Results 21 to 30 of about 49,964 (180)

Implementation of the MEGAN (v2.1) biogenic emission model in the ECHAM6-HAMMOZ chemistry climate model [PDF]

Geoscientific Model Development, 2017
A biogenic emission scheme based on the Model of Emissions of Gases and Aerosols from Nature (MEGAN) version 2.1 (Guenther et al., 2012) has been integrated into the ECHAM6-HAMMOZ chemistry climate model in order to calculate the emissions from ...
A.-J. Henrot, T. Stanelle, S. Schröder, C. Siegenthaler, D. Taraborrelli, M. G. Schultz   +5 more
doaj   +1 more source

Importance of isomerization reactions for OH radical regeneration from the photo-oxidation of isoprene investigated in the atmospheric simulation chamber SAPHIR [PDF]

Atmospheric Chemistry and Physics, 2020
Theoretical, laboratory, and chamber studies have shown fast regeneration of the hydroxyl radical (OH) in the photochemistry of isoprene, largely due to unimolecular reactions which were previously thought not to be important under atmospheric conditions.
A. Novelli, L. Vereecken, B. Bohn, H.-P. Dorn, G. I. Gkatzelis, G. I. Gkatzelis, G. I. Gkatzelis, A. Hofzumahaus, F. Holland, D. Reimer, F. Rohrer, S. Rosanka, D. Taraborrelli, R. Tillmann, R. Wegener, Z. Yu, Z. Yu, A. Kiendler-Scharr, A. Wahner, H. Fuchs   +19 more
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Diagnosing the stratosphere-to-troposphere flux of ozone in a chemistry transport model [PDF]

, 2005
[1] Events involving stratosphere-troposphere exchange (STE) of ozone, such as tropopause folds and westerly ducts, are readily identified in observations and models, but a quantitative flux specifying where and when stratospheric ozone is mixed into the
Hsu, Juno, Prather, M J, Wild, O
core   +5 more sources

A new plant chamber facility, PLUS, coupled to the atmosphere simulation chamber SAPHIR [PDF]

Atmospheric Measurement Techniques, 2016
A new PLant chamber Unit for Simulation (PLUS) for use with the atmosphere simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) has been built and characterized at the Forschungszentrum Jülich GmbH, Germany ...
T. Hohaus, U. Kuhn, S. Andres, M. Kaminski, F. Rohrer, R. Tillmann, A. Wahner, R. Wegener, Z. Yu, A. Kiendler-Scharr   +9 more
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Secondary organic aerosol formation from hydroxyl radical oxidation and ozonolysis of monoterpenes [PDF]

Atmospheric Chemistry and Physics, 2015
Oxidation by hydroxyl radical (OH) and ozonolysis are the two major pathways of daytime biogenic volatile organic compound (BVOC) oxidation and secondary organic aerosol (SOA) formation.
D. F. Zhao, M. Kaminski, P. Schlag, H. Fuchs, I.-H. Acir, B. Bohn, R. Häseler, A. Kiendler-Scharr, F. Rohrer, R. Tillmann, M. J. Wang, R. Wegener, J. Wildt, A. Wahner, Th. F. Mentel   +14 more
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Investigation of potential interferences in the detection of atmospheric RO_x radicals by laser-induced fluorescence under dark conditions [PDF]

Atmospheric Measurement Techniques, 2016
Direct detection of highly reactive, atmospheric hydroxyl radicals (OH) is widely accomplished by laser-induced fluorescence (LIF) instruments. The technique is also suitable for the indirect measurement of HO2 and RO2 peroxy radicals by chemical ...
H. Fuchs, Z. Tan, A. Hofzumahaus, S. Broch, H.-P. Dorn, F. Holland, C. Künstler, S. Gomm, F. Rohrer, S. Schrade, R. Tillmann, A. Wahner   +11 more
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OH regeneration from methacrolein oxidation investigated in the atmosphere simulation chamber SAPHIR [PDF]

Atmospheric Chemistry and Physics, 2014
Hydroxyl radicals (OH) are the most important reagent for the oxidation of trace gases in the atmosphere. OH concentrations measured during recent field campaigns in isoprene-rich environments were unexpectedly large.
H. Fuchs, I.-H. Acir, B. Bohn, T. Brauers, H.-P. Dorn, R. Häseler, A. Hofzumahaus, F. Holland, M. Kaminski, X. Li, K. Lu, A. Lutz, S. Nehr, F. Rohrer, R. Tillmann, R. Wegener, A. Wahner   +16 more
doaj   +1 more source

Radiative forcing since preindustrial times due to ozone change in the troposphere and the lower stratosphere [PDF]

, 2006
Changes in atmospheric ozone have occurred since the preindustrial era as a result of increasing anthropogenic emissions. Within ACCENT, a European Network of Excellence, ozone changes between 1850 and 2000 are assessed for the troposphere and the lower ...
Isaksen, I S A, Mickley, L J, Prather, M J, Shine, K P, Sanderson, M G, Zeng, G, Sudo, K, Hauglustaine, D A, Mancini, E, Collins, W J, Lamarque, J F, Pyle, J A, Grewe, V, Ellingsen, K, Dentener, F J, Gohar, L K, Stevenson, D S, Iachetti, D, Wild, O, Pitari, G, Szopa, S, Myhre, G, Gauss, M   +22 more
core   +7 more sources

Measurements of hydroperoxy radicals (HO₂) at atmospheric concentrations using bromide chemical ionisation mass spectrometry [PDF]

Atmospheric Measurement Techniques, 2019
Hydroxyl and hydroperoxy radicals are key species for the understanding of atmospheric oxidation processes. Their measurement is challenging due to their high reactivity; therefore, very sensitive detection methods are needed.
S. R. Albrecht, A. Novelli, A. Hofzumahaus, S. Kang, Y. Baker, T. Mentel, A. Wahner, H. Fuchs   +7 more
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Disquisitions Relating to Principles of Thermodynamic Equilibrium in Climate Modelling

Entropy, 2022
We revisit the fundamental principles of thermodynamic equilibrium in relation to heat transfer processes within the Earth’s atmosphere. A knowledge of equilibrium states at ambient temperatures (T) and pressures (p) and deviations for these p-T states ...
Leslie V. Woodcock
doaj   +1 more source