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LATEST SEMINARS |
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Spring Lecture 2006
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Spring Lecture Blockseminar March 27 - March 31:
Prof. Stuart A. Penkett, School of Environmental
Sciences, University of East Anglia:
"Measurements of tropospheric and stratospheric trace gases with respect to atmospheric oxidation mechanisms".
Lecture materials and viewgraphs for lectures 1-3 can be downloaded here.
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27 March
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13:15-15:00, room S3120
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Lecture 1. Basic Tropospheric Photochemistry: Production of HOx Radicals and Peroxides from the photolysis of Ozone in the presence of large concentrations of water vapour
Abstract. This lecture will describe how hydroxyl radicals dominate the chemistry of the troposphere including their production from ozone photolysis, and their reaction with major atmospheric trace gases (such as carbon monoxide), leading to production of peroxy radicals and peroxides. The lecture will give examples of the presence of this chemistry from field measurements carried out at the surface in the remote marine atmosphere and from measurements by research aircraft between the surface and the tropopause. The lecture will also show how the trace gas composition of the lower atmosphere is controlled by hydroxyl radical chemistry leading to the in-situ production and loss of tropospheric ozone which is dealt with in Lecture 2.
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29 March
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13:15-15:00, room S3120
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Lecture 2. The Tropospheric Ozone Budget
Abstract. This lecture will discuss the production and loss of ozone in the troposphere by photochemical cycles involving nitrogen oxides, carbon monoxide and hydrocarbons. It will discuss how the Leighton Relationship describing the photochemical equilibrium between the oxides of nitrogen (NO and NO2) and ozone can be perturbed by peroxy radicals to produce the large amounts of ozone which are necessary to balance ozone loss by photolysis and free radical chemistry. It will give examples from both regional and global measurements showing the dominance of tropospheric over stratospheric chemistry in controlling the tropospheric ozone budget. Many examples will be given of the importance of long-range transport of pollutants from the continents in controlling global ozone production and loss in the remote atmosphere. The experimental evidence comes from both European and North American research aircraft measurements and from commercial aircraft projects such as CARIBIC and MOZAIC which are entirely European.
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31 March
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13:15-15:00, room S3120
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Lecture 3. Some Current Research Problems in Tropospheric Chemistry
Abstract. This lecture will discuss various aspects of current research into tropospheric chemistry on regional and global scales. It will start by considering ozone trends in Europe which have shown a reduction in ozone maxima experienced in summer photochemical episodes whilst simultaneously showing an increase in background ozone concentrations measured in springtime. Ozone concentrations experienced at the surface are likely to undergo major changes over the next decade due to both long-range transport of ozone and its precursors from areas where emissions of pollutants are on the increase (e.g. southeast Asia), and to increasing daytime temperatures due to climate change. This latter will substantially increase emissions of isoprene from vegetation causing summer episodic maximum ozone concentrations (which up till now have been on the decline) to increase again. The lecture will also show examples of the increasing emissions of gases (particularly nitrogen oxides) from coastal shipping and will conclude with a discussion of the enhanced relevance of nitrate radical chemistry in controlling the oxidising capacity of the regional and possibly the global atmosphere. Extensive illustrations will be used from current satellite measurements.
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Spring Lecture 2004
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Spring Lecture 2004 : Howard Roscoe from British Antarctic Survey and Ted Llewllyn from University of Saskatchewan / Institute
of Space and Atmospheric Studies
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01 March
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16:15, Howard Roscoe: "The Brewer-Dobson circulation - forcing, control, and relevance"
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03 March
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16:15, Talk by Howard Roscoe : "The Brewer-Dobson circulation - is there a trend, and does it explain the large increase in stratospheric water vapour?"
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05 March
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15:15, Talk by Howard Roscoe : "NO2 measurements past and present"
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08 March
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16:15, Talk by Ted Llewllyn : "An Introduction to Molecular spectra and the determination of temperature"
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10 March
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16:15, Talk by Ted Llewllyn: "An estimate of the radiative lifetime of an excited molecular state and selection rules"
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12 March
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15:15, Talk by Ted Llewllyn: "An introduction to the mesosphere using satellite measurements of the airglow"
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15 March
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16:15, Talk by Ted Llewllyn: "An introduction to the problem of atmospheric tomography"
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Lectures + Seminars
