Zobrazeno 1 - 10
of 688
pro vyhledávání: '"P W, Seakins"'
Autor:
F. A. F. Winiberg, W. J. Warman, C. A. Brumby, G. Boustead, I. G. Bejan, T. H. Speak, D. E. Heard, D. Stone, P. W. Seakins
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 4375-4390 (2023)
Laser-induced fluorescence (LIF) spectroscopy has been widely applied to fieldwork measurements of OH radicals and HO2, following conversion to OH, over a wide variety of conditions, on different platforms and in simulation chambers. Conventional cal
Externí odkaz:
https://doaj.org/article/f2acba2eb41a4e98b296e4041b265914
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 2875-2887 (2022)
The chemistry and reaction kinetics of reactive species dominate changes to the composition of complex chemical systems, including Earth's atmosphere. Laboratory experiments to identify reactive species and their reaction products, and to monitor the
Externí odkaz:
https://doaj.org/article/21c28a00a8aa4a2f828e60450cc81737
Autor:
R. Woodward-Massey, E. J. Slater, J. Alen, T. Ingham, D. R. Cryer, L. M. Stimpson, C. Ye, P. W. Seakins, L. K. Whalley, D. E. Heard
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 3119-3146 (2020)
Hydroxyl (OH) and hydroperoxy (HO2) radicals are central to the understanding of atmospheric chemistry. Owing to their short lifetimes, these species are frequently used to test the accuracy of model predictions and their underlying chemical mechanis
Externí odkaz:
https://doaj.org/article/be5055a9620b4f61b768323d22bd0615
Autor:
L. Onel, A. Brennan, M. Gianella, J. Hooper, N. Ng, G. Hancock, L. Whalley, P. W. Seakins, G. A. D. Ritchie, D. E. Heard
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 2441-2456 (2020)
Simultaneous measurements of CH3O2 radical concentrations have been performed using two different methods in the Leeds HIRAC (Highly Instrumented Reactor for Atmospheric Chemistry) chamber at 295 K and in 80 mbar of a mixture of 3:1 He∕O2 and 1
Externí odkaz:
https://doaj.org/article/254158f9196a49b8929404ce3c9dea11
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 839-852 (2020)
OH and HO2 radicals are closely coupled in the atmospheric oxidation and combustion of volatile organic compounds (VOCs). Simultaneous measurement of HO2 yields and OH kinetics can provide the ability to assign site-specific rate coefficients that ar
Externí odkaz:
https://doaj.org/article/0e29dae119b54fb7b46a35eaffebb745
Autor:
D. R. Moon, G. S. Taverna, C. Anduix-Canto, T. Ingham, M. P. Chipperfield, P. W. Seakins, M.-T. Baeza-Romero, D. E. Heard
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 327-338 (2018)
One geoengineering mitigation strategy for global temperature rises resulting from the increased concentrations of greenhouse gases is to inject particles into the stratosphere to scatter solar radiation back to space, with TiO2 particles emerging
Externí odkaz:
https://doaj.org/article/5e01e9f087254cdc90e7fe31f47bc43b
Autor:
L. Onel, A. Brennan, M. Gianella, G. Ronnie, A. Lawry Aguila, G. Hancock, L. Whalley, P. W. Seakins, G. A. D. Ritchie, D. E. Heard
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 4877-4894 (2017)
The HO2 radical was monitored simultaneously using two independent techniques in the Leeds HIRAC (Highly Instrumented Reactor for Atmospheric Chemistry) atmospheric simulation chamber at room temperature and total pressures of 150 and 1000 mbar of
Externí odkaz:
https://doaj.org/article/3d772dfd63b14ebca8810347fce205ad
Autor:
H. Fuchs, A. Novelli, M. Rolletter, A. Hofzumahaus, E. Y. Pfannerstill, S. Kessel, A. Edtbauer, J. Williams, V. Michoud, S. Dusanter, N. Locoge, N. Zannoni, V. Gros, F. Truong, R. Sarda-Esteve, D. R. Cryer, C. A. Brumby, L. K. Whalley, D. Stone, P. W. Seakins, D. E. Heard, C. Schoemaecker, M. Blocquet, S. Coudert, S. Batut, C. Fittschen, A. B. Thames, W. H. Brune, C. Ernest, H. Harder, J. B. A. Muller, T. Elste, D. Kubistin, S. Andres, B. Bohn, T. Hohaus, F. Holland, X. Li, F. Rohrer, A. Kiendler-Scharr, R. Tillmann, R. Wegener, Z. Yu, Q. Zou, A. Wahner
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 4023-4053 (2017)
Hydroxyl (OH) radical reactivity (kOH) has been measured for 18 years with different measurement techniques. In order to compare the performances of instruments deployed in the field, two campaigns were conducted performing experiments in the atmo
Externí odkaz:
https://doaj.org/article/2cbe673f02f043128af2a2d6d671bba2
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 3985-4000 (2017)
A new method for measurement of the methyl peroxy (CH3O2) radical has been developed using the conversion of CH3O2 into CH3O by excess NO with subsequent detection of CH3O by fluorescence assay by gas expansion (FAGE) with laser excitation at ca.
Externí odkaz:
https://doaj.org/article/d4082fbd45ab41a98e2c7d7e4251f65d
Autor:
D. Stone, L. K. Whalley, T. Ingham, P. M. Edwards, D. R. Cryer, C. A. Brumby, P. W. Seakins, D. E. Heard
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 7, Pp 2827-2844 (2016)
OH reactivity (k′OH) is the total pseudo-first-order loss rate coefficient describing the removal of OH radicals to all sinks in the atmosphere, and is the inverse of the chemical lifetime of OH. Measurements of ambient OH reactivity can be used to
Externí odkaz:
https://doaj.org/article/a5f1d93d48d544f484d77aa70aa809fd