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). 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). DOI: 10.1002/2014JG002642 Sites: US-Myb
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). DOI: 10.1002/2014JG002703 Sites: US-HPY, US-MRM, US-SHS
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). DOI: 10.1109/LGRS.2013.2278426 Sites: US-Prr
Journal: Global Biogeochemical Cycles, Volume 28 (4): 352-370 (2014). DOI: 10.1002/2013GB004686 Sites: US-NR1
Journal: Global Change Biology, Volume 20 (4): 1161-1173 (2014). DOI: doi:10.1111/gcb.12434 Sites: US-Uaf
Journal: J. Forest Res., Volume 20: 52-59 (2014). DOI: Sites: US-Prr, US-Uaf
Quantifying impacts of ecological disturbance on ecosystem carbon and water fluxes will improve predictive understanding of biosphere—atmosphere feedbacks. Tree mortality caused by mountain pine bark beetles (Dendroctonus ponderosae) is hypothesized to decrease photosynthesis and water flux to the atmosphere while increasing respiration …
Journal: Environmental Research Letters, Volume 9 (10): 105004 (2014). DOI: 10.1088/1748-9326/9/10/105004 Sites: US-CPk
Journal: Atmospheric Environment, Volume 84: 314-322 (2014). DOI: 10.1016/j.atmosenv.2013.11.055 Sites: US-MOz
We investigated relationships between tree-ring δ13C and growth, and flux tower estimates of gross primary productivity (GPP) at Harvard Forest from 1992 to 2010. Seasonal variations of derived photosynthetic isotope discrimination (Δ13C) and leaf intercellular CO2 concentration (c i ) showed significant increasing trends for the …
Journal: Environmental Research Letters, Volume 9 (7): 074011 (2014). DOI: 10.1088/1748-9326/9/7/074011 Sites: US-Ha1