2 edition of Ice-forming nuclei and related aerosol studies found in the catalog.
Ice-forming nuclei and related aerosol studies
|Series||Quaderni de "La Ricerca scientifica" ;, 46|
|LC Classifications||IN PROCESS (ONLINE)|
|The Physical Object|
|Pagination||85 p. ;|
|Number of Pages||85|
|LC Control Number||91171651|
In clouds warmer than about −37 °C where liquid water can persist in a supercooled state, ice nuclei can trigger droplets to freeze. Contact nucleation can occur if an ice nucleus collides with a supercooled droplet, but the more important mechanism of freezing is when an ice nucleus becomes immersed in a supercooled water droplet and then triggers freezing. The emphasis is on improved forecasting of phenomena related to winter storms, including quantitative precipitation forecasting (QPF), snow depth, blizzards, blowing snow, and icing conditions. and ice forming nuclei (IFN) concentrations in regions where boundary layer clouds are prevalent. recorded data on aerosol, cloud and ice.
The poorly understood link between aerosol properties and heterogeneous ice nucleation served as a focus of the Ice in Clouds Experiment–Layer Clouds (ICE-L). In particular, the ability to predict ice formation on the basis of measured aerosol properties and ice nuclei (IN) number concentrations was the overarching focus of this by: He formed the hypothesis that the Jz effects are due to electrical charge deposited on droplets and aerosol particles (notably condensation nuclei and ice-forming nuclei in clouds) that significantly affect scavenging processes and the concentrations of the mater: University of Canterbury, Christchurch, .
include silver iodide aerosol complexes such as silver iodide-silver chloride. Silver iodide is the Environmental impact studies related to silver iodide usage in cloud nuclei, ice forming nuclei, or occasionally freezing nuclei, that spawn ice crystal formation).File Size: KB. Aerosol particles were collected on filters for studies of their ability to nucleate ice during the second Arctic Gas and Aerosol Sampling Program (AGASP-II) in April, The ice nuclei (IN) samples were collected from an aircraft at altitudes ranging from the surface to the vicinity of the tropopause in Arctic locations over Alaska, northern Canada and by:
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The size resolved cloud condensation nuclei (CCN) activity and its prediction based on aerosol hygroscopicity and composition in the Pearl Delta Cited by: 5. THERE is considerable meteorological interest in the nature and concentration of ice-forming nuclei in the atmosphere and their variation with time and weather situation1.
Apart from their Cited by: 5. Conversely, the characteristics of ice-forming nuclei (IN), their origin, composition and concentrations have only seldom been studied. The majority of these studies was conducted along the Antarctica coast, with very few measurements reported for the continental by: According to the most accepted theory, the great majority of atmospheric ice nuclei constitute soil mineral particles.
But some evidence appears to favor the hypothesis of a nonnegligible. INTRODUCTION Two previous studies (Rosinski et al.,) in the field of ocean-derived ice-forming nuclei (Schnell, ) have shown the presence of aerosol particles active as ice-forming nuclei (IFN) over the Pacific Ocean between 7 and 10 latitude and to by: The paper provides a review of past and a few new measurements of Ice-forming Nuclei (IN) in Antarctica.
The few available published data were mostly obtained adopting different devices and. Ice-forming nuclei in continental-maritime air distance from clouds, or (2) the updrafts lifted aerosol particles from the lower altitudes where IFN were present. Georgii () has shown that warm IFN are present in thunderstorm downdrafts at higher concentrations than in the surrounding by: 5.
Between - 7and - 8, ice-forming nuclei were present In all sizes of aerosol particles. It is not possible to know from these experiments whether the same chemical species that were associated with the submlcron-stzed aerosol particles were distributed over all sizes of aerosol particles or whether the larger aerosol particles were of a different chemical composition, which nucleated ice at lower Cited by:  Measurements of the ice nucleating ability of aerosol particles in air masses over Florida having sources from North Africa support the potential importance of dust aerosols for indirectly affecting cloud properties and climate.
The concentrations of ice nuclei within dust layers at particle sizes below 1 μm exceeded 1 cm −3; the highest ever reported with our device at temperatures Cited by: Constantin Andronache, in Mixed-Phase Clouds, 1 Observations.
Chapter 2 discusses the relevance of ice nucleation to mixed-phase clouds, and current research on ice nuclei particles (INPs) in the atmosphere. The existence of mixed-phase clouds is possible because liquid water droplets can exist in a supercooled state at temperatures as low as − 38°C.
A Nature Research Journal. Menu. Subscribe Search SearchCited by: Studies of the earth's climate system indicate that clouds are a major modulating influence. Many cloud processes, however, are not well understood, in particular, the role of ice nucleating aerosol particles (IN, or ice forming nuclei, IFN) for ice forma- tion.
It is known that water clouds, ice clouds and mixed phaseCited by: Ice nuclei measured in the sampled air during and after the ash cloud transit, show an higher concentration during the ash cloud transit, with a ratio of about with respect to the aerosol.
Therefore anthropogenic aerosol and precursor emissions are unlikely to have an effect on cirrus formed by homogeneous freezing.
 Evidence for ice‐forming activity of soot particles of various sizes as contact nuclei has recently been studied in a cloud chamber for temperatures ranging from −5°C to −20°C [Gorbunov et al., ]. They Cited by: Measurements of Atmospheric Proteinaceous Aerosol in the Arctic Using a Selective UHPLC/ESI-MS/MS Strategy.
Challenges and perspectives in outdoor studies. Aerosol Science and Technology59, DOI: / Ice-forming nuclei. The charges are of sufficient magnitude to suggest measurable electrical effects on scavenging of ice-forming nuclei and cloud condensation nuclei.
The results are relevant to the modeling of solar or internally forced changes of J z and space charge on cloud microphysics as a possible cause of small effects on weather and climate. The number of ice crystals which form on the filter is related in sometimes subtle ways to the concentration of ice forming nuclei in the aerosol sample.
In order to enhance experimental control of supersaturation during filter development, condensation nuclei are also deposited on the by: 2. Abstract  Parameterizations for size-dependent aerosols have been implemented in the Canadian Centre for Climate Modelling and Analysis (CCCma) atmospheric general circulation model (AGCM).
This new model version considers comprehensive physical and chemical processes that are associated with the sulphate aerosol size distribution, including nucleation, condensation.
Some of the aerosol particles exposed to that supersaturation will nucleate ice through condensation followed by freezing. Ice‐forming nuclei in snow crystals vary from to 13 µm.
The majority of particles present in snow crystals are by: 8. the presence of culturable droplet nuclei bioaerosol up to at least 6 min after the flush. The high-cistern models also appeared to produce substantially greater concentrations of droplet nuclei aerosol than the low-cistern model, and Jessen observed that the energy of the flush appeared to have an influence on the amount of aerosol Size: KB.
We combine observations from field studies over a year period, from a variety of locations around the globe, to show that the concentrations of ice nuclei active in mixed-phase cloud conditions can be related to temperature and the number concentrations of Cited by: These aerosol particles, which form a subset of the overall atmospheric aerosol population, are called ice-forming nuclei (IN).
Pruppacher and Klett (, chapter ) compiled evidence that IN need to have a size larger than μ m radius to be effective in initiating by: These proceedings give a rather complete overview of the most recent research in the areas of fundamental processes and phase transitions, cloud droplet and ice nucleation in the atmosphere, and aerosol formation and aerosol characteristics in the atmosphere.
Nine review papers on topics of.