Search Results - "TURNIPSEED, A. A"

The influence of warm-season precipitation on the diel cycle of the surface energy balance and carbon dioxide at a Colorado subalpine forest site by Burns, S. P, Blanken, P. D, Turnipseed, A. A, Hu, J, Monson, R. K

“…Precipitation changes the physical and biological characteristics of an ecosystem. Using a precipitation-based conditional sampling technique and a 14 year…”
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Observations of gas- and aerosol-phase organic nitrates at BEACHON-RoMBAS 2011 by Fry, J. L, Draper, D. C, Zarzana, K. J, Campuzano-Jost, P, Day, D. A, Jimenez, J. L, Brown, S. S, Cohen, R. C, Kaser, L, Hansel, A, Cappellin, L, Karl, T, Hodzic Roux, A, Turnipseed, A, Cantrell, C, Lefer, B. L, Grossberg, N

“…At the Rocky Mountain Biogenic Aerosol Study (BEACHON-RoMBAS) field campaign in the Colorado front range, July–August 2011, measurements of gas- and…”
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Impacts of seasonal and regional variability in biogenic VOC emissions on surface ozone in the Pearl River delta region, China by Situ, S, Guenther, A, Wang, X, Jiang, X, Turnipseed, A, Wu, Z, Bai, J

“…This study investigated the impacts of seasonal and regional variability in biogenic volatile organic compounds (BVOCs) on surface ozone over the Pearl River…”
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Efficient Atmospheric Cleansing of Oxidized Organic Trace Gases by Vegetation by Karl, T, Harley, P, Emmons, L, Thornton, B, Guenther, A, Basu, C, Turnipseed, A, Jardine, K

“…The biosphere is the major source and sink of nonmethane volatile organic compounds (VOCs) in the atmosphere. Gas-phase chemical reactions initiate the removal…”
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Contribution of leaf and needle litter to whole ecosystem BVOC fluxes by Greenberg, J.P., Asensio, D., Turnipseed, A., Guenther, A.B., Karl, T., Gochis, D.

“…Biogenic volatile organic compound (BVOC) emissions come from a variety of sources, including living above-ground foliar biomass and microbial decomposition of…”
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Winter forest soil respiration controlled by climate and microbial community composition by Monson, R.K, Lipson, D.L, Burns, S.P, Turnipseed, A.A, Delany, A.C, Williams, M.W, Schmidt, S.K

“…Most terrestrial carbon sequestration at mid-latitudes in the Northern Hemisphere occurs in seasonal, montane forest ecosystems. Winter respiratory carbon…”
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Rapid formation of isoprene photo-oxidation products observed in Amazonia by Karl, T., Guenther, A., Turnipseed, A., Tyndall, G., Artaxo, P., Martin, S.

“…Isoprene represents the single most important reactive hydrocarbon for atmospheric chemistry in the tropical atmosphere. It plays a central role in global and…”
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Carbon sequestration in a high-elevation, subalpine forest by Monson, R. K., Turnipseed, A. A., Sparks, J. P., Harley, P. C., Scott-Denton, L. E., Sparks, K., Huxman, T. E.

“…We studied net ecosystem CO2 exchange (NEE) dynamics in a high‐elevation, subalpine forest in Colorado, USA, over a two‐year period. Annual carbon…”
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Folded tubular photometer for atmospheric measurements of NO2 and NO by Birks, John W, Andersen, Peter C, Williford, Craig J, Turnipseed, Andrew A, Strunk, Stanley E, Ennis, Christine A, Mattson, Erick

“…We describe and characterize a modular folded tubular photometer for making direct measurements of the concentrations of nitrogen dioxide (NO2) and specify how…”
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Portable calibrator for NO based on the photolysis of N2O and a combined NO2/NO/O3 source for field calibrations of air pollution monitors by Birks, John W, Turnipseed, Andrew A, Andersen, Peter C, Williford, Craig J, Strunk, Stanley, Carpenter, Brian, Ennis, Christine A

“…A highly portable calibration source of nitric oxide (NO) based on the photolysis of nitrous oxide (N2O) supplied by 8 or 16 g disposable cartridges is…”
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Temperature as a Control over Ecosystem CO₂ Fluxes in a High-Elevation, Subalpine Forest by Huxman, T. E., Turnipseed, A. A., J. P. Sparks, P. C. Harley, Monson, R. K.

“…We evaluated the hypothesis that CO₂ uptake by a subalpine, coniferous forest is limited by cool temperature during the growing season. Using the eddy…”
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Ethene, propene, butene and isoprene emissions from a ponderosa pine forest measured by relaxed eddy accumulation by Rhew, Robert C, Deventer, Malte Julian, Turnipseed, Andrew A, Warneke, Carsten, Ortega, John, Shen, Steve, Martinez, Luis, Koss, Abigail, Lerner, Brian M, Gilman, Jessica B, Smith, James N, Guenther, Alex B, de Gouw, Joost A

“…Alkenes are reactive hydrocarbons that influence local and regional atmospheric chemistry by playing important roles in the photochemical production of…”
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Undisturbed and disturbed above canopy ponderosa pine emissions: PTR-TOF-MS measurements and MEGAN 2.1 model results by Kaser, L, Karl, T, Guenther, A, Graus, M, Schnitzhofer, R, Turnipseed, A, Fischer, L, Harley, P, Madronich, M, Gochis, D, Keutsch, F. N, Hansel, A

“…We present the first eddy covariance flux measurements of volatile organic compounds (VOCs) using a proton-transfer-reaction time-of-flight mass spectrometer…”
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Eddy covariance fluxes of peroxyacetyl nitrates (PANs) and NOy to a coniferous forest by Turnipseed, A. A., Huey, L. G., Nemitz, E., Stickel, R., Higgs, J., Tanner, D. J., Slusher, D. L., Sparks, J. P., Flocke, F., Guenther, A.

“…We employed a fast response thermal dissociation‐chemical ionization mass spectrometer (TD‐CIMS) system to measure eddy covariance fluxes of peroxyacetyl…”
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Comparison of different real time VOC measurement techniques in a ponderosa pine forest by Kaser, L, Karl, T, Schnitzhofer, R, Graus, M, Herdlinger-Blatt, I. S, DiGangi, J. P, Sive, B, Turnipseed, A, Hornbrook, R. S, Zheng, W, Flocke, F. M, Guenther, A, Keutsch, F. N, Apel, E, Hansel, A

“…Volatile organic compound (VOC) mixing ratios measured by five independent instruments are compared at a forested site dominated by ponderosa pine (Pinus…”
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Use of a heated graphite scrubber as a means of reducing interferences in UV-absorbance measurements of atmospheric ozone by Turnipseed, Andrew A, Andersen, Peter C, Williford, Craig J, Ennis, Christine A, Birks, John W

“…A new solid-phase scrubber for use in conventional ozone (O3) photometers was investigated as a means of reducing interferences from other UV-absorbing species…”
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Missing peroxy radical sources within a summertime ponderosa pine forest by Wolfe, G. M, Cantrell, C, Kim, S, Mauldin III, R. L, Karl, T, Harley, P, Turnipseed, A, Zheng, W, Flocke, F, Apel, E. C, Hornbrook, R. S, Hall, S. R, Ullmann, K, Henry, S. B, DiGangi, J. P, Boyle, E. S, Kaser, L, Schnitzhofer, R, Hansel, A, Graus, M, Nakashima, Y, Kajii, Y, Guenther, A, Keutsch, F. N

“…Organic peroxy (RO2) and hydroperoxy (HO2) radicals are key intermediates in the photochemical processes that generate ozone, secondary organic aerosol and…”
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First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources by DiGangi, J. P., Boyle, E. S., Karl, T., Harley, P., Turnipseed, A., Kim, S., Cantrell, C., Maudlin III, R. L., Zheng, W., Flocke, F., Hall, S. R., Ullmann, K., Nakashima, Y., Paul, J. B., Wolfe, G. M., Desai, A. R., Kajii, Y., Guenther, A., Keutsch, F. N.

“…We report the first observations of formaldehyde (HCHO) flux measured via eddy covariance, as well as HCHO concentrations and gradients, as observed by the…”
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Portable ozone calibration source independent of changes in temperature, pressure and humidity for research and regulatory applications by Birks, John W, Williford, Craig J, Andersen, Peter C, Turnipseed, Andrew A, Strunk, Stanley, Ennis, Christine A

“…A highly portable ozone (O3) calibration source that can serve as a U.S. EPA level 4 transfer standard for the calibration of ozone analyzers is described and…”
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Observations of glyoxal and formaldehyde as metrics for the anthropogenic impact on rural photochemistry by DiGangi, J. P, Henry, S. B, Kammrath, A, Boyle, E. S, Kaser, L, Schnitzhofer, R, Graus, M, Turnipseed, A, Park, J-H, Weber, R. J, Hornbrook, R. S, Cantrell, C. A, Maudlin III, R. L, Kim, S, Nakashima, Y, Wolfe, G. M, Kajii, Y, Apel, E.C, Goldstein, A. H, Guenther, A, Karl, T, Hansel, A, Keutsch, F. N

“…We present simultaneous fast, in-situ measurements of formaldehyde and glyoxal from two rural campaigns, BEARPEX 2009 and BEACHON-ROCS, both located in Pinus…”
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