Search results for: S. A. Penkett

Items from 1 to 14 out of 14 results

article

Comparison of Measured Ozone Production Efficiencies in the Marine Boundary Layer at Two European Coastal Sites under Different Pollution Regimes

A. R. Rickard, G. Salisbury, P. S. Monks, A. C. Lewis, more

Journal of Atmospheric Chemistry > 2002 > 43 > 2 > 107-134

Ozone production efficiencies (E_N), which can be defined as the netnumber of ozone molecules produced per molecule of NO_xoxidised, have been calculated from measurements taken during three intensive field campaigns (one in the spring, EASE 96, and two in the summer, EASE 97 and TIGER 95), at two European coastal sites (Mace Head, Ireland (EASE) and Weybourne, Norfolk (TIGER)) impacted by polluted...

article

A Seasonal Comparison of the Ozone Photochemistry in Clean and Polluted Air Masses at Mace Head, Ireland

G. Salisbury, P. S. Monks, S. Bauguitte, B. J. Bandy, more

Journal of Atmospheric Chemistry > 2002 > 41 > 2 > 163-187

Measurements of the sum of peroxy radicals [HO₂ + RO₂],NO_x (NO + NO₂) and NO_y (the sum of oxidisednitrogen species) made at Mace Head, on the Atlantic coast of Ireland in summer 1996 and spring 1997 are presented. Together with a suite of ancillary measurements, including the photolysis frequencies of O₃ → O(¹D)(j(O¹D)) and NO₂ (j(NO₂)), the measured peroxy radicals are used to calculate meandailyozone...

article

Intercomparison of Formaldehyde Measurements in Clean and Polluted Atmospheres

L. M. Cárdenas, D. J. Brassington, B. J. Allan, H. Coe, more

Journal of Atmospheric Chemistry > 2000 > 37 > 1 > 53-80

Three different techniques used tomeasure atmospheric formaldehyde were compared duringa field campaign carried out at a clean maritime siteon the West coast of Ireland. Two spectroscopictechniques Differential Optical AbsorptionSpectroscopy (DOAS) and Tunable Diode Laser AbsorptionSpectroscopy (TDLAS), together with a glass coil/Hantzschreaction/fluorescence technique, wereemployed for measurements...

article

The Role of In Situ Photochemistry in the Control of Ozone during Spring at the Jungfraujoch (3,580 m asl) – Comparison of Model Results with Measurements

P. Zanis, P. S. Monks, E. Schuepbach, S. A. Penkett

Journal of Atmospheric Chemistry > 2000 > 37 > 1 > 1-27

A photochemical box model has been used to model themeasured diurnal ozone cycle in spring at Jungfraujochin the Swiss Alps. The comparison of the modelleddiurnal ozone cycle with the mean measured diurnalozone cycle in spring, over the period 1988–1996,shows a good agreement both with regard to the shapeand amplitude. Ozone concentrations increase duringthe daytime and reach a maximum at about 16:00–17:00(GMT)...

article

The Weybourne Atmospheric Observatory

S. A. Penkett, J. M. C. Plane, F. J. Comes, K. C. Clemitshaw, more

Journal of Atmospheric Chemistry > 1999 > 33 > 2 > 107-110

article

Studies of Oxidant Production at the Weybourne Atmospheric Observatory in Summer and Winter Conditions

S. A. Penkett, K. C. Clemitshaw, N. H. Savage, R. A. Burgess, more

Journal of Atmospheric Chemistry > 1999 > 33 > 2 > 111-128

Detailed studies have been made of the behaviour of gases and radicals involved in the production of oxidants at the Weybourne Atmospheric Observatory in both summertime and wintertime conditions. In June 1995 the range of meteorological conditions experienced varied such that ozone destruction was observed in clean northerly air flows reaching Weybourne down the North Sea from the Arctic, and ozone...

article

Tropospheric Box-Modelling and Analytical Studies of the Hydroxyl (OH) Radical and Related Species: Comparison with Observations

J. L. Grenfell, N. H. Savage, R. M. Harrison, S. A. Penkett, more

Journal of Atmospheric Chemistry > 1999 > 33 > 2 > 183-214

Calculated and observed hydroxyl (OH) fields are presented. Calculated OH was obtained in three ways using (1) a photochemical box-model (2) a simple OH steady state approach and (3) a variant on (2) – the ‘multiple equation steady state’ approach which assumes steady state for OH, HO2 and RO2 and hence obtains three simultaneous, non linear, equations. All three methods used data collected in June...

article

Investigation and evaluation of the NO _x /O ₃ photochemical steady state

L. J. Carpenter, K. C. Clemitshaw, R. A. Burgess, S. A. Penkett, more

Atmospheric Environment > 1998 > 32 > 19 > 3353-3365

Measurements of O ₃ , NO, NO ₂ , the photodissociation rate coefficient of NO ₂ (j(NO ₂ )), and temperature made during the WAOWE'93 and '94 (Weybourne Atmospheric Observatory Winter Experiment) campaigns on the north Norfolk coast were used to evaluate the photochemical steady state (PSS) as a method of deriving peroxy radical (HO ₂ + RO ₂ ) concentrations...

article

Correlations between CO, NO _y , O ₃ and non-methane hydrocarbons and their relationships with meteorology during winter 1993 on the North Norfolk Coast, U.K.

L. M. Cárdenas, J. F. Austin, R. A. Burgess, K. C. Clemitshaw, more

Atmospheric Environment > 1998 > 32 > 19 > 3339-3351

Measurements of carbon monoxide and other pollutants were performed in a study of polluted air masses during winter at a time when atmospheric reactivity is low. Data collected during the Weybourne atmospheric observatory winter experiment in 1993 on the North Norfolk Coast, U.K. showed that CO is correlated with other atmospheric species and these correlations are influenced by both chemical and...

article

Reactive Nitrogen Compounds at Spitsbergen in the Norwegian Arctic

S. Solberg, T. Krognes, F. Stordal, Oø Hov, more

Journal of Atmospheric Chemistry > 1997 > 28 > 1-3 > 209-225

Simultaneousindependent measurements of NO_y and NO_x(NO_x= NO + NO₂) by high-sensitivitychemiluminescence systems and of PAN (peroxyacetylnitrate) and PPN (peroxypropionyl nitrate) by GC-ECDwere made at Spitsbergen in the Norwegian Arcticduring the first half year of 1994. The average mixingratio of the sum of PAN and PPN (denoted PANs)increased from around 150 pptv in early winter to amaximum of around...

article

Tropospheric Ozone Research (TOR) A Sub-Project of EUROTRAC

D. Kley, J. Beck, P. I. Grennfelt, Ø. Hov, more

Journal of Atmospheric Chemistry > 1997 > 28 > 1-3 > 1-9

article

Night-time peroxy radical chemistry in the remote marine boundary layer over the Southern Ocean

P. S. Monks, L. J. Carpenter, S. A. Penkett, G. P. Ayers

Oceanographic Literature Review > 1996 > 43 > 9 > 870

Peroxy radical measurements were made at Cape Grim, Tasmania during January and February 1995. From the experimental data it is clearly demonstrated that there is little night-time oxidation chemistry taking place: the sole type of peroxy radical that persists is CH ₃ O ₂ (τ > 12 hours) and the only nocturnal chemical process involving peroxy radicals appear to be the self-reaction...

article

The effects of wind speed and turbulence on the performance of diffusion tube samplers

A. J. Gair, S. A. Penkett

Atmospheric Environment > 1995 > 29 > 18 > 2529-2533

This paper describes and presents the results of a study to determine the effects of wind speed and turbulence on the performance of diffusion tube samplers, for measuring nitrogen dioxide in the outdoor environment. Samplers of varying length were exposed on the University of East Anglia roof in order to determine the relative reductions in the length of diffusion for the different sampler lengths...

article

Production of isoprene by marine phytoplankton cultures

R. M. Moore, D. E. Oram, S. A. Penkett

Oceanographic Literature Review > 1995 > 42 > 6 > 444-445

Measurements reported here of low molecular weight trace gases produced by a series of laboratory phytoplankton have shown that isoprene is a major component. Though the results confirm that the oceans are a potential source of isoprene to the atmosphere, it is not possible to extrapolate release rates from laboratory studies to the very different conditions under which marine plants grow naturally.

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