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REDRAF SIGNED

Assessing the aerosol radiative impact employing advanced methods to reduce uncertainties in the aerosol optical properties

Total Cost €

EC-Contrib. €

Partnership

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Outcomes and
results

REDRAF project word cloud

Explore the words cloud of the REDRAF project. It provides you a very rough idea of what is the project "REDRAF" about.

refractive ri cross composition microphysical vital effect significantly techniques refine rh balance crucially accurately climate daunting interpreting index understand understanding predicting sign aging absorption hydration instruments sensing quantifying magnitude relative coefficient parameterisations models influence light rigorous radiative governs global particles critical laboratory sensitivities ambient earth single degree forcing sections ssa aerosol characterise alters treatments emphasis aerosols humidity bristol optical size transfer dependent examine anthropogenic albedo energy organic remote imaginary particle chemical direct mixed scattering extinction relationships treatment technique

Project "REDRAF" data sheet

The following table provides information about the project.

Coordinator	UNIVERSITY OF BRISTOL Organization address address: BEACON HOUSE QUEENS ROAD city: BRISTOL postcode: BS8 1QU website: www.bristol.ac.uk contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.
Coordinator Country	United Kingdom [UK]
Project website	https://redrafproject.wordpress.com/
Total cost	195˙454 €
EC max contribution	195˙454 € (100%)
Programme	1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
Code Call	H2020-MSCA-IF-2015
Funding Scheme	MSCA-IF-EF-ST
Starting year	2016
Duration (year-month-day)	from 2016-10-01 to 2018-09-30

Partnership

Take a look of project's partnership.

#	participants	country	role	EC contrib. [€]
1	UNIVERSITY OF BRISTOL UNIVERSITY OF BRISTOL Organization address address: BEACON HOUSE QUEENS ROAD city: BRISTOL postcode: BS8 1QU website: www.bristol.ac.uk contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.	UK (BRISTOL)	coordinator	195˙454.00

Map

Project objective

Understanding how anthropogenic aerosols impact the Earth’s climate system is a daunting challenge. Aerosol radiative effects are strongly dependent on the optical and microphysical properties of the particles. Uncertainties in the absorption coefficient and the single scattering albedo (SSA) contribute significantly to the overall uncertainties in the optical properties of aerosol and their radiative effect. Not only does hydration cause an increase in size, but it also alters the complex refractive index (RI) of the particle; the real part of the RI governs the scattering of light by the aerosol and the imaginary part the degree of absorption. Thus, quantifying the relationships of chemical composition, relative humidity (RH) and particle phase with complex RI is critical for predicting the aerosol radiative forcing. Since these optical properties determine the magnitude and even the sign of the effect of aerosol on the Earth’s energy balance, it is vital that we understand their range. Although techniques have been developed to measure the scattering and absorption cross-sections of ambient and laboratory particles, interpreting measurements can be challenging. Using a new technique to accurately determine the extinction cross-sections of single particles developed in the Bristol laboratory, we will provide a rigorous assessment of treatments used to characterise the optical properties of aerosol. Of particular emphasis, we will examine the optical properties of mixed-component aerosol and the influence of chemical aging of organic aerosol on light absorption. Crucially, the parameterisations for optical properties that result will then be used to refine (and assess sensitivities of direct forcing to) the treatment of aerosol properties in radiative transfer and global climate models. This work will also provide crucial information to improve our understanding of field and remote sensing instruments.

Publications

List of publications.
year	authors and title	journal	last update
2018	Antonio Valenzuela, Jonathan P. Reid, Bryan R. Bzdek, Andrew J. Orr-Ewing Accuracy Required in Measurements of Refractive Index and Hygroscopic Response to Reduce Uncertainties in Estimates of Aerosol Radiative Forcing Efficiency published pages: 6469-6486, ISSN: 2169-897X, DOI: 10.1029/2018jd028365	Journal of Geophysical Research: Atmospheres 123/12	2019-05-28

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The information about "REDRAF" are provided by the European Opendata Portal: CORDIS opendata.