|From||Matthew Rigby <Matt.Rigby@bristol.ac.uk>|
|Date||Wed, 25 Jan 2012 11:15:29 +0000|
Quantifying sources and sinks of the atmosphere's fastest-growing greenhouse gasses There are more than 40 greenhouse gases present in significant quantities in the atmosphere, many of which are much more fast-growing than CO2. One family of gasses of particular concern are the hydrofluorocarbons (HFCs), which are widely-used replacements for ozone-destroying CFCs. Per tonne of emissions, these gasses are tens to thousands of times more potent than CO2 and some are increasing in concentration by tens of percent per year. They are predominantly removed from the atmosphere by a naturally-occuring compound, the hydroxyl radical (OH), which is often called the 'detergent' of the atmosphere. During this 3-year project, the student will develop methods to infer detailed HFC source estimates using atmospheric measurements and chemical transport models. They will develop new multi-species estimation techniques, in which correlations between HFC source distributions are exploited to decrease the overall uncertainty on HFC emissions. Factors that lead to variability in the global OH concentration will be investigated using a chemical transport model, and the influence of these changes on HFC concentrations and top-down emissions estimates will be examined. Outcomes will include the most detailed and comprehensive set of 'top-down' global HFC emissions estimates yet compiled, and an increased understanding of the influence of variability in global hydroxyl radical concentration on the atmospheric HFC burden. These aims will be achieved through collaboration with the UK Met. Office and international partners such as the Massachusetts Institute of Technology (MIT) through the Advanced Global Atmospheric Gases Experiment (AGAGE). You will be based in the Atmospheric Chemistry Research Group (ACRG, http://www.bris.ac.uk/chemistry/research/acrg) in the School of Chemistry at the University of Bristol. ACRG is a fast-growing and friendly research group with a wide range of expertise in the measurement and modelling of atmospheric composition. Applicants must have, or expect to obtain, a 2:1 or above in a relevant discipline. An excellent background in mathematics is required, and some coding experience is preferable. The NERC funding source, which covers tuition fees and a stipend, requires that the applicant be a UK resident (http://www.nerc.ac.uk/funding/application/studentships/). Non-UK residents are welcome to apply, if they can obtain their own funding. Supervisors: Matt Rigby (web.mit.edu/mrigby) and Simon O'Doherty (http://www.bris.ac.uk/chemistry/research/acrg/people/odoherty.html). Applications and enquires should be sent to email@example.com. -------------------------------------------------- Matt Rigby NERC Advanced Research Fellow School of Chemistry University of Bristol BS8 1TS UK web.mit.edu/mrigby
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