期刊
ATMOSPHERIC RESEARCH
卷 78, 期 3-4, 页码 182-189出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2005.03.008
关键词
pollen; ice nucleating ability; immersion freezing; contact freezing; median freezing temperature
Based on earlier experimental studies, the ice nucleating abilities of further pollen types were investigated in the immersion and contact freezing modes. The studies were carried out at the Mainz vertical wind tunnel with freely floating supercooled droplets down to -28 degrees C. The pollen had diameters between 26 and 28 mu m and correspondingly low sink velocities around 2.5 cm s(-1). The radii of the studied drops were calculated from the recorded wind velocity and for both freezing modes the radii of the observed droplets varied between 315 and 380 mu m. Immersion freezing experiments were conducted with pollen particles added to the droplets while in contact freezing experiments supercooled droplets were subjected to a burst of pollen particles. The median freezing temperatures found in the immersion freezing mode were: -13.5 degrees C (alder), -21.5 degrees C (lombardy poplar), -21.0 degrees C (redtop grass) and -19.8 degrees C (kentucky blue). The median freezing temperatures in the contact freezing mode were found as: -12.6 degrees C (alder), -17.9 degrees C (lombardy poplar), -18.7 degrees C (redtop grass) and -16.1 degrees C (kentucky blue). The results show that the ice nucleating ability of pollen is not restricted to single pollen types but seems to be a general pollen property. (c) 2005 Elsevier B.V. All rights reserved.
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