The lack of energy closure has been a longstanding issue with Eddy Covariance (EC). Multiple mechanisms have been proposed to explain the discrepancies in energy balance including diurnal energy storage changes, advection of energy, and larger scale turbulent processes that cannot be resolved by field EC. To investigate the energy …
Journal: Agricultural And Forest Meteorology, Volume 184: 204-209 (2014), ISBN . DOI: 10.1016/j.agrformet.2013.09.012 Sites: US-SuS, US-SuW
Disturbances are increasing globally due to anthropogenic changes in land use and climate. This study determines whether a disturbance that affects the physiology of individual trees can be used to predict …
Journal: Journal Of Geophysical Research: Biogeosciences, Volume 119 (6): 1195-1215 (2014), ISBN . DOI: 10.1002/2013jg002597 Sites: US-GLE
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
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
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
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
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
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
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
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