Details of Award

NERC Reference : NE/F01855X/1

Aerosols in London Experiment on Radiative Transfer (ALERT)

Principal Investigator:: Professor R Toumi, Imperial College London, Physics
Co-Investigator:: Dr H Brindley, Imperial College London, Physics
Grant held at:: Imperial College London, Physics

Abstract:: A substantial reduction in the amount of solar radiation reaching the Earth's surface, due to the presence of urban aerosol, has been reported for a variety of global locations. In the long-wave, the aerosol impact is more uncertain, however, a number of modeling and measurement studies suggest that the presence of urban aerosol can act to enhance downwelling fluxes to the surface significantly. Even more intriguingly, recent work has indicated that information contained in the spectrum of downwelling long-wave radiation at the surface can be employed to diagnose an aerosol effect on cloud microphysics: an indirect impact which would be expected to substantially modify both short-wave and long-wave cloudy-sky surface fluxes. Here, through ALERT, we propose to simultaneously measure, for the first time, the short-wave and long-wave urban aerosol radiative effect on the urban environment. Through a unique combination of observational and modeling tools, focused on central London, we will examine two principal hypotheses: Hypothesis 1: There is a measurable urban clear-sky long-wave and short-wave direct radiative effect at the surface due to aerosols. Hypothesis 2: There is an indirect aerosol radiative effect on urban short-wave and long-wave surface fluxes due to measurable shifts in cloud effective radius

Authorised funds only

This grant award has a total value of £379,425

DI - Other Costs	Exception - Equipment	Indirect - Indirect Costs	DA - Investigators	DI - Equipment	DI - Staff	DA - Estate Costs	DI - T&S
£2,479	£17,044	£112,277	£26,639	£30,000	£144,755	£42,513	£3,718

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