搜索结果: 1-15 共查到“大气科学 Homogeneous”相关记录20条 . 查询时间(0.046 秒)
Volume nucleation rates for homogeneous freezing in supercooled water microdroplets: results from a combined experimental and modelling approach
Volume nucleation rates supercooled water microdroplets a combined experimental and modelling approach
2010/9/1
Temperature-dependent volume nucleation rate coefficients for supercooled water droplets, JV(T), are derived from infrared extinction measurements in a cryogenic laminar aerosol flow tube using a micr...
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...
Particle formation in the Arctic free troposphere during the ASTAR 2004 campaign: a case study on the influence of vertical motion on the binary homogeneous nucleation of H2SO4/H2O
Arctic free troposphere ASTAR 2004 campaign binary homogeneous nucleation of H2SO4/H2O
2010/2/21
During the ASTAR (Arctic Study of Tropospheric Aerosol and Radiation) campaign nucleation mode particles (4 to 13 nm) were quite frequently observed at altitudes below 4000 m. However, in the upper fr...
Parameterizing the competition between homogeneous and heterogeneous freezing in ice cloud formation – polydisperse ice nuclei
heterogeneous freezing ice cloud formation polydisperse ice nuclei
2009/8/25
This study presents a comprehensive ice cloud formation parameterization that computes the ice crystal number, size distribution, and maximum supersaturation from precursor aerosol and ice nuclei. The...
Homogeneous vs. heterogeneous nucleation in water-dicarboxylic acid systems
Homogeneous heterogeneous nucleation water-dicarboxylic acid systems
2009/3/31
Binary heterogeneous nucleation of water-succinic/glutaric/malonic/adipic acid on nanometer-sized particles is investigated within the frame of classical heterogeneous nucleation theory. Homogeneous n...
Thermodynamics of homogeneous nucleation of ice particles in the polar summer mesosphere
Thermodynamics of homogeneous nucleation ice particles polar summer mesosphere
2009/3/13
We present the hypothesis of homogeneous nucleation of ice nano-particles in the polar summer mesosphere. The nucleation of condensed phase is traced back to the first step on the formation pathway, w...
Parameterizing the competition between homogeneous and heterogeneous freezing in cirrus cloud formation – monodisperse ice nuclei
homogeneous and heterogeneous freezing cirrus cloud formation monodisperse ice nuclei
2009/3/12
We present a parameterization of cirrus cloud formation that computes the ice crystal number and size distribution under the presence of homogeneous and heterogeneous freezing. The parameterization is...
Homogeneous nucleation of NAD and NAT in liquid stratospheric aerosols: insufficient to explain denitrification
Homogeneous nucleation NAD NAT liquid stratospheric aerosols
2009/3/12
The nucleation of NAD and NAT from HNO3/H2O and HNO3/H2SO4/H2O solution droplets is investigated both theoretically and experimentally with respect to the formation of polar stratospheric clouds (PSCs...
Properties of subvisible cirrus clouds formed by homogeneous freezing
subvisible cirrus clouds homogeneous freezing
2009/3/12
Number concentrations and mean sizes of ice crystals and derived microphysical and optical properties of subvisible cirrus clouds (SVCs) formed by homogeneous freezing of supercooled aerosols are inve...
Comment on evidence for surface-initiated homogeneous nucleation
surface-initiated homogeneous nucleation
2009/3/11
We investigate theoretical, laboratory, and atmospheric evidence for a recently proposed hypothesis: homogeneous ice nucleation initiates at the surface, not in the volume, of supercooled water drops....
Commentary on“Homogeneous nucleation of NAD and NAT in liquid stratospheric aerosols: insufficient to explain denitrification”by Knopf et al.
Homogeneous nucleation NAD NAT liquid stratospheric aerosols
2009/3/11
In a recent published paper Knopf et a1. (2002) have suggested that the homogeneous freezing behavior of stratospheric aerosols, under polar winter conditions, can be simulated experimentally in large...
On the transition between heterogeneous and homogeneous freezing
transition heterogeneous homogeneous freezing
2009/3/10
Box model simulations of an uplifting and adiabatically cooling cloud of aerosol have been performed in order to study the transition between cirrus formation dominated by homogeneous nucleation of ic...
Experimental investigation of homogeneous freezing of sulphuric acid particles in the aerosol chamber AIDA
homogeneous freezing sulphuric acid particles aerosol chamber AIDA
2009/3/10
The homogeneous freezing of supercooled H2SO4/H2O solution droplets was investigated in the aerosol chamber AIDA (Aerosol Interactions and Dynamics in the Atmosphere) of Forschungszentrum Karlsruhe. 2...
Numerical simulations of homogeneous freezing processes in the aerosol chamber AIDA
Numerical simulations homogeneous freezing processes aerosol chamber AIDA
2009/3/10
The homogeneous freezing of supercooled H2SO4/H2O aerosols in an aerosol chamber is investigated with a microphysical box model using the activity parameterization of the nucleation rate by Koop et al...
Laboratory studies of the homogeneous nucleation of iodine oxides
Laboratory homogeneous nucleation iodine oxides
2009/2/20
Laboratory experimental results of iodine oxide nucleation are presented. Nucleation was induced following UV photolysis of CF3I or CH2I2 in the presence of excess ozone. Measurements were performed i...