Search Results - "Hollinger, D.Y."

Use of change-point detection for friction–velocity threshold evaluation in eddy-covariance studies by Barr, A.G., Richardson, A.D., Hollinger, D.Y., Papale, D., Arain, M.A., Black, T.A., Bohrer, G., Dragoni, D., Fischer, M.L., Gu, L., Law, B.E., Margolis, H.A., McCaughey, J.H., Munger, J.W., Oechel, W., Schaeffer, K.

“…► Friction–velocity thresholds (u*Th) are commonly used to filter nighttime NEE. ► Change-point detection (CPD) is used to improve automated u*Th evaluation. ►…”
Get full text

Evaluation of Remote Sensing Based Terrestrial Productivity From MODIS Using Regional Tower Eddy Flux Network Observations by Heinsch, Faith Ann, Zhao, Maosheng, Running, Steven W, Kimball, John S, Nemani, Ramakrishna R, Davis, Kenneth J, Bolstad, Paul V, Cook, Bruce D, Desai, Ankur R, Ricciuto, Daniel M, Law, Beverly E, Oechel, Walter C, Kwon, Hyojung, Luo, Hongyan, Wofsy, Steven C, Hollinger, David Y

“…The Moderate Resolution Spectroradiometer (MODIS) sensor has provided near real-time estimates of gross primary production (GPP) since March 2000. We compare…”
Get full text

Refining light-use efficiency calculations for a deciduous forest canopy using simultaneous tower-based carbon flux and radiometric measurements by Jenkins, J.P., Richardson, A.D., Braswell, B.H., Ollinger, S.V., Hollinger, D.Y., Smith, M.-L.

“…The concept of light-use efficiency (LUE) is the underlying basis for estimating carbon exchange in many ecosystem models, especially those models that utilize…”
Get full text

Leaf area index uncertainty estimates for model–data fusion applications by Richardson, Andrew D., Dail, D. Bryan, Hollinger, D.Y.

“…► Estimates of data uncertainties are required for model–data fusion. ► We quantified uncertainties in optical measurements of leaf area index [LAI]. ► Random…”
Get full text

Forest–atmosphere carbon dioxide exchange in eastern Siberia by Hollinger, D.Y., Kelliher, F.M., Schulze, E.-D., Bauer, G., Arneth, A., Byers, J.N., Hunt, J.E., McSeveny, T.M., Kobak, K.I., Milukova, I., Sogatchev, A., Tatarinov, F., Varlargin, A., Ziegler, W., Vygodskaya, N.N.

“…We investigated the daily exchange of CO 2 between undisturbed Larix gmelinii (Rupr.) Rupr. forest and the atmosphere at a remote Siberian site during July and…”
Get full text

Evaporation from an eastern Siberian larch forest by Kelliher, F.M., Hollinger, D.Y., Schulze, E.-D., Vygodskaya, N.N., Byers, J.N., Hunt, J.E., McSeveny, T.M., Milukova, I., Sogatchev, A., Varlargin, A., Ziegler, W., Arneth, A., Bauer, G.

“…Total forest evaporation ( λE), understorey evaporation, and environmental variables were measured on nine summer days under different weather conditions in a…”
Get full text

Net carbon dioxide losses of northern ecosystems in response to autumn warming by Piao, S, Ciais, P, Friedlingstein, P, Peylin, P, Reichstein, M, Luyssaert, S, Margolis, H, Fang, J, Barr, A, Chen, A, Grelle, A, Hollinger, D.Y

“…The carbon balance of terrestrial ecosystems is particularly sensitive to climatic changes in autumn and spring with spring and autumn temperatures over…”
Get full text

method to estimate the additional uncertainty in gap-filled NEE resulting from long gaps in the CO2 flux record by Richardson, A.D, Hollinger, D.Y

“…Missing values in any data set create problems for researchers. The process by which missing values are replaced, and the data set is made complete, is…”
Get full text

Uncertainty in eddy covariance measurements and its application to physiological models by Hollinger, D.Y, Richardson, A.D

“…Flux data are noisy, and this uncertainty is largely due to random measurement error. Knowledge of uncertainty is essential for the statistical evaluation of…”
Get full text

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…”
Get full text

Canopy nitrogen, carbon assimilation, and albedo in temperate and boreal forests: Functional relations and potential climate feedbacks by Ollinger, S.V, Richardson, A.D, Martin, M.E, Hollinger, D.Y, Frolking, S.E, Reich, P.B, Plourde, L.C, Katul, G.G, Munger, J.W, Oren, R, Smith, M.-L, Paw U, K.T, Bolstad, P.V, Cook, B.D, Day, M.C, Martin, T.A, Monson, R.K, Schmid, H.P

“…The availability of nitrogen represents a key constraint on carbon cycling in terrestrial ecosystems, and it is largely in this capacity that the role of N in…”
Get full text

Albedo estimates for land surface models and support for a new paradigm based on foliage nitrogen concentration by Hollinger, D.Y, Ollinger, S.V, Richardson, A.D, Meyers, T.P, Dail, D.B, Martin, M.E, Scott, N.A, Arkebauer, T.J, Baldocchi, D.D, Clark, K.L, Curtis, P.S, Davis, K.J, Desai, A.R, Dragoni, D, Goulden, M.L, Gu, L, Katul, G.G, Pallard, S.G, Paw U., K.T, Schmid, H.P, Stoy, P.C, Suyker, A.E, Verma, S.B

“…Vegetation albedo is a critical component of the Earth's climate system, yet efforts to evaluate and improve albedo parameterizations in climate models have…”
Get full text

Statistical modeling of ecosystem respiration using eddy covariance data: Maximum likelihood parameter estimation, and Monte Carlo simulation of model and parameter uncertainty, applied to three simple models by Richardson, Andrew D., Hollinger, David Y.

“…Whether the goal is to fill gaps in the flux record, or to extract physiological parameters from eddy covariance data, researchers are frequently interested in…”
Get full text

distinct seasonal pattern of the ratio of soil respiration to total ecosystem respiration in a spruce-dominated forest by Davidson, E.A, Richardson, A.D, Savage, K.E, Hollinger, D.Y

“…Annual budgets and fitted temperature response curves for soil respiration and ecosystem respiration provide useful information for partitioning annual carbon…”
Get full text

Spatial and temporal variability in forest-atmosphere CO₂ exchange. [Erratum: 2004 Nov., v. 10, no. 11, p. 1961.] by Hollinger, D.Y, Aber, J, Dail, B, Davidson, E.A, Goltz, S.M, Hughes, H, Leclerc, M.Y, Lee, J.T, Richardson, A.D, Rodrigues, C

“…Seven years of carbon dioxide flux measurements indicate that a approximaely 90-year-old spruce dominated forest in Maine, USA, has been sequestering 174±46 g…”
Get full text

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…”
Get full text

Seasonal patterns and environmental control of carbon dioxide and water vapour exchange in an ecotonal boreal forest by Hollinger, D.Y, Goltz, S.M, Davidson, E.A, Lee, S.J.T, Tu, K, Valentine, H.T

“…Carbon dioxide, water vapour, and sensible heat fluxes were measured above and within a spruce dominated forest near the southern ecotone of the boreal forest…”
Get full text

Midday values of gross CO2 flux and light use efficiency during satellite overpasses can be used to directly estimate eight-day mean flux by Sims, D.A, Rahman, A.F, Cordova, V.D, Baldocchi, D.D, Flanagan, L.B, Goldstein, A.H, Hollinger, D.Y, Misson, L, Monson, R.K, Schmid, H.P

“…Most satellites provide, at best, a single daily snapshot of vegetation and, at worst, these snapshots may be separated by periods of many days when the ground…”
Get full text

An improved state-parameter analysis of ecosystem models using data assimilation by Chen, M., Liu, S., Tieszen, L.L., Hollinger, D.Y.

“…Much of the effort spent in developing data assimilation methods for carbon dynamics analysis has focused on estimating optimal values for either model…”
Get full text

Optimality and nitrogen allocation in a tree canopy by Hollinger, D.Y

“…Physical and functional properties of foliage were measured at a variety of microsites in a broad-leaved Nothofagus (Hook. f.) Orst. canopy. The light climate…”
Get full text