搜索结果: 1-14 共查到“大气科学 Freezing”相关记录14条 . 查询时间(0.116 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...
Introducing the bromide/alkalinity ratio for a follow-up discussion on "Precipitation of salts in freezing seawater and ozone depletion events: a status report", by Morin et al., published in Atmos. Chem. Phys., 8, 7317–7324, 2008
the bromide/alkalinity ratio freezing seawater ozone depletion events salts
2010/8/25
Sander et al. (2006) proposed that CaCO3 precipitation can be an important factor in triggering tropospheric ozone depletion events. Recently, Morin et al. (2008b) presented calculations with the FREZ...
Heterogeneous freezing of droplets with immersed mineral dust particles – measurements and parameterization
droplets immersed mineral dust particles measurements parameterization
2010/8/12
During the measurement campaign FROST (FReezing Of duST), LACIS (Leipzig Aerosol Cloud Interaction Simulator) was used to investigate the immersion freezing behavior of size selected, coated and uncoa...
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...
Freezing of water droplets colliding with kaolinite particles
water droplets colliding kaolinite particles
2009/7/15
Contact freezing of single supercooled water droplets colliding with kaolinite dust particles has been investigated. The experiments were performed with droplets levitated in an electrodynamic balance...
Studies of heterogeneous freezing by three different desert dust samples
heterogeneous freezing desert dust samples
2009/5/6
We present results of experiments at the aerosol interactions and dynamics in the atmosphere (AIDA) chamber facility looking at the freezing of water by three different types of mineral particles at t...
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...
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...
Freezing thresholds and cirrus cloud formation mechanisms inferred from in situ measurements of relative humidity
Freezing thresholds cirrus cloud formation mechanisms humidity
2009/3/11
Factors controlling the microphysical link between distributions of relative humidity above ice saturation in the upper troposphere and lowermost stratosphere and cirrus clouds are examined with the h...
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...
Heterogeneous freezing of single sulfuric acid solution droplets: laboratory experiments utilizing an acoustic levitator
Heterogeneous freezing single sulfuric acid solution droplets laboratory experiments acoustic levitator
2009/3/6
The heterogeneous freezing temperatures of single binary sulfuric acid solution droplets were measured in dependency of acid concentration down to temperatures as low as -50°C. In order to avoid influ...
Repeatability and randomness in heterogeneous freezing nucleation
heterogeneous nucleation freezing
2008/11/17
This study is aimed at clarifying the relative importance of the specific character of the nuclei and of the duration of supercooling in heterogeneous freezing nucleation by immersed impurities. Labor...