|From||"Halloran, Paul" <P.Halloran@exeter.ac.uk>|
|Date||Mon, 10 Nov 2014 13:22:07 +0000|
PhD studentship: The smell of pre-industrial seas: Using marine aerosol emissions to understand a present day climate change. University of Exeter. Further details: http://www.exeter.ac.uk/studying/funding/award/?id=1548 Supervisors: Paul Halloran (Exeter University) email@example.com Tom Bell (Plymouth Marine Labs) Ben Booth (Met Office) How atmospheric particles (aerosols) interact with clouds is perhaps the biggest open challenge we face in understanding the human impact on our climate. Aerosols act as seeds for cloud-droplet formation, increasing the brightness and lifetime of clouds, reflecting light and cooling the planet. Many of these particles form from sulfur-dioxide (SO2). Prior to the industrial revolution the dominant source of SO2 was dimethylsulfide (DMS) produced by marine algae. It has been hypothesised that as these algae respond to global warming, they may increase their DMS production, slowing down the warming – a negative feedback central to the Gaia hypothesis. Since industrialisation, SO2 has been released from fossil fuel burning. The amount of background natural aerosol (from DMS) controls the degree to which industrial SO2 impactes cloud reflectivity. Adding more seeds to an atmosphere already heavily loaded with natural cloud-droplet seeds makes very little difference, but added to a very clean atmosphere has a huge effect. Currently, the proportion of natural versus industrial cloud-seeds is unknown. This studentship will address this problem. We seek an enthusiastic, numerate student, prepared to spend an extended period at sea. You must have achieved at least a 2:1 BSc Honours in a physical science (environmental science, chemistry, physics, maths etc.) and be capable of independent and team work. UK and International applicants are invited to apply. Please contact any of the supervisors with question or for further details. Many thanks, Paul Halloran
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