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Publications Found: 1371
Net Ecosystem Methane And Carbon Dioxide Exchanges In A Lake Erie Coastal Marsh And A Nearby Cropland
Chu, H., Chen, J., Gottgens, J. F., Ouyang, Z., John, R., Czajkowski, K., Becker, R.

Net ecosystem carbon dioxide (FCO2) and methane (FCH4) exchanges were measured by using the eddy covariance method to quantify the atmospheric carbon budget at a Typha– and Nymphaea-dominated freshwater marsh (March 2011 to March 2013) and a soybean cropland (May 2011 to May 2012) in northwestern …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (5): 722-740 (2014), ISBN . DOI: 10.1002/2013JG002520 Sites: US-CRT, US-WPT

Long-Term Variability And Environmental Control Of The Carbon Cycle In An Oak-Dominated Temperate Forest
Xie, J., Chen, J., Sun, G., Chu, H., Noormets, A., Ouyang, Z., John, R., Wan, S., Guan, W.

Our understanding of the long-term carbon (C) cycle of temperate deciduous forests and its sensitivity to climate variability is limited due to the large temporal dynamics of C fluxes. The goal of the study was to quantify the effects of environmental variables on …


Journal: Forest Ecology And Management, Volume 313 (1): 319-328 (2014), ISBN . DOI: 10.1016/j.foreco.2013.10.032 Sites: US-Oho

Data-Based Perfect-Deficit Approach To Understanding Climate Extremes And Forest Carbon Assimilation Capacity
Wei, S., Yi, C., Hendrey, G., Eaton, T., Rustic, G., Wang, S., Liu, H., Krakauer, N. Y., Wang, W., Desai, A. R., Montagnani, L., Tha Paw U, K., Falk, M., Black, A., Bernhofer, C., Grünwald, T., Laurila, T., Cescatti, A., Moors, E., Bracho, R., Valentini, R.

Several lines of evidence suggest that the warming climate plays a vital role in driving certain types of extreme weather. The impact of warming and of extreme weather on forest carbon assimilation capacity is poorly known. Filling this knowledge gap is critical towards understanding …


Journal: Environmental Research Letters, Volume 9 (6): 065002-n/a (2014), ISBN . DOI: 10.1088/1748-9326/9/6/065002 Sites: BR-Ma2

Contrasting Effects Of Invasive Insects And Fire On Ecosystem Water Use Efficiency
Clark, K. L., Skowronski, N. S., Gallagher, M. R., Renninger, H., Schäfer, K. V. R.

We used eddy covariance and meteorological measurements to estimate net ecosystem exchange of CO2 (NEE), gross ecosystem production (GEP), evapotranspiration (Et), and ecosystem water use efficiency (WUEe; calculated as GEP / Et during dry canopy conditions) in three upland forests …


Journal: Biogeosciences, Volume 11 (23): 6509-6523 (2014), ISBN . DOI: 10.5194/bg-11-6509-2014 Sites: US-Slt

Modeling Respiration From Snags And Coarse Woody Debris Before And After An Invasive Gypsy Moth Disturbance
Renninger, H. J., Carlo, N., Clark, K. L., Schäfer, K. V.

Although snags and coarse woody debris are a small component of ecosystem respiration, disturbances can significantly increase the mass and respiration from these carbon (C) pools. The objectives of this study were to (1) measure respiration rates of snags and coarse woody debris throughout the year in a forest previously defoliated …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (4): 630-644 (2014), ISBN . DOI: 10.1002/2013jg002542 Sites: US-Slt

The Spatial Scale Dependence Of Water Vapor Variability Inferred From Observations From A Very Tall Tower
Pressel, K. G., Collins, W. D., Desai, A. R.

Recent studies have established that atmospheric water vapor fields exhibit spatial spectra that take the form of power laws and hence can be compactly characterized by scaling exponents. The power law scaling exponents have been shown to exhibit substantial vertical variability. In this work, Taylor’s frozen turbulence hypothesis …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 119 (16): 9822-9837 (2014), ISBN . DOI: 10.1002/2013JD021141 Sites: US-PFa

CO2, CO, And CH4 Measurements From Tall Towers In The NOAA Earth System Research Laboratory's Global Greenhouse Gas Reference Network: Instrumentation, Uncertainty Analysis, And Recommendations For Future High-Accuracy Greenhouse Gas Monitoring Efforts
Andrews, A.E., Kofler, J.D., Trudeau, M.E., Williams, J.C., Neff, D.H., Masarie, K.A., Chao, D.Y., Kitzis, D.R., Novelli, P.C., Zhao, C.L., Dlugokencky, E.J., Lang, P.M., Crotwell, M.J., Fischer, M.L., Parker, M.J., Lee, J.T., Baumann, D.D., Desai, A.R., Stanier, C.O., de Wekker, S.F.J., Wolfe, D.E., Munger, J.W., Tans, P.P.

A reliable and precise in situ CO2 and CO analysis system has been developed and deployed at eight sites in the NOAA Earth System Research Laboratory’s (ESRL) Global Greenhouse Gas Reference Network. The network uses very tall (> 300 m) television and radio transmitter towers that provide a convenient platform for mid-boundary-layer …


Journal: Atmospheric Measurement Techniques, Volume 7 (2): 647-687 (2014), ISBN . DOI: 10.5194/amt-7-647-2014 Sites: US-PFa

Parsing The Variability In Ch4 flux At A Spatially Heterogeneous Wetland: Integrating Multiple Eddy Covariance Towers With High-Resolution Flux Footprint Analysis
Matthes, J. H., Sturtevant, C., Verfaillie, J., Knox, S., Baldocchi, D.

Restored wetlands are a complex mosaic of open water and new and old emergent vegetation
patches, where multiple environmental and biological drivers contribute to the measured heterogeneity in
methane (CH4) flux. In this analysis, we replicated the measurements of CH4 flux using the eddy covariance
technique at three tower locations …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (7): 1322-1339 (2014), ISBN . DOI: 10.1002/2014JG002642 Sites: US-Myb

Carbon Dioxide Fluxes Of An Urban Tidal Marsh In The Hudson-Raritan Estuary
Schäfer, K. V., Tripathee, R., Artigas, F., Morin, T. H., Bohrer, G.

Net ecosystem exchange (NEE) of tidal brackish wetlands in urban areas is largely unknown, albeit it is an important ecosystem service. High carbon dioxide (CO2) uptake of estuaries can potentially be achieved by creating conditions that foster CO2 uptake and sequestration. Thus, this study sought to assess NEE in a mesohaline tidal …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (11): 2065-2081 (2014), ISBN . DOI: 10.1002/2014JG002703 Sites: US-HPY, US-MRM, US-SHS

Spatial Scale And Landscape Heterogeneity Effects On Fapar In An Open-Canopy Black Spruce Forest In Interior Alaska
Kobayashi, H., Suzuki, R., Nagai, S., Nakai, T., Kim, Y.

Black spruce forests dominate the land cover in interior Alaska. In this region, satellite remote sensing of ecosys- tem productivity is useful for evaluating black spruce for- est status and recovery processes. The fraction of absorbed photosynthetically active radiation (FAPAR) by green leaves is a particularly important input …


Journal: Ieee Geoscience And Remote Sensing Letters, Volume 11 (2): 564-568 (2014), ISBN . DOI: 10.1109/LGRS.2013.2278426 Sites: US-Prr

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