Mark J. Potosnak

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The emission of isoprene from the leaves of forest trees is a fundamental component of biosphere-atmosphere interactions, controlling many aspects of photochemistry in the lower atmosphere. As almost all commercial agriforest species emit high levels of isoprene, proliferation of agriforest plantations has significant potential to increase regional ozone(More)
The global emissions of isoprene are calculated at 0.5 • resolution for each year between 1995 and 2006, based on the MEGAN (Model of Emissions of Gases and Aerosols from Nature) version 2 model (Guenther et al., 2006) and a detailed multi-layer canopy environment model for the calculation of leaf temperature and visible radiation fluxes. The calculation is(More)
Hourly data for concentrations and fluxes of CO2 at 30 m in Harvard Forest (Petersham, Massachusetts) are analyzed using linear modeling to obtain regionally representative CO2 concentrations at a continental site. The time series is decomposed into contributions due to regional combustion, local canopy exchange, monthly average regional biotic exchange (as(More)
Hourly data for concentrations and uxes of CO 2 at 30 m in Harvard Forest Petersham, Massachusetts are analyzed using linear modeling to obtain regionally representative C O 2 concentrations at a continental site. The time series is decomposed into contributions due to regional combustion, local canopy exchange, monthly average regional biotic exchange as(More)
T he importance of land surface properties in controlling the exchanges of energy, water, and momentum with the atmosphere, and thus in infl u-encing local and regional climate, is well recognized. Important land surface characteristics—including albedo, surface roughness, latent and sensible heat fl uxes, and rates of evapotranspiration—aff ect the way in(More)
Tropical forests are an important global source of volatile organic compounds (VOCs) and other atmospheric trace gases. The high biodiversity in tropical rainforests complicates the extrapolation of biogenic volatile organic compound (BVOC) emissions from leaf-level measurements to landscape and regional or global scales. In Amazônia, a 5 significant(More)
This manuscript includes findings from field and numerical modeling investigations designed to quantify the degree and rates of biogenic hydrocarbon chemical processing within and above a mixed deciduous forest in the southeastern United States. The study site was under the influences of nitrogen oxide and hydrocarbon emissions from suburban automobile(More)
Continuous time-series estimates of net ecosystem carbon exchange (NEE) are routinely made using eddy covariance techniques. Identifying and compensating for errors in the NEE time series can be automated using a signal processing filter like the ensemble Kalman filter (EnKF). The EnKF compares each measurement in the time series to a model prediction and(More)
Analytical and Computational Thinking Working Group recommended the development of a new designation within Scientific Inquiry: Science as a Way of Knowing. This recommendation was approved by the Provost through a Memorandum of Understanding. The Liberal Studies Council then formed an ad‐hoc working group to craft new learning outcomes for SWK, and(More)
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