Search Results - "Braswell, Bobby"

Linking near-surface and satellite remote sensing measurements of deciduous broadleaf forest phenology by Hufkens, Koen, Friedl, Mark, Sonnentag, Oliver, Braswell, Bobby H., Milliman, Thomas, Richardson, Andrew D.

“…Green leaf phenology is known to be sensitive to climate variation. Phenology is also important because it exerts significant control on terrestrial carbon…”
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Digital repeat photography for phenological research in forest ecosystems by Sonnentag, Oliver, Hufkens, Koen, Teshera-Sterne, Cory, Young, Adam M., Friedl, Mark, Braswell, Bobby H., Milliman, Thomas, O’Keefe, John, Richardson, Andrew D.

“…► The green chromatic coordinate ( g cc ) suppresses changes in scene illumination. ► We propose per90 to further minimize these effects in time series of g cc…”
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Near-Surface Remote Sensing of Spatial and Temporal Variation in Canopy Phenology by Richardson, Andrew D., Braswell, Bobby H., Hollinger, David Y., Jenkins, Julian P., Ollinger, Scott V.

“…There is a need to document how plant phenology is responding to global change factors, particularly warming trends. "Near-surface" remote sensing, using…”
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Use of digital webcam images to track spring green-up in a deciduous broadleaf forest by Richardson, Andrew D, Jenkins, Julian P, Braswell, Bobby H, Hollinger, David Y, Ollinger, Scott V, Smith, Marie-Louise

“…Understanding relationships between canopy structure and the seasonal dynamics of photosynthetic uptake of CO₂ by forest canopies requires improved knowledge…”
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Spatial analysis of growing season length control over net ecosystem exchange by Churkina, Galina, Schimel, David, Braswell, Bobby H., Xiao, Xiangming

“…Using data from 28 flux measurement sites, we performed an analysis of the relationship between annual net ecosystem exchange (NEE) and the length of the…”
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Comprehensive comparison of gap-filling techniques for eddy covariance net carbon fluxes by Moffat, Antje M., Papale, Dario, Reichstein, Markus, Hollinger, David Y., Richardson, Andrew D., Barr, Alan G., Beckstein, Clemens, Braswell, Bobby H., Churkina, Galina, Desai, Ankur R., Falge, Eva, Gove, Jeffrey H., Heimann, Martin, Hui, Dafeng, Jarvis, Andrew J., Kattge, Jens, Noormets, Asko, Stauch, Vanessa J.

“…We review 15 techniques for estimating missing values of net ecosystem CO 2 exchange (NEE) in eddy covariance time series and evaluate their performance for…”
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Environmental variation is directly responsible for short- but not long-term variation in forest-atmosphere carbon exchange by Richardson, Andrew D, Hollinger, David Y, Aber, John D, Ollinger, Scott V, Braswell, Bobby H

“…Tower-based eddy covariance measurements of forest-atmosphere carbon dioxide (CO₂) exchange from many sites around the world indicate that there is…”
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Estimating diurnal to annual ecosystem parameters by synthesis of a carbon flux model with eddy covariance net ecosystem exchange observations by Braswell, B.H, Sacks, W.J, Linder, E, Schimel, D.S

“…We performed a synthetic analysis of Harvard Forest net ecosystem exchange of CO2 (NEE) time series and a simple ecosystem carbon flux model, the simplified…”
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Evaluating multiple causes of persistent low microwave backscatter from Amazon forests after the 2005 drought by Frolking, Steve, Hagen, Stephen, Braswell, Bobby, Milliman, Tom, Herrick, Christina, Peterson, Seth, Roberts, Dar, Keller, Michael, Palace, Michael

“…Amazonia has experienced large-scale regional droughts that affect forest productivity and biomass stocks. Space-borne remote sensing provides basin-wide data…”
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Integrating waveform lidar with hyperspectral imagery for inventory of a northern temperate forest by Anderson, Jeanne E., Plourde, Lucie C., Martin, Mary E., Braswell, Bobby H., Smith, Marie-Louise, Dubayah, Ralph O., Hofton, Michelle A., Blair, J. Bryan

“…It has been suggested that attempts to use remote sensing to map the spatial and structural patterns of individual tree species abundances in heterogeneous…”
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Joint data assimilation of satellite reflectance and net ecosystem exchange data constrains ecosystem carbon fluxes at a high-elevation subalpine forest by Zobitz, J.M., Moore, David J.P., Quaife, Tristan, Braswell, Bobby H., Bergeson, Andrew, Anthony, Jeremy A., Monson, Russell K.

“…[Display omitted] •NEE and satellite reflectance data constrain terrestrial ecosystem carbon fluxes.•Wavelet analyses show correlation of modeled values across…”
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Prolonged suppression of ecosystem carbon dioxide uptake after an anomalously warm year by Arnone, John A. III, Verburg, Paul S.J, Johnson, Dale W, Larsen, Jessica D, Jasoni, Richard L, Lucchesi, Annmarie J, Batts, Candace M, von Nagy, Christopher, Coulombe, William G, Schorran, David E

“…Terrestrial ecosystems control carbon dioxide fluxes to and from the atmosphere through photosynthesis and respiration, a balance between net primary…”
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Statistical properties of random CO2 flux measurement uncertainty inferred from model residuals by Richardson, A.D, Mahecha, M.D, Falge, E, Kattge, J, Moffat, A.M, Papale, D, Reichstein, M, Stauch, V.J, Braswell, B.H, Churkina, G

“…Information about the uncertainties associated with eddy covariance measurements of surface-atmosphere CO₂ exchange is needed for data assimilation and inverse…”
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Trends in wintertime climate in the northeastern United States: 1965–2005 by Burakowski, Elizabeth A., Wake, Cameron P., Braswell, Bobby, Brown, David P.

“…Humans experience climate variability and climate change primarily through changes in weather at local and regional scales. One of the most effective means to…”
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Comparing simple respiration models for eddy flux and dynamic chamber data by Richardson, Andrew D., Braswell, Bobby H., Hollinger, David Y., Burman, Prabir, Davidson, Eric A., Evans, Robert S., Flanagan, Lawrence B., Munger, J. William, Savage, Kathleen, Urbanski, Shawn P., Wofsy, Steven C.

“…Selection of an appropriate model for respiration ( R) is important for accurate gap-filling of CO 2 flux data, and for partitioning measurements of net…”
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The value of multiangle measurements for retrieving structurally and radiatively consistent properties of clouds, aerosols, and surfaces by Diner, David J., Braswell, Bobby H., Davies, Roger, Gobron, Nadine, Hu, Jiannan, Jin, Yufang, Kahn, Ralph A., Knyazikhin, Yuri, Loeb, Norman, Muller, Jan-Peter, Nolin, Anne W., Pinty, Bernard, Schaaf, Crystal B., Seiz, Gabriela, Stroeve, Julienne

“…Passive optical multiangle observations make possible the retrieval of scene structural characteristics that cannot be obtained with, or require fewer…”
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Comparing CO2 retrieved from Atmospheric Infrared Sounder with model predictions: Implications for constraining surface fluxes and lower-to-upper troposphere transport by Tiwari, Yogesh K., Gloor, Manuel, Engelen, Richard J., Chevallier, Frederic, Rödenbeck, Christian, Körner, Stefan, Peylin, Philippe, Braswell, Bobby H., Heimann, Martin

“…Large‐scale carbon sources and sinks can be estimated by combining atmospheric CO2 concentration data with atmospheric transport inverse modeling. This…”
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Sensitivity of vegetation indices to atmospheric aerosols: continental-scale observations in Northern Asia by Xiao, Xiangming, Braswell, Bobby, Zhang, Qingyuan, Boles, Stephen, Frolking, Stephen, Moore, Berrien

“…Satellite observations play an important role in characterization of the interannual variation of vegetation. Here, we report anomalies of two vegetation…”
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Model-data synthesis of diurnal and seasonal CO₂ fluxes at Niwot Ridge, Colorado by Sacks, William J, Schimel, David S, Monson, Russell K, Braswell, Bobby H

“…Eddy covariance records hold great promise for understanding the processes controlling the net ecosystem exchange of CO₂ (NEE). However, NEE is the small…”
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Nitrogen deposition onto the United States and Western Europe: synthesis of observations and models by Holland, E.A, Braswell, B.H, Sulzman, J, Lamarque, J.F

“…The documented acceleration of NH3and$NO_x (NO + NO_2)$emissions over the last 150 years has accelerated N deposition, compromising air and water quality and…”
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