搜索结果: 1-15 共查到“大气化学 Nucleation”相关记录46条 . 查询时间(0.062 秒)
The ice nucleation ability of one of the most abundant types of fungal spores found in the atmosphere
the most abundant types fungal spores the atmosphere
2011/2/25
Recent atmospheric measurements show that biological particles are a potentially important class of ice nuclei. Types of biological particles that may be good ice nuclei include bacteria, pollen and f...
Irreversible loss of ice nucleation active sites in mineral dust particles caused by sulphuric acid condensation
ice nucleation active sites mineral dust particles sulphuric acid condensation
2010/12/20
During the FROST-2 (FReezing Of duST) measurement campaign conducted at the Leipzig Aerosol Cloud Interaction Simulator (LACIS), we investigated changes in the ice nucleation properties of 300 nm Ariz...
High variability of the heterogeneous ice nucleation potential of oxalic acid dihydrate and sodium oxalate
the heterogeneous ice nucleation oxalic acid dihydrate sodium oxalate
2010/8/25
The heterogeneous ice nucleation potential of airborne oxalic acid dihydrate and sodium oxalate particles in the deposition and condensation mode has been investigated by controlled expansion cooling ...
Enhancing effect of dimethylamine in sulfuric acid nucleation in the presence of water – a computational study
dimethylamine sulfuric acid nucleation the presence of water
2010/8/13
We have studied the hydration of sulfuric acid – ammonia and sulfuric acid – dimethylamine clusters using quantum chemistry. We calculated the formation energies and thermodynamics for clusters of one...
Factors influencing the contribution of ion-induced nucleation in a boreal forest, Finland
ion-induced nucleation a boreal forest Finland
2010/8/12
We present the longest series of measurements so far (2 years and 7 months) made with an Ion-DMPS at the SMEAR II measurement station in Hyytiälä, Southern Finland. We show that the classifi...
Homogeneous nucleation of sulfuric acid and water mixture: experimental setup and first results
Homogeneous nucleation sulfuric acid and water mixture
2010/8/12
In this study we introduce a new flow tube suitable for binary and ternary homogeneous nucleation studies. The production of sulfuric acid and water vapor mixture, the experimental setup and the metho...
Depositional ice nucleation on solid ammonium sulfate and glutaric acid particles
Depositional ice nucleation solid ammonium sulfate glutaric acid particles
2010/3/16
Heterogeneous ice nucleation on solid ammonium sulfate and glutaric acid particles was studied using optical microscopy and Raman spectroscopy. Optical microscopy was used to detect selective nucleati...
Numerical simulations of contrail-to-cirrus transition – Part 2: Impact of initial ice crystal number, radiation, stratification, secondary nucleation and layer depth
contrail-to-cirrus transition initial ice crystal number secondary nucleation layer depth
2010/2/21
Simulations of contrail-to-cirrus transition were performed with an LES model. In Part 1 the impact of relative humidity, temperature and vertical wind shear was explored in a detailed parametric stud...
Ice nucleation and cloud microphysical properties in tropical tropopause layer cirrus
Ice nucleation cloud microphysical properties tropical tropopause layer cirrus
2010/2/21
In past modeling studies, it has generally been assumed that the predominant mechanism for nucleation of ice in the uppermost troposphere is homogeneous freezing of aqueous aerosols. However, recent i...
Kinetic modeling of nucleation experiments involving SO2 and OH: new insights into the underlying nucleation mechanisms
Kinetic modeling nucleation experiments SO2 OH underlying nucleation mechanisms
2009/11/9
Nucleation is an important source of atmospheric aerosols which have significant climatic and health implications. Despite intensive theoretical and field studies over the past decades, the dominant n...
An investigation of nucleation events in a coastal urban environment in the Southern Hemisphere
nucleation events coastal urban environment Southern Hemisphere
2009/11/9
Ambient aerosols play an important role in atmospheric processes affecting the human and natural environments. They affect air quality, reduce visibility, and induce climate change by directly scatter...
Simulation of particle size distribution with a global aerosol model: contribution of nucleation to aerosol and CCN number concentrations
particle size distribution global aerosol model aerosol CCN number concentrations
2009/11/9
An advanced particle microphysics model with a number of computationally efficient schemes has been incorporated into a global chemistry transport model (GEOS-Chem) to simulate particle number size di...
Corrigendum to “The role of ammonia in sulfuric acid ion induced nucleation”published in Atmos. Chem. Phys., 8, 2859–2867, 2008
ammonia sulfuric acid ion nucleation
2009/10/9
We have found some numerical errors in our paper “The
role of ammonia in sulfuric acid ion induced nucleation”
by I. K. Ortega et al. (Atmos. Chem. Phys., 8, 2859–
2867, 2008). We discovered that i...
Effect of chemical mixing state on the hygroscopicity and cloud nucleation properties of calcium mineral dust particles
chemical mixing hygroscopicity cloud nucleation properties calcium mineral dust particles
2009/6/2
Atmospheric mineral dust particles can alter cloud properties and thus climate by acting as cloud condensation nuclei (CCN) that form cloud droplets. The CCN activation properties of various calcium m...
Modelling of cirrus clouds – Part 2: Competition of different nucleation mechanisms
Modelling of cirrus clouds different nucleation mechanisms
2009/5/7
We study the competition of two different freezing mechanisms (homogeneous and heterogeneous freezing) in the same environment for cold cirrus clouds. To this goal we use the recently developed and va...