Results 11 to 20 of about 11,807 (143)

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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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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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
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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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Effects of NO_x and SO₂ on the secondary organic aerosol formation from photooxidation of α-pinene and limonene [PDF]

Atmospheric Chemistry and Physics, 2018
Anthropogenic emissions such as NOx and SO2 influence the biogenic secondary organic aerosol (SOA) formation, but detailed mechanisms and effects are still elusive.
D. Zhao, S. H. Schmitt, M. Wang, M. Wang, I.-H. Acir, I.-H. Acir, R. Tillmann, Z. Tan, Z. Tan, A. Novelli, H. Fuchs, I. Pullinen, I. Pullinen, R. Wegener, F. Rohrer, J. Wildt, A. Kiendler-Scharr, A. Wahner, T. F. Mentel   +18 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
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Identification of high-wind features within extratropical cyclones using a probabilistic random forest – Part 2: Climatology over Europe [PDF]

Weather and Climate Dynamics, 2023
Strong winds associated with extratropical cyclones are one of the most dangerous natural hazards in Europe. These high winds are mostly associated with five mesoscale features: the warm (conveyor belt) jet (WJ); the cold (conveyor belt) jet (CJ); cold ...
L. Eisenstein, B. Schulz, J. G. Pinto, P. Knippertz   +3 more
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Effects of stratosphere‐troposphere chemistry coupling on tropospheric ozone [PDF]

Journal of Geophysical Research: Atmospheres, 2010
A new, computationally efficient coupled stratosphere‐troposphere chemistry‐climate model (S/T‐CCM) has been developed based on three well‐documented components: a 64‐level general circulation model from the UK Met Office Unified Model, the tropospheric chemistry transport model (STOCHEM), and the UMSLIMCAT stratospheric chemistry module.
Tian, Wenshou, Chipperfield, Martyn P., Stevenson, David S., Damoah, Richard, Dhomse, Sandip, Dudhia, Anu, Pumphrey, Hugh, Bernath, Peter   +7 more
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Generation of Meteorological Parameters for Tropospheric Delay on GNSS Signal [PDF]

Journal of Astronomy and Space Sciences, 2008
The GNSS (Global Navigation Satellite System) signal is delayed by the neutral atmosphere at the troposphere, so that the delay is one of major error sources for GNSS precise positioning. The tropospheric delay is an integrated refractive index along the
Sung-Wook Jung, Jeongho Baek, Jung Hyun Jo, Jaewon Lee, In-Kwan Park, Sungki Cho, Jong-Uk Park   +6 more
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Investigation of the limonene photooxidation by OH at different NO concentrations in the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) [PDF]

Atmospheric Chemistry and Physics, 2022
The oxidation of limonene by the hydroxyl (OH) radical and ozone (O3) was investigated in the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) in experiments performed at different nitric oxide (
J. Y. S. Pang, A. Novelli, M. Kaminski, M. Kaminski, I.-H. Acir, I.-H. Acir, B. Bohn, P. T. M. Carlsson, C. Cho, C. Cho, H.-P. Dorn, A. Hofzumahaus, X. Li, X. Li, A. Lutz, S. Nehr, S. Nehr, D. Reimer, F. Rohrer, R. Tillmann, R. Wegener, A. Kiendler-Scharr, A. Kiendler-Scharr, A. Wahner, H. Fuchs, H. Fuchs   +25 more
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