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Seasonal And Interannual Variability In 13c Composition Of Ecosystem Carbon Fluxes In The U.S. Southern Great Plains

by W. Stephen Chan - November 7, 2019

The δ13C value of terrestrial CO2 fluxes (δbio) provides important information for inverse models of CO2 sources and sinks as well as for studies of vegetation physiology, C3 and C4… More

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Biases In Regional Carbon Budgets From Covariation Of Surface Fluxes And Weather In Transport Model Inversions

by W. Stephen Chan - November 7, 2019

Recent advances in atmospheric transport model inversions could significantly reduce uncertainties in land carbon uptake through the assimilation of CO2 concentration measurements at weekly and shorter timescales. The potential of… More

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Role Of Surface Energy Exchange For Simulating Wind Turbine Inflow: A Case Study In The Southern Great Plains, Usa

by W. Stephen Chan - November 7, 2019

he Weather Research and Forecasting (WRF) model is used to investigate choice of land surface model (LSM) on the near surface wind profile, including heights reached by multi-megawatt (MW) wind… More

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Greenness Indices From Digital Cameras Predict The Timing And Seasonal Dynamics Of Canopy-Scale Photosynthesis

by W. Stephen Chan - November 7, 2019

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… More

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Separating The Effects Of Phenology And Diffuse Radiation On Gross Primary Productivity In Winter Wheat

by W. Stephen Chan - November 7, 2019

Gross primary productivity (GPP) has been reported to increase with the fraction of diffuse solar radiation, for a given total irradiance. The correlation between GPP and diffuse radiation suggests effects… More

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Land-Atmosphere Coupling And Climate Prediction Over The U.S. Southern Great Plains

by W. Stephen Chan - November 7, 2019

Biases in land‐atmosphere coupling in climate models can contribute to climate prediction biases, but land models are rarely evaluated in the context of this coupling. We tested land‐atmosphere coupling and… More

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Does Vapor Pressure Deficit Drive The Seasonality Of δ13C Of The Net Land-Atmosphere Co2 Exchange Across The United States?

by W. Stephen Chan - November 7, 2019

The seasonal pattern of the carbon isotope content (δ13C) of atmospheric CO2 depends on local and nonlocal land‐atmosphere exchange and atmospheric transport. Previous studies suggested that the δ13C of the… More

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Closing The Scale Gap Between Land Surface Parameterizations And Gcms With A New Scheme, Sib3-Bins

by W. Stephen Chan - November 7, 2019

The interaction of land with the atmosphere is sensitive to soil moisture (W). Evapotranspiration (ET) reacts to soil moisture in a nonlinear way, f(W), as soils dry from saturation to… More

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Carbon Flux Phenology From The Sky: Evaluation For Maize And Soybean

by W. Stephen Chan - November 7, 2019

Carbon flux phenology is widely used to understand carbon flux dynamics and surface exchange processes. Vegetation phenology has been widely evaluated by remote sensors; however, very few studies have evaluated… More

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Recovering Evapotranspiration Trends From Biased CMIP5 Simulations And Sensitivity To Changing Climate Over North America

by Anonymous - July 31, 2019

Future projections of evapotranspiration (ET) are of critical importance for agricultural and freshwater management and for predicting land–atmosphere feedbacks on the climate system. However, ET from phase 5 of the… More

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