- UHRA Home
- Browsing by Author
Browsing by Author "Ulanowski, Joseph"
Now showing items 1-15 of 15
-
AIITS: Preliminary light scattering data from Tropical Tropopause Layer cirrus
Stopford, Chris; Kaye, Paul H.; Ulanowski, Joseph; Hirst, Edwin; Greenaway, Richard; Dorsey, James; Gallagher, Martin; Woods, Sarah; Lawson, Paul; Thornberry, Troy; Rollins, Drew; Harris, Neil (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 ... -
Atmospheric dust charging, vertical profiles, and optical properties measured in the Arabian Peninsula during the DREAME campaign
Ulanowski, Joseph; Sabbah, Ismail; Harrison, R.G.; Nicoll, K.A.; Hirst, Edwin; Kaye, Paul H.; Al-Abbadi, Naif; Rogers, George (2010)Polarimetric observations of atmospheric Saharan dust over the Canary Islands have provided strong evidence for the presence of vertically aligned particles. The alignment was thought to be due to the electric field present ... -
Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter
Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (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
Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (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, ... -
Difficulties in early ice detection with the Small Ice Detector 2 HIAPER (SID-2H) in maritime cumuli
Johnson, Alexandria; Lasher-Trapp, Sonia; Bensemer, Aaron; Ulanowski, Joseph; Heymsfield, Andrew J. (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 ... -
The effective density of small ice particles obtained from in situ aircraft observations of mid-latitude cirrus
Cotton, Richard; Field, P.R.; Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Crawford, I.A.; Crosier, J.; Dorsey, James (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 ... -
Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements
Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Cotton, Richard J.; Hesse, Evelyn; Collier, Christopher T. (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 ... -
Light scattering by Gaussian rough ice crystals : experimental and modelling results
Collier, Christopher Thomas; Hesse, Evelyn; Ulanowski, Joseph; Penttila, Antti; Nousiainen, Timo; Brousseau, Emmanuel (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 ... -
Measurements of atmospheric volcanic ash using an aerosol radiosonde
Ulanowski, Joseph; Harrison, R.G.; Nicoll, K.A. (2010)A low-cost, miniature aerosol particle counter has been developed, intended for use with balloon-borne radiosondes. The counter provides a size distribution in five size bins and is interfaced to a Vaisala RS92 radiosonde, ... -
Method and Apparatus for the Detection of Asbestos Fibres
School of Physics, Astronomy and Mathematics; Particle Instruments and diagnostics; Ulanowski, Joseph; Kaye, Paul H. (2002-05-01) -
Miniature, low-cost optical particle counters
Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Wieser, Andreas; Stanley, Warren (2013)A range of miniature, low-cost optical particle counters for characterizing atmospheric particles has been developed. They are intended for use with disposable balloon-borne radiosondes, dropsondes or in dense ground-based ... -
Modelling light scattering by absorbing smooth and slightly rough facetted particles
Hesse, Evelyn; Collier, C. T.; Penttilä, Antti; Nousiainen, Timo; Ulanowski, Joseph; Kaye, Paul H. (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 ... -
Modelling light scattering by rough particles and particulate layers using RTDF
Hesse, Evelyn; Collier, Christopher Thomas; Goldstone, Mica; Ulanowski, Joseph; Kaye, Paul H. (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 ... -
Radiosonde aerosol counter for vertical profiling of atmospheric dust
Ulanowski, Joseph; Hirst, Edwin; Kaye, Paul H.; Harrison, R.G.; Nicoll, K.A.; Rogers, George (2010)A low-cost, miniature aerosol particle counter has been developed, intended for use with balloon-borne meteorological radiosondes. It is particularly suitable for airborne mineral dust measurements. Ambient air is drawn ... -
The Universal Cloud and Aerosol Sounding System (UCASS): a low-cost miniature optical particle counter for use in dropsonde or balloon-borne sounding systems
Smith, Helen R.; Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Stanley, Warren; Kaye, Richard; Wieser, Andreas; Stopford, Chris; Kezoudi, Maria; Girdwood, Joseph; Greenaway, Richard; MacKenzie, A Robert (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 ...