Objective
The aim of this project is to obtain a quantitative understanding of the products, mechanisms and kinetics of reactions associated with the low temperature polar stratospheric cloud(PSC) surface chemistry of various chlorine and bromine species, nitrogen oxide compounds and ozone. This information is required to clarify aspects of heterogeneous and homogeneous stratospheric chemistry, which have been shown to be important in determining observed annual depletion in ozone levels over Antarctica.
It is now widely believed that much of the heterogeneous chemistry which accounts for the conversion of reservoir chlorine oxide to reactive chlorine oxide species and also reactive nitrogen oxide to reservoir nitrogen oxide species occurs within polar stratospheric clouds (PSC). The low temperature particles implicated in these chemical transformations are of 2 main types: formed at around 195 K consisting of nitric acid trihydrate (NAT) with diameters 0.2 to 0.5 um; and formed at temperatures <188 K consisting of a NAT nucleus but surrounded by water and ice to give overall diameters 10 to 20 um. If it is accepted that the observed chemistry is solely associated with the surface grain boundaries of such particles, then the use of an extended 2 dimensional surface several mm{2} in total area will represent a suitable mimic for laboratory studies of PSC behaviour.
The specific research objectives are as follows.
Characterization of nitric acid ice and water ice PSC mimics using Fourier transform infrared(FTIR) and laser induced fluorescence(LIF) to determine related absorption cross sections in the ultraviolet(UV).
Determination of PSC surface reaction products and mechanisms using FTIR, LIF, mass spectrometry(MS) and resonance enhanced multiphoton ionization(REMPI).
Determination of sticking coefficients for chlorine oxide, bromine oxide and nitrogen oxide on ice surfaces at different temperatures using FTIR and MS.
Determination of gas phase products of bromine oxide chemistry and laser photochemistry using cryogenic techniques and FTIR.
Determination of the effect of photolysis on PSC mimics. This will serve as a useful preliminary to a study of PSC photochemical surface reactions.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- agricultural sciences agriculture, forestry, and fisheries agriculture grains and oilseeds
- natural sciences chemical sciences physical chemistry photochemistry
- natural sciences chemical sciences inorganic chemistry halogens
- natural sciences chemical sciences analytical chemistry mass spectrometry
- natural sciences physical sciences optics laser physics
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
NR4 7TJ NORWICH
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.