Now showing items 1-10 of 16
Ice Initiation by Aerosol Particles : Measured and Predicted Ice Nuclei Concentrations Versus Measured Ice Crystal Concentrations in an Orographic Wave Cloud
Author(s):Eidhammer, T.; DeMott, P. J.; Prenni, A. J.; Petters, M. D.; Twohy, C. H.; Rogers, D. C.; Stith, J.; Heymsfield, A.; Wang, Z.; Pratt, K. A.; Prather, K. A.; Murphy, Shane; Seinfeld, J. H.; Subramanian, R.; Kreidenweis, S. M.
The initiation of ice in an isolated orographic wave cloud was compared with expectations based on ice nucleating aerosol concentrations and with predictions from new ice nucleation parameterizations applied in a cloud ...
Relationships Between Ice Water Content and Volume Extinction Coefficient from in Situ Observations for Temperatures from 0° to -86°C : Implications for Spaceborne Iidar Retrievals
Author(s):Heymsfield, A.; Winker, D.; Avery, M.; Vaughan, M.; Diskin, G.; Deng, Min; Mitev, V.; Matthey, R.
An examination of 2 yr of Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) lidar observations and CloudSat cloud radar observations shows that ice clouds at temperatures below about -45°C frequently ...
Soot Microphysical Effects on Liquid Clouds, a Multi-Model Investigation
Author(s):Koch, D.; Balkanski, Y.; Bauer, S. E.; Easter, R. C.; Ferrachat, S.; Ghan, S. J.; Hoose, C.; Iversen, T.; Kirkevåg, A.; Kristjansson, J. E.; Liu, Xiaohong; Lohmann, U.; Menon, S.; Quaas, J.; Schulz, M.; Seland, Ø.; Takemura, T.; Yan, N.
We use global models to explore the microphysical effects of carbonaceous aerosols on liquid clouds. Although absorption of solar radiation by soot warms the atmosphere, soot may cause climate cooling due to its contribution ...
Calibration of the Passive Cavity Aerosol Spectrometer Probe for Airborne Determination of the Size Distribution
Author(s):Cai, Y.; Snider, Jefferson Robert; Wechsler, P.
This work describes calibration methods for the particle sizing and particle concentration systems of the passive cavity aerosol spectrometer probe (PCASP). Laboratory calibrations conducted over six years, in support of ...
Aerosol and Gas Re-Distribution by Shallow Cumulus Clouds : An Investigation Using Airborne Measurements
Author(s):Wonaschuetz, Anna; Sorooshian, Armin; Ervens, Barbara; Chuang, Patrick Y.; Feingold, Graham; Murphy, Shane; de Gouw, Joost; Warneke, Carsten; Jonsson, Haflidi H.
Aircraft measurements during the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) are used to examine the influence of shallow cumulus clouds on vertical profiles of aerosol chemical composition, ...
Comparison of measured and calculated scattering from surface aerosols with an average, a size-dependent, and a time-dependent refractive index
Author(s):Cai, Yong; Montague, Derek C.; Deshler, Terry
Mid-continental surface aerosols have been measured at a small, minimally polluted city in summer and winter and on a nearby remote mountain in summer. Aerosol scattering, absorption, size distribution, and composition ...
Intercomparison of Cloud Condensation Nuclei and Hygroscopic Fraction Measurements : Coated Soot Particles Investigated during the LACIS Experiment in November (LExNo)
Author(s):Snider, Jefferson Robert; Wex, H.; Rose, D.; Kristensson, A.; Stratmann, F.; Hennig, T.; Henning, S.; Kiselev, A.; Bilde, M.; Burkhart, M.; Dusek, U.; Frank, G. P.; Kiendler‐Scharr, A.; Mentel, T. F.; Petters, M. D.; Pöschl, U.
Four cloud condensation nuclei (CCN) instruments were used to sample size-selected particles prepared at the Leipzig Aerosol Cloud Interaction Simulator facility. Included were two Wyoming static diffusion CCN instruments, ...
Spatial Distribution of Mineral Dust and its Shortwave Radiative Forcing Over North Africa : Modeling Sensitivities to Dust Emissions and Aerosol Size Treatments, The
Author(s):Zhao, C.; Liu, Xiaohong; Leung, L. R.; Johnson, B.; McFarlane, S. A.; Gustafson, W. I., Jr.; Fast, J. D.; Easter, R.
A fully coupled meteorology-chemistry-aerosol model (WRF-Chem) is applied to simulate mineral dust and its shortwave (SW) radiative forcing over North Africa. Two dust emission schemes (GOCART and DUSTRAN) and two aerosol ...
Evaluation of Collocated Measurements of Radar Reflectivity and Particle Sizes in Ice Clouds
Author(s):Pokharel, Binod; Vali, Gabor
Measured 94-GHz reflectivity in midlevel, stratiform ice clouds was compared with reflectivity calculated from size distributions determined with a particle imaging probe. The radar and the particle probe were carried on ...
Optimal Estimation Retrieval of Aerosol Microphysical Properties from SAGE II Satellite Observations in the Volcanically Unperturbed Lower Stratosphere
Author(s):Wurl, D.; Grainger, R. G.; McDonald, A. J.; Deshler, Terry
Stratospheric aerosol particles under non-volcanic conditions are typically smaller than 0.1 μm. Due to fundamental limitations of the scattering theory in the Rayleigh limit, these tiny particles are hard to measure by ...