AmeriFlux Publications from the Community

Seasonal fluxes of carbonyl sulfide in a midlatitude forest
Commane, R.C., Meredith, L. K., Baker, I. T., Berry, J. A., Munger, J. W, Montzka, S. A, Templer, P. H., Juice, S. M., Zahniser, M. S., Wofsy, S. C.

Carbonyl sulfide (OCS), the most abundant sulfur gas in the
atmosphere, has a summer minimum associated with uptake by
vegetation and soils, closely correlated with CO 2 . We report the
first direct measurements to our knowledge of the ecosystem flux
of OCS throughout an annual cycle, at a mixed temperate forest.
The forest …

Journal: PNAS, Volume : 1-7 (2015), ISBN . DOI: 10.1073/pnas.1504131112 Sites: US-Ha1

Probing The Past 30-Year Phenology Trend Of Us Deciduous Forests
Yue, X., Unger, N., Keenan, T. F., Zhang, X., Vogel, C. S.

Phenology is experiencing dramatic changes over deciduous forests in the USA. Estimates of trends in phenology on the continental scale are uncertain, however, with studies failing to agree on both the magnitude and spatial distribution of trends in spring and autumn. This is due to
the sparsity of in situ records, …

Journal: Biogeosciences, Volume 12 (15): 4693-4709 (2015), ISBN . DOI: 10.5194/bg-12-4693-2015 Sites: US-Ha1, US-MMS, US-MOz, US-UMB

Greenness Indices From Digital Cameras Predict The Timing And Seasonal Dynamics Of Canopy-Scale Photosynthesis
Toomey, M., Friedl, M. A., Frolking, S., Hufkens, K., Klosterman, S., Sonnentag, O., Baldocchi, D. D., Bernacchi, C. J., Biraud, S. C., Bohrer, G., Brzostek, E., Burns, S. P., Coursolle, C., Hollinger, D. Y., Margolis, H. A., McCaughey, H., Monson, R. K., Munger, J. W., Pallardy, S., Phillips, R. P., Torn, M. S., Wharton, S., Zeri, M., Richardson, A. D.

The proliferation of digital cameras co‐located with eddy covariance instrumentation provides new opportunities to better understand the relationship between canopy phenology and the seasonality of canopy photosynthesis. In this paper we analyze the abilities and limitations of canopy color metrics measured by digital repeat photography …

Journal: Ecological Applications, Volume 25 (1): 99-115 (2015), ISBN . DOI: http://doi.org/10.1890/14-0005.1 Sites: US-ARM, US-Bar, US-Ha1, US-Ho1, US-MMS, US-MOz, US-NR1, US-UMB, US-UMd, US-Var, US-Wrc

Tree-Ring δ 13c Tracks Flux Tower Ecosystem Productivity Estimates In A Ne Temperate Forest
Belmecheri, S., Maxwell, R. S., Taylor, A. H., Davis, K. J., Freeman, K. H., Munger, W. J.

We investigated relationships between tree-ring δ13C and growth, and flux tower estimates of gross primary productivity (GPP) at Harvard Forest from 1992 to 2010. Seasonal variations of derived photosynthetic isotope discrimination (Δ13C) and leaf intercellular CO2 concentration (c i ) showed significant increasing trends for the …

Journal: Environmental Research Letters, Volume 9 (7): 074011 (2014), ISBN . DOI: 10.1088/1748-9326/9/7/074011 Sites: US-Ha1

Characterizing The Diurnal Patterns of Errors in The Prediction of Evapotranspiration by Several Land-Surface Models: An Nacp Analysis
Matheny, A. M., Bohrer, G., Stoy, P. C., Baker, I. T., Black, A. T., Desai, A. R., Dietze, M. C., Gough, C. M., Ivanov, V. Y., Jassal, R. S., Novick, K. A., Schäfer, K. V., Verbeeck, H.

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (7): 1458-1473 (2014), ISBN . DOI: 10.1002/2014JG002623 Sites: CA-Ca1, CA-Gro, CA-Let, CA-Oas, CA-Ojp, CA-Qfo, US-ARM, US-Dk3, US-Ha1, US-Ho1, US-IB2, US-Me2, US-MMS, US-MOz, US-Ne1, US-Ne2, US-Ne3, US-NR1, US-PFa, US-Syv, US-Ton, US-UMB, US-Var, US-WCr

Use Of Change-Point Detection For Friction–Velocity Threshold Evaluation In Eddy-Covariance Studies
Barr, A., Richardson, A., Hollinger, D., Papale, D., Arain, M., Black, T., Bohrer, G., Dragoni, D., Fischer, M., Gu, L., Law, B., Margolis, H., McCaughey, J., Munger, J., Oechel, W., Schaeffer, K.

Journal: Agricultural And Forest Meteorology, Volume 171-172: 31-45 (2013), ISBN . DOI: 10.1016/j.agrformet.2012.11.023 Sites: CA-Ca1, CA-Ca2, CA-Ca3, CA-Gro, CA-Let, CA-Mer, CA-NS1, CA-Oas, CA-Obs, CA-Ojp, CA-Qfo, CA-SJ1, CA-SJ2, CA-SJ3, CA-TP4, CA-WP1, US-ARM, US-Dk3, US-Ha1, US-Ho1, US-IB1, US-Los, US-Me3, US-Me5, US-MMS, US-MOz, US-Ne1, US-Ne2, US-Ne3, US-NR1, US-Shd, US-SO2, US-Syv, US-Ton, US-UMB, US-Var, US-WCr

Increase In Forest Water-Use Efficiency As Atmospheric Carbon Dioxide Concentrations Rise
Keenan, T. F., Hollinger, D. Y., Bohrer, G., Dragoni, D., Munger, J. W., Schmid, H. P., Richardson, A. D.

Journal: Nature, Volume 499 (7458): 324-327 (2013), ISBN . DOI: 10.1038/nature12291 Sites: CA-Man, US-Bar, US-Blo, US-Ha1, US-Ha2, US-Ho1, US-MMS, US-UMB, US-WCr

Comparison Of Soil Organic Matter Dynamics At Five Temperate Deciduous Forests With Physical Fractionation And Radiocarbon Measurements
McFarlane, K. J., Torn, M. S., Hanson, P. J., Porras, R. C., Swanston, C. W., Callaham, M. A., Guilderson, T. P.

Forest soils represent a significant pool for carbon sequestration and storage, but the factors controlling soil carbon cycling are not well constrained. We compared soil carbon dynamics at five broadleaf forests in the Eastern US that vary in climate, soil type, and soil ecology: two sites at the University of Michigan Biological …

Journal: Biogeochemistry, Volume 112 (1-3): 457-476 (2013), ISBN . DOI: 10.1007/s10533-012-9740-1 Sites: US-Bar, US-Ha1, US-MOz, US-UMB

Terrestrial Biosphere Models Need Better Representation Of Vegetation Phenology: Results From The North American Carbon Program Site Synthesis
Richardson, A. D., Anderson, R. S., Arain, M. A., Barr, A. G., Bohrer, G., Chen, G., Chen, J. M., Ciais, P., Davis, K. J., Desai, A. R., Dietze, M. C., Dragoni, D., Garrity, S. R., Gough, C. M., Grant, R., Hollinger, D. Y., Margolis, H. A., McCaughey, H., Migliavacca, M., Monson, R. K., Munger, J. W., Poulter, B., Raczka, B. M., Ricciuto, D. M., Sahoo, A. K., Schaefer, K., Tian, H., Vargas, R., Verbeeck, H., Xiao, J., Xue, Y.

Journal: Global Change Biology, Volume 18 (2): 566-584 (2012), ISBN . DOI: 10.1111/j.1365-2486.2011.02562.x Sites: CA-Oas, CA-Obs, CA-Ojp, CA-Qfo, US-Ha1, US-Ho1, US-MMS, US-NR1, US-UMB, US-WCr

Using Model-Data Fusion To Interpret Past Trends, And Quantify Uncertainties In Future Projections, Of Terrestrial Ecosystem Carbon Cycling
Keenan, T. F., Davidson, E., Moffat, A. M., Munger, W., Richardson, A. D.

Uncertainties in model projections of carbon cycling in terrestrial ecosystems stem from inaccurate parameterization of incorporated processes (endogenous uncertainties) and processes or drivers that are not accounted for by the model (exogenous uncertainties). Here, we assess endogenous and exogenous uncertainties using a model-data …

Journal: Global Change Biology, Volume 18 (8): 2555-2569 (2012), ISBN . DOI: 10.1111/j.1365-2486.2012.02684.x Sites: US-Ha1

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