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Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter
(2020-12-07)
Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...
Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter
(2020-12-07)
Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...
The Universal Cloud and Aerosol Sounding System (UCASS): a low-cost miniature optical particle counter for use in dropsonde or balloon-borne sounding systems
(2019-12-13)
A low-cost miniaturized particle counter has been developed by The University of Hertfordshire (UH) for the measurement of aerosol and droplet concentrations and size distributions. The Universal Cloud and Aerosol Sounding ...
AIITS: Preliminary light scattering data from Tropical Tropopause Layer cirrus
(2015-07-22)
The new optical particle spectrometer AIITS (Aerosol Ice Interface Transition Spectrometer) is the next instrument in the Small Ice Detector (SID) family. Like SID3, it acquires two-dimensional forward scattering patterns ...
Modelling light scattering by absorbing smooth and slightly rough facetted particles
(2015-05)
A method for approximating light scattering properties of strongly absorbing facetted particles which are large compared to the wavelength is presented. It consists in adding the approximated external diffraction and ...
Difficulties in early ice detection with the Small Ice Detector 2 HIAPER (SID-2H) in maritime cumuli
(2014-06)
The Small Ice Detector 2 HIAPER (SID-2H) was used to attempt to detect small ice particles in the early stages of ice formation in the high liquid water environment of tropical maritime cumulus clouds sampled during the ...
Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements
(2014-02-12)
The knowledge of properties of ice crystals such as size, shape, concavity and roughness is critical in the context of radiative properties of ice and mixed-phase clouds. Limitations of current cloud probes to measure these ...
The effective density of small ice particles obtained from in situ aircraft observations of mid-latitude cirrus
(2013-10)
The effective ice-particle density, parametrized through a mass–dimension relation, is widely used in ice microphysical schemes for weather and climate models. In this study, we use aircraft-based observations in mid-latitude ...
Modelling light scattering by rough particles and particulate layers using RTDF
(2013-06-20)
Computations of light-scattering properties for non-axisymmetric particles based on exact methods like the T-matrix [1] and discrete dipole approximation (DDA) [2] have upper size parameter limits of applicability, depending ...
Light scattering by Gaussian rough ice crystals : experimental and modelling results
(2013-06-17)
It is qualitatively well understood that ice and mixed-phase clouds have an important role in the radiation balance and climate of the Earth [1,2]. However, quantitative understanding of these clouds is poor, and is one ...