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Name
Atmospheric Chemistry and Physics (ACP)
Type
Journal
Items
7908 Publications
Compatibility
collected from a compatible aggregator
OAI-PMH
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  • The Nonequilbrium Thermodynamics of Atmospheric Blocking

    Jensen, Andrew (2016)
    Two strong NE Pacific blocking events that occurred nearly one year apart and in the same region are examined here by methods from nonequilbrium thermodynamics. In a nonequilibrium setting, the time variation of entropy is a sum of two parts: the external entropy supply and the internal entropy production. The internal entropy production and external entropy supply (the surface entropy supply) are calculated and compared to recent trends in the region that encompassed both blocking events. Th...

    Mass spectrometric measurement of hydrogen isotope fractionation for the reactions of chloromethane with OH and Cl

    Keppler, Frank; Bahlmann, Enno; Greule, Markus; Schöler, Heinz Friedrich; Wittmer, Julian; Zetzsch, Cornelius (2018)
    Chloromethane (CH3Cl) is an important provider of chlorine to the stratosphere but yet lacks detailed knowledge of its budget. Stable isotope analysis is potentially a powerful tool to constrain CH3Cl flux estimates. The largest degree of isotope fractionation is expected to occur for deuterium in CH3Cl in the hydrogen abstraction reactions with its main sink reactant tropospheric OH and its minor sink reactant Cl atoms. We determined the isotope fractionation by stable hydrogen isotope analy...

    Potential impact of carbonaceous aerosols on the Upper Troposphere and Lower Stratosphere (UTLS) during Asian summer monsoon in a global model simulation

    Fadnavis, Suvarna; Kalita, Gayatry; Kumar, K. Ravi; Gasparini, Blaz; Li, Jui-Lin Frank (2017)
    Recent satellite observations show efficient vertical transport of Asian pollutants from the surface to the upper level anticyclone by deep monsoon convection. In this paper, we examine the transport of carbonaceous aerosols including Black Carbon (BC) and Organic Carbon (OC) into the monsoon anticyclone using of ECHAM6-HAM, a global aerosol climate model. Further, we investigate impacts of enhanced (doubled) carbonaceous aerosols emissions on the UTLS from sensitivity simulations. Th...

    Particle Size Dependence of Biogenic Secondary Organic Aerosol Molecular Composition

    Tu, Peijun; Johnston, Murray V. (2017)
    Formation of secondary organic aerosol (SOA) is initiated by the oxidation of volatile organic compounds (VOCs) in the gas phase. Mass transfer to the particle phase is thought to occur primarily by a combination of condensation of non-volatile products and partitioning of semi-volatile products, though particle phase chemistry may also play a role if it transforms semi-volatile reactants into non-volatile products. In principle, changes in particle composition as a function of particle size...

    Methane emission from tropical savanna Trachypogon sp. grasses

    Sanhueza, E.; Donoso, L. (2006)
    Methane flux measurements from the soil-grass system were made during the wet season in unperturbed plots and plots where standing dry and green Trachypogon sp. grasses were clipped to just above the soil surface. Results support the surprising discovery that vegetation emits methane. The results of this work allows to infer that the savanna dry/green mixture of grasses produce methane at a rate of ~10 ng m−2 s−1, which is in agreement with early published soil-g...
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