Now showing items 1-10 of 33
In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Closss
Author(s):Pratt, K. A.; Heymsfield, A. J.; Twohy, C. H.; Murphy, Shane; Demott, P. J.; Hudson, James G.; Subramanian, R.; Wang, Zhein; Seinfield, John H.; Prather, K. A.
During the Ice in Clouds Experiment-Layer Clouds (ICE-L), aged biomass-burning particles were identified within two orographic wave cloud regions over Wyoming using single-particle mass spectrometry and electron microscopy. ...
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 ...
Overshooting of Clean Tropospheric Air in the Tropical Lower Stratosphere as Seen by the CALIPSO LiDAR
Author(s):Vernier, J.-P.; Pommereau, J.-P.; Thomason, L. W.; Pelon, J.; Garnier, A.; Deshler, Terry; Jumelet, J.; Nielsen, J. K.
The evolution of aerosols in the tropical upper troposphere/lower stratosphere between June 2006 and October 2009 is examined using the observations of the space borne CALIOP lidar aboard the CALIPSO satellite. Superimposed ...
Dust aerosol impact on North Africa climate : A GCM Investigation of Aerosol-Cloud-Radiation Interactions using A-Train Satellite Data
Author(s):Gu, Y.; Liou, K. N.; Jiang, J. H.; Su, H.; Liu, Xiaohong
The climatic effects of dust aerosols in North Africa have been investigated using the atmospheric general circulation model (AGCM) developed at the University of California, Los Angeles (UCLA). The model includes an ...
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 ...
Examination of Laboratory-Generated Coated Soot Particles : An Overview of the LACIS Experiment in November (LExNo) Campaign
Author(s):Stratmann, F.; Bilde, M.; Dusek, U.; Frank, G. P.; Hennig, T.; Henning, S.; Kiendler‐Scharr, A.; Kiselev, A.; Kristensson, A.; Lieberwirth, I.; Mentel, T. F.; Pöschl, U.; Rose, D.; Schneider, J.; Tillmann, R.; Snider, Jefferson Robert; Walter, S.; Wex, H.
In the suite of laboratory measurements described here and in companion articles we deal with the hygroscopic growth and activation behavior of coated soot particles synthesized to mimic those of an atmospheric aerosol ...
Organic Aerosol Components Observed in Northern Hemispheric Datasets from Aerosol Mass Spectrometry
Author(s):Ng, N. L.; Canagaratna, M. R.; Zhang, Q.; Jimenez, J. L.; Tian, J.; Ulbrich, I. M.; Kroll, J. H.; Docherty, K. S.; Chhabra, P. S.; Bahreini, R.; Murphy, Shane; Seinfeld, J. H.; Hildebrandt, L.; Donahue, N. M.; Decarlo, P. F.; Lanz, V. A.; Prévôt, A. S. H.; Dinar, E.; Rudich, Y.; Worsnop, D. R.
In this study we compile and present results from the factor analysis of 43 Aerosol Mass Spectrometer (AMS) datasets (27 of the datasets are reanalyzed in this work). The components from all sites, when taken together, ...
Evaluating WRF-Chem Aerosol Indirect Effects in Southeast Pacific Marine Stratocumulus during VOCALS-REx
Author(s):Saide, P. E.; Spak, S. N.; Carmichael, G. R.; Mena-Carrasco, M. A.; Yang, Q.; Howell, S.; Leon, D. C.; Snider, Jefferson Robert; Bandy, A. R.; Collett, J. L.; Benedict, K. B.; de Szoeke, S. P.; Hawkins, L. N.; Allen, G.; Crawford, I.; Crosier, J.; Springston, S. R.
We evaluate a regional-scale simulation with the WRF-Chem model for the VAMOS (Variability of the American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx), which sampled the Southeast ...
Radiative Impact of Mineral Dust on Monsoon Precipitation Variability Over West Africa
Author(s):Zhao, C.; Liu, Xiaohong; Leung, L. R.; Hagos, S.
The radiative forcing of dust and its impact on precipitation over the West Africa monsoon (WAM) region is simulated using a coupled meteorology and aerosol/chemistry model (WRF-Chem). During the monsoon season, dust is a ...
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 ...