1. 'Universality in snowflake aggregation' (2004), Geophys. Res. Lett., 31 L15104
2. 'A theory of growth by differential sedimentation with application to snowflake formation' (2004), Phys. Rev. E, 70 021403
3. 'Radar scattering by aggregate snowflakes' (2006) Q. J. R. Meteorol. Soc. 132 897
3b. Correction to the above paper, QJ 134 457-458
4. 'Theory and observations of ice particle evolution in cirrus using Doppler radar: Evidence for aggregation' (2007) Geophys. Res. Lett. 34 L02824
5. 'The capacitance of pristine ice crystals and aggregate snowflakes' (2008) JAS 65 206-209
6. 'The fall speeds of sub-100 micron ice crystals' (2008) QJ 134 1243-1251
7. 'Testing the influence of small crystals on ice size spectra using Doppler lidar observations' (2009) GRL 36 L12810
8. 'Doppler lidar measurements of oriented planar ice crystals falling from supercooled and glaciated layer clouds' (2010) QJ 136 260-276
9. 'Observations of a glaciating hole-punch cloud' (2010) Weather 65 176-180
10. 'Advances in the estimation of ice particle fall speeds using laboratory and field measurements', Heymsfield and Westbrook (2010) JAS 67 2469-2482
11. 'A method for estimating the turbulent kinetic energy dissipation rate from a vertically pointing Doppler lidar, and independent evaluation from balloon-borne in-situ measurements', O'Connor et al (2010) JTECH 27 1652-1664.
12. 'Estimating drizzle drop size and precipitation rate using two-colour lidar measurements' (2010) Atmos. Meas. Tech. 3 671-681
13. 'Observations of ice multiplication in a weakly convective cell embedded in supercooled mid-level stratus' Crosier et al (2011) ACP. 11 257-273
14. 'Origin of the Parry arc' (2011), QJ, 137 538-543
15. 'Ice crystals growing from vapor in supercooled clouds between -2.5 and -22°C: testing current parameterisation methods' (2011), JAS, 68 2416-2429.
16. 'Radar scattering from ice aggregates using the horizontally aligned oblate spheroid approximation' Hogan et al (2012), JAMC, 51 655-671
17. 'Evidence that ice forms primarily in supercooled liquid clouds at temperatures > -27°C' (2011), GRL 38 L14808 doi: 10.1029/2011GL048021
18. 'Ice formation and development in aged, wintertime cumulus over the UK: observations and modelling' Crawford et al (2012), ACP 12 4963-4985
19. 'Applicability of the Rayleigh-Gans approximation for scattering by snowflakes at microwave frequencies in vertical incidence' Tyynelä et al (2012) , JGR 118 1826-1839
20. 'Observations of a tornadic supercell over Oxfordshire using a pair of Doppler radars' (2012), Weather, 68 128--134
21. 'The formation of ice in a long-lived supercooled layer cloud' (2012), QJRMS 139 2209-2221 DOI: 10.1002/qj.2096
22. 'Microphysical properties of cold frontal rainbands' Crosier et al (2014), QJRMS 140 1257-1268
23. 'A time-series method to identify and correct range sidelobes in meteorological radar data' (2013) J. Atmos. & Ocean. Tech. 30 2417-2225
24. 'G-band atmospheric radars: new frontiers in cloud physics': Battaglia, Westbrook et al, (2014) Atmos. Meas. Tech. 7 1527-1546
25. 'Rayleigh scattering by hexagonal ice crystals and the interpretation of dual-polarisation radar measurements' (2014) Q. J. R. Met. Soc. 140 2090-2096. doi 10.1002/qj.2262
26. 'Equation for the microwave backscatter cross section of aggregate snowflakes using the Self-Similar Rayleigh-Gans Approximation' Hogan and Westbrook (2014), J. Atmos. Sci. 71 3292-3301.
27. Fractal geometry of aggregate snowflakes revealed by triple wavelength radar measurements Stein, Westbrook and Nicol (2015), GRL 42 176-183 DOI: 10.1002/2014GL062170
28. High-Precision Measurements of the Copolar Correlation Coefficient: Non-Gaussian Errors and Retrieval of the Dispersion Parameter μ in Rainfall Keat, Westbrook & Illingworth (2016) JAMC 55> 1615
29. Secondary Ice Production: Current State of the Science and Recommendations for the Future Paul Field, Paul Lawson, Phil Brown, Gary Lloyd, Chris Westbrook, and many many others (2017) AMS monograph DOI: 10.1175/AMSMONOGRAPHS-D-16-0014.1
30. Revealing Layers of Pristine Oriented Crystals Embedded within Deep Ice Clouds using Differential Reflectivity and the Co-Polar Correlation Coefficient Keat and Westbrook (2017), JGR 122 11,737-11,759. doi 10.1002/2017JD026754
31. Using 3-D-printed analogues to investigate the fall speeds and orientations of complex ice particles (2017), Geophys. Res. Lett. 44 7994-8001
32. Analysis of the internal electric fields of pristine ice crystals and aggregate snowflakes, and their effect on scattering McCusker, Westbrook and Moilola (2018), submitted to JQSRT
33. Rapid ice aggregation process revealed through triple-wavelength Doppler spectra radar analysis Barrett, Westbrook, Stein, Nicol (2018), Atmos. Chem. Phys. Discuss.

Comment on small crystal paper by Cooper and Garrett (2011) Atmos. Meas. Tech. Discuss. 4 C1065-C1068

Conference paper on time-dependent ice nucleation (for more details see publication # 21 above), and on small crystals in cirrus (see paper # 7 above):
Stochastic ice nucleation in supercooled clouds, and constraints on the fraction of small ice crystals in glaciated clouds, observed using Doppler lidar and radar

Major conferences

Some other talks

Invited talk at the Met Office in 2002
Theoretical Physics seminar at the University of Warwick in 2003
Lunchtime seminar, Reading Meteorology dept. 2008
Talk, APPRAISE annual meeting, Leeds 2008
Invited talk, Space and Atmospheric Physics Group, Imperial College 2009
Talk and poster at APPRAISE annual meeting, Manchester 2009
Talk, cloud physics across scales meeting, NCAR, 2009
Lecture, Royal Meteorological Society AGM, London, 2009
Talk, RMetS Atmospheric Processes specialist group meeting, Met Office, Exeter, 2011.

PhD Thesis
'Universality in snowflake formation' University of Warwick (2005)

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