HR: 1340h
AN: A43C-0115 [Abstracts]
TI: New Ion-Nucleation Mechanism Relevant for the Earth's Atmosphere: Experimental Data
AU: * Pedersen, J P
EM: jopp@spacecenter.dk
AF: Center for Sun-Climate Research, Danish National Space Center
Juliane Maries Vej 30, Copenhagen, DK-2100
Denmark
AU: Svensmark, H
EM: hsv@spacecenter.dk
AF: Center for Sun-Climate Research, Danish National Space Center
Juliane Maries Vej 30, Copenhagen, DK-2100
Denmark
AU: Marsh, N D
EM: ndm@spacecenter.dk
AF: Center for Sun-Climate Research, Danish National Space Center
Juliane Maries Vej 30, Copenhagen, DK-2100
Denmark
AU: Enghoff, M B
EM: enghoff@spacecenter.dk
AF: Center for Sun-Climate Research, Danish National Space Center
Juliane Maries Vej 30, Copenhagen, DK-2100
Denmark
AU: Uggerhøj, U
A43C-0115
AF: Center for Sun-Climate Research, Danish National Space Center
Juliane Maries Vej 30, Copenhagen, DK-2100
Denmark
AB:
Nucleation in the presence of ions has been studied experimentally under conditions that prevail in the lower atmosphere. In
order to observe the properties of nucleation processes below 3 nm, which cannot be detected using standard techniques for
measuring atmospheric aerosol, the sub 3 nm aerosols were grown via the condensation of sulphuric acid to detectable sizes.
By varying the levels of ionization in the chamber differences in the resulting aerosol properties could be explored. Two
types of experiments were performed: 1) A 'burst' of H2SO_4 was produced from a short exposure to UV-light, and 2) steady
state conditions of H2SO_4 were achieved under continuous exposure to UV-light. Data obtained from both experiments will
be presented.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005