HR: 08:20h
AN: A31E-02 [Abstracts]
TI: Measurements of Peroxy Radicals in Air Masses Undergoing Long Range Transport During ITOP
AU: * Parker, A E
EM: aep20@le.ac.uk
AF: University of Leicester, Department of Chemistry
University Road, Leicester, LE1 7RH
United Kingdom
AU: Monks, P S
EM: psm7@le.ac.uk
AF: University of Leicester, Department of Chemistry
University Road, Leicester, LE1 7RH
United Kingdom
AU: Jacob, M J
EM: mjj3@le.ac.uk
AF: University of Leicester, Department of Chemistry
University Road, Leicester, LE1 7RH
United Kingdom
AU: Green, T J
EM: copper_top_tim@yahoo.com
AF: University of East Anglia, School of Environmental Sciences
, Norwich, NR4 7TJ
United Kingdom
AU: Penkett, S A
EM: M.Penkett@uea.ac.uk
AF: University of East Anglia, School of Environmental Sciences
, Norwich, NR4 7TJ
United Kingdom
AU: Methven, J
EM: J.Methven@reading.ac.uk
AF: University of Reading, Department of Meteorology
Earley Gate
PO Box 243, Reading, RG6 6BB
United Kingdom
AB:
The sum of organic peroxy radicals (σRiO2) and HO2 was measured with a dual-channel PEroxy
Radical Chemical Amplifier (PERCA) deployed on an aircraft platform (the NERC/UKMO BAe 146-300) during the Intercontinental
Transport of Ozone and Precursors (ITOP) campaign held in July/August 2004 based out of Faial, Azores. Peroxy radicals are
key intermediates and chain carriers in the gas phase oxidation of volatile organic compounds, and owing to their short
lifetime give an indication of in-situ photochemical ozone production.
Enhanced levels of peroxy radicals were observed within polluted air masses undergoing long-range transport during ITOP and
this work focuses on the importance of in-situ photochemical production and long-range transport in determining the
composition of the troposphere remote from the source region. The measurements of peroxy radicals and analyses of their role
within photochemically active air masses undergoing transport shall be presented. In particular, an assessment of the
photochemical activity of a range of air masses undergoing LRT with different source signatures will be presented.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005