AmeriFlux Publications from the Community

A Cable-Borne Tram For Atmospheric Measurements Along Transects
Oncley, S. P., Schwenz, K., Burns, S. P., Sun, J., Monson, R. K.

A system to make atmospheric measurements from a moving trolley suspended by a stretched cable has been developed. At present, these measurements consist of wind velocity, temperature, humidity, and carbon dioxide concentration, though other sensors may be added. The track consists of cable segments attached to turns mounted on standard …

Journal: Journal Of Atmospheric And Oceanic Technology, Volume 26 (3): 462-473 (2009). DOI: 10.1175/2008JTECHA1158.1 Sites: US-NR1

A Comparison Of Water And Carbon Dioxide Exchange At A Windy Alpine Tundra And Subalpine Forest Site Near Niwot Ridge, Colorado
Blanken, P. D., Williams, M. W., Burns, S. P., Monson, R. K., Knowles, J., Chowanski, K., Ackerman, T.

Eddy covariance measurements of the surface energy balance and carbon dioxide exchange above high-elevation (3,480 m above sea level) alpine tundra located near Niwot Ridge, Colorado, were compared to simultaneous measurements made over an adjacent subalpine forest over two summers and one winter, from June 9, 2007 to July 3, 2008. …

Journal: Biogeochemistry, Volume 95 (1): 61-76 (2009). DOI: 10.1007/s10533-009-9325-9 Sites: US-NR1

An Evaluation Of Calibration Techniques For In Situ Carbon Dioxide Measurements Using A Programmable Portable Trace-Gas Measuring System
Burns, S. P., Delany, A. C., Sun, J., Stephens, B. B., Oncley, S. P., Maclean, G. D., Semmer, S. R., Schröter, J., Ruppert, J.

The construction and deployment of a portable trace-gas measurement system (TGaMS) is described. The air-collection system (dubbed HYDRA) collects air samples from 18 different locations and was connected to either one or two LI-COR LI-7000 gas analyzers to measure CO2. An in situ “field calibration” method, that uses four calibration …

Journal: Journal Of Atmospheric And Oceanic Technology, Volume 26 (2): 291-316 (2009). DOI: 10.1175/2008JTECHA1080.1 Sites: US-NR1, US-NR2

Biological And Physical Influences On The Carbon Isotope Content Of Co2 In A Subalpine Forest Snowpack, Niwot Ridge, Colorado
Bowling, D. R., Massman, W. J., Schaeffer, S. M., Burns, S. P., Monson, R. K., Williams, M. W.

Considerable research has recently been devoted to understanding biogeochemical processes under winter snow cover, leading to enhanced appreciation of the importance of many winter ecological processes. In this study, a comprehensive investigation of the stable carbon isotope composition (δ13C) of CO2 within a high-elevation subalpine …

Journal: Biogeochemistry, Volume 95 (1): 37-59 (2009). DOI: 10.1007/s10533-008-9233-4 Sites: US-NR1

Influence Of Clouds And Diffuse Radiation On Ecosystem-Atmosphere Co2and Co18o Exchanges
Still, C. J., Riley, W. J., Biraud, S. C., Noone, D. C., Buenning, N. H., Randerson, J. T., Torn, M. S., Welker, J., White, J. W., Vachon, R., Farquhar, G. D., Berry, J. A.

This study evaluates the potential impact of clouds on ecosystem CO2 and CO2 isotope fluxes (“isofluxes”) in two contrasting ecosystems (a broadleaf deciduous forest and a C4 grassland) in a region for which cloud cover, meteorological, and isotope data are available for driving the isotope‐enabled land surface model (ISOLSM). …

Journal: Journal Of Geophysical Research, Volume 114 (G1): (2009). DOI: http://doi.org/10.1029/2007JG000675 Sites: US-ARM

Regional Co2and Latent Heat Surface Fluxes In The Southern Great Plains: Measurements, Modeling, And Scaling
Riley, W. J., Biraud, S. C., Torn, M. S., Fischer, M. L., Billesbach, D. P., Berry, J. A.

Characterizing net ecosystem exchanges (NEE) of CO2 and sensible and latent heat fluxes in heterogeneous landscapes is difficult, yet critical given expected changes in climate and land use. We report here a measurement and modeling study designed to improve our understanding of surface to atmosphere gas exchanges under very heterogeneous …

Journal: Journal Of Geophysical Research, Volume 114 (G4): (2009). DOI: http://doi.org/10.1029/2009JG001003 Sites: US-ARM

An Assessment Of Corrections For Eddy Covariance Measured Turbulent Fluxes Over Snow In Mountain Environments
Reba, M. L., Link, T. E., Marks, D., Pomeroy, J.

Journal: Water Resources Research, Volume 45 (4): (2009). DOI: 10.1029/2008WR007045 Sites: US-Rwe

Whole-Ecosystem Labile Carbon Production In A North Temperate Deciduous Forest
Gough, C. M., Flower, C. E., Vogel, C. S., Dragoni, D., Curtis, P. S.

Journal: Agricultural And Forest Meteorology, Volume 149 (9): 1531-1540 (2009). DOI: 10.1016/j.agrformet.2009.04.006 Sites: US-UMB

A Comparison Of Water And Carbon Dioxide Exchange At A Windy Alpine Tundra And Subalpine Forest Site Near Niwot Ridge, Colorado
Blanken, P. D., Williams, M. W., Burns, S. P., Monson, R. K., Knowles, J. F., Chowanski, K., Ackerman, T.

Journal: Biogeochemistry, Volume 95 (1): 61-76 (2009). DOI: 10.1007/s10533-009-9325-9 Sites: US-NR1, US-NR3, US-NR4

The Ecohydrologic Significance Of Hydraulic Redistribution In A Semiarid Savanna
Scott, R. L., Cable, W. L., Hultine, K. R.

Recent studies have illuminated the process of hydraulic redistribution, defined as the translocation of soil moisture via plant root systems, but the long-term ecohydrologic significance of this process is poorly understood. We investigated hydraulic redistribution (HR) by Prosopis velutina Woot. (velvet mesquite) in an …

Journal: Water Resources Research, Volume 44 (W02440): n/a-n/a (2008). DOI: 10.1029/2007wr006149 Sites: US-SRM

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