Dr William Davies

Postdoctoral Research Assistant

Research Interests:

  • The impact of atmospheric aerosol on clouds and climate.
  • Satellite estimates of aerosol radiative properties.
  • Radiative forcing of the climate system.

Research Projects:

  • The CLoud-Aerosol-Radiation Interactions and Forcing Year 2017 field campaign (CLARIFY) flew from Ascension Island in the south eastern Atlantic. This has delivered airborne, surface-based and satellite measurements which will improve representation of aerosols and clouds and reduce uncertainty in their radiative effects in climate models. Smoke aerosols from Africa are emitted in August and September by agricultural waste burning and forest clearing. Aerosols get transported over the deck of bright stratocumulus clouds that covers the south eastern Atlantic. There they scatter and absorb radiation, called direct effects, and may modify cloud formation and evolution. Climate models disagree in their estimates of direct effects from smoke aerosols in that region. I am assessing version GA7.1 of HadGEM3 modifying the vertical profile of aerosol absorption to match campaign retrievals. I am also investigating the processes which control that vertical profile and assessing the radiative effect of these modifications.
  • Copernicus Atmosphere Monitoring Service (CAMS) : I am part of the CAMS74 team producing quantitative estimates of radiative forcing (RF) with respect to pre-industrial times (PI) using PI concentrations provided in the Fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate Change (IPCC) from year 1750. The production chain being developed uses a CAMS global reanalysis dataset which will include data assimilated from recent satellite launches such as Sentinel-3 in order to produce improved RF estimates.
  • South American Biomass Burning Analysis (SAMBBA) : The intentional burning of rainforest in the Amazon region produces dense clouds of smoke particles (also called biomass burning aerosols). These aerosols can affect local visibility and vegetation, but can also affect the passage of the sun's radiation through the atmosphere and the reflectiveness of clouds, which can ultimately affect global climate. In particular, particles that contain a lot of black carbon can burn off clouds, although the mechanism by which this occurs is poorly understood. I am investigating these effects using data collected by an airborne measurement campaign during 2012 and a large eddy simulation model.

Recent Publications:

Publications for w.h.davies@reading.ac.uk

Jump to: 2015 | 2014 | 2013 | 2010
Number of items: 6.


Davies, W. H. and North, P. R. J. (2015) Synergistic angular and spectral estimation of aerosol properties using CHRIS/PROBA-1 and simulated Sentinel-3 data. Atmospheric Measurement Techniques, 8 (4). pp. 1719-1731. ISSN 1867-8548 doi: https://doi.org/10.5194/amt-8-1719-2015


Davies, W. H. and North, P. R. J. (2014) Synergistic angular and spectral estimation of aerosol properties using CHRIS/PROBA-1 and simulated Sentinel-3~data. Atmospheric Measurement Techniques Discussions, 7 (6). pp. 5381-5422. ISSN 1867-8610 doi: https://doi.org/10.5194/amtd-7-5381-2014


Sobrino, J., Jiménez-Muñoz, J., Brockmann, C., Ruescas, A., Danne, O., North, P., Heckel, A., Davies, W., Berger, M., Merchant, C., Mitraka, Z. and Sòria, G. (2013) Land surface temperature retrieval from Sentinel 2 and 3 Missions. In: Ouwehand, L. (ed.) Proceedings of the Sentinel-3 OLCI/SLSTR and MERIS/(A)ATSR Workshop 15–19 October 2012 Frascati, Italy. ESA Communications. ISBN 9789290922759 (SP-711)

Holzer-Popp, T., de Leeuw, G., Griesfeller, J., Martynenko, D., Klüser, L., Bevan, S., Davies, W., Ducos, F., Deuzé, J. L., Graigner, R. G., Heckel, A., von Hoyningen-Hüne, W., Kolmonen, P., Litvinov, P., North, P., Poulsen, C. A., Ramon, D., Siddans, R., Sogacheva, L., Tanre, D., Thomas, G. E., Vountas, M., Descloitres, J., Griesfeller, J., Kinne, S., Schulz, M. and Pinnock, S. (2013) Aerosol retrieval experiments in the ESA Aerosol_cci project. Atmospheric Measurement Techniques, 6 (8). pp. 1919-1957. ISSN 1867-8548 doi: https://doi.org/10.5194/amt-6-1919-2013

de Leeuw, G., Holzer-Popp, T., Bevan, S., Davies, W. H., Descloitres, J., Grainger, R. G., Griesfeller, J., Heckel, A., Kinne, S., Klüser, L., Kolmonen, P., Litvinov, P., Martynenko, D., North, P., Ovigneur, B., Pascal, N., Poulsen, C., Ramon, D., Schulz, M., Siddans, R., Sogacheva, L., Tanré, D., Thomas, G. E., Virtanen, T. H., von Hoyningen Huene, W., Vountas, M. and Pinnock, S. (2013) Evaluation of seven European aerosol optical depth retrieval algorithms for climate analysis. Remote Sensing of Environment, 162. pp. 295-315. ISSN 0034-4257 doi: https://doi.org/10.1016/j.rse.2013.04.023


Davies, W. H., North, P. R.J., Grey, W. M.F. and Barnsley, M. J. (2010) Improvements in Aerosol Optical Depth Estimation Using Multiangle CHRIS/PROBA Images. IEEE Transactions on Geoscience and Remote Sensing, 48 (1). pp. 18-24. ISSN 0196-2892 doi: https://doi.org/10.1109/TGRS.2009.2027024

This list was generated on Mon Jan 21 04:09:34 2019 UTC.

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