- UHRA Home
- Browsing by Author
Browsing by Author "Smith, Helen"
Now showing items 1-6 of 6
-
Cloud chamber laboratory investigations into scattering properties of hollow ice particles
Smith, Helen; Connolly, Paul; Baran, Anthony; Hesse, Evelyn; Smedley, Andrew; Webb, Ann (2015-05-01)Measurements are presented of the phase function, P11, and asymmetry parameter, g, of five ice clouds created in a laboratory cloud chamber. At −7 °C, two clouds were created: one comprised entirely of solid columns, and ... -
Exact and near backscattering measurements of the linear depolarisation ratio of various ice crystal habits generated in a laboratory cloud chamber
Smith, Helen; Connolly, Paul; Webb, Ann; Baran, Anthony (2016-07-01)Ice clouds were generated in the Manchester Ice Cloud Chamber (MICC), and the backscattering linear depolarisation ratio, δ, was measured for a variety of habits. To create an assortment of particle morphologies, the ... -
Improved understanding of the vertical distribution of simulated dust distribution in the Saharan Air Layer during the ICE-D field campaign with the WRF-CHEM model
Chiao, Sen; Jenkins, Gregory; Ulanowski, Zbigniew; Smith, Helen (2016-01-11)During the period of 4-27 August of 2015, the UK Ice in dust clouds experiment will take place in Cape Verde. UK_ICE-D will characterize aerosol particles and their ability to act as ice nuclei (IN) and cloud condensation ... -
Measurement report: Balloon-borne in-situ profiling of Saharan dust over Cyprus with the UCASS optical particle counter
Kezoudi, Maria; Tesche, Matthias; Smith, Helen; Ulanowski, Zbigniew; Amiridis, Vassilis; Mueller, Detlef; Weinzierl, Bernadett; Tsekeri, Alexandra; Baars, Holger; Dollner, Maximilian; Estellés, Víctor; Bühl, Johannes (2021-05-05)This paper presents measurements of mineral dust concentration in the diameter range from 0.4 to 14.0 μm with a novel balloon-borne optical particle counter, the Universal Cloud and Aerosol Sounding System (UCASS). The ... -
A Universal Cloud and Aerosol Sounding System (UCASS) based on wide angle light scattering
Smith, Helen; Ulanowski, Zbigniew; Stanley, Warren; Kaye, Paul; Hirst, Edwin (2016-04-05)Summary This presentation discusses a new optical particle counter design, developed at the Centre for Atmospheric and Instrumentation Research, University of Hertfordshire. The Universal Cloud and Aerosol Sounding System ... -
Using laboratory and field measurements to constrain a single habit shortwave optical parameterization for cirrus
Smith, Helen; Baran, Anthony; Hesse, Evelyn; Hill, Peter; Connolly, Paul; Webb, Ann (2016-11-01)A single habit parameterization for the shortwave optical properties of cirrus is presented. The parameterization utilizes a hollow particle geometry, with stepped internal cavities as identified in laboratory and field ...