration (ET) is a major component of the water balance. While several international flux measurement programs have been executed in the tropical rain forest of the Amazon, those measurements represent the evaporative process at a few selected sites only. The aim of this study is to obtain the spatial distribution …

Journal: Ecological Processes, Volume 8 (1): 20 (2019), ISBN . DOI: 10.1186/s13717-019-0158-8 Sites: BR-Ma2, BR-Sa1, BR-Sa3

The Spatial Variability Of Actual Evapotranspiration Across The Amazon River Basin Based On Remote Sensing Products Validated With Flux Towers
Paca, V. H., Espinoza-Dávalos, G. E., Hessels, T. M., Moreira, D. M., Comair, G. F., Bastiaanssen, W. G.

Actual evapotranspiration (ET) is a major component of the water balance. While several international flux measurement programs have been executed in the tropical rain forest of the Amazon, those measurements represent the evaporative process at a few selected sites only. The aim of this study is to obtain the spatial distribution …

Journal: Ecological Processes, Volume 8 (1): (2019), ISBN . DOI: https://doi.org/10.1186/s13717-019-0158-8 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Carbon Exchange In An Amazon Forest: From Hours To Years
Hayek, M. N., Longo, M., Wu, J., Smith, M. N., Restrepo-Coupe, N., Tapajós, R., da Silva, R., Fitzjarrald, D. R., Camargo, P. B., Hutyra, L. R., Alves, L. F., Daube, B., Munger, J. W., Wiedemann, K. T., Saleska, S. R., Wofsy, S. C.

In Amazon forests, the relative contributions of climate, phenology, and disturbance to net ecosystem exchange of carbon (NEE) are not well understood. To partition influences across various timescales, we use a statistical model to represent eddy-covariance-derived NEE in an evergreen eastern Amazon forest as a constant response …

Journal: Biogeosciences, Volume 15 (15): 4833-4848 (2018), ISBN . DOI: https://doi.org/10.5194/bg-15-4833-2018 Sites: BR-Sa1

Temporal Dynamics Of Aerodynamic Canopy Height Derived From Eddy Covariance Momentum Flux Data Across North American Flux Networks
Chu, H., Baldocchi, D. D., Poindexter, C., Abraha, M., Desai, A. R., Bohrer, G., Arain, M. A., Griffis, T., Blanken, P. D., O'Halloran, T. L., Thomas, R. Q., Zhang, Q., Burns, S. P., Frank, J. M., Christian, D., Brown, S., Black, T. A., Gough, C. M., Law, B. E., Lee, X., Chen, J., Reed, D. E., Massman, W. J., Clark, K., Hatfield, J., Prueger, J., Bracho, R., Baker, J. M., Martin, T. A.

Aerodynamic canopy height (ha) is the effective height of vegetation canopy for its influence on atmospheric fluxes and is a key parameter of surface‐atmosphere coupling. However, methods to estimate ha from data are limited. This synthesis evaluates the applicability and robustness of the calculation of ha from eddy covariance …

Journal: Geophysical Research Letters, Volume 45: 9275–9287 (2018), ISBN . DOI: 10.1029/2018GL079306 Sites: BR-Sa1, BR-Sa3, CA-Ca1, CA-Ca2, CA-Ca3, CA-Cbo, CA-ER1, CA-Gro, CA-Man, CA-NS1, CA-NS2, CA-NS3, CA-NS4, CA-NS5, CA-Oas, CA-Obs, CA-Ojp, CA-Qfo, CA-TP1, CA-TP3, CA-TP4, CA-TPD, US-Blo, US-Bn1, US-Bn2, US-Br1, US-Br3, US-Ced, US-CPk, US-CRT, US-Dix, US-Dk2, US-Dk3, US-Fmf, US-Fuf, US-GBT, US-GLE, US-GMF, US-Ha1, US-Ha2, US-Ho2, US-Ho3, US-IB1, US-IB2, US-KL1, US-KL2, US-KL3, US-KM1, US-KM2, US-KM3, US-KM4, US-Me2, US-Me3, US-Me4, US-Me5, US-Me6, US-MMS, US-MRf, US-NC1, US-NC2, US-Ne1, US-Ne2, US-Ne3, US-NR1, US-Oho, US-Prr, US-Ro1, US-Ro3, US-SB1, US-Shd, US-Skr, US-Slt, US-SP1, US-SP2, US-SP3, US-SRM, US-Srr, US-Syv, US-Ton, US-Tw3, US-Twt, US-UMB, US-UMd, US-Var, US-Vcm, US-WBW, US-Wi0, US-Wi1, US-Wi3, US-Wi4, US-Wi5, US-Wi8, US-Wi9, US-Wrc

A Novel Correction For Biases In Forest Eddy Covariance Carbon Balance
Hayek, M. N., Wehr, R., Longo, M., Hutyra, L. R., Wiedemann, K., Munger, J. W., Bonal, D., Saleska, S. R., Fitzjarrald, D. R., Wofsy, S. C.

Journal: Agricultural And Forest Meteorology, Volume 250-251: 90-101 (2018), ISBN . DOI: 10.1016/j.agrformet.2017.12.186 Sites: BR-Sa1, US-Ha1

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), ISBN . DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

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), ISBN . DOI: 10.5194/bg-2-175-2005 Sites: BR-Sa1, BR-Sa3

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), ISBN . 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), ISBN . DOI: 10.1890/01-6012 Sites: BR-Ma2, BR-Sa1, BR-Sa3

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