Vertical Observation Case Study of Cloud Condensation Nuclei in a Cloudless Sky
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Abstract:
Vertical distributions of cloud condensation nuclei (CCN) in a cloudless sky were observed by the DMT (Droplet Measurement Technologies) CCN counter mounted on an AN26 airplane in the western Guanzhong area of Shaanxi Province on 13 October 2009. The results of observation show that the ground average concentration of CCN was more than 10000 cm-3 (supersaturation was 02%) under a cloudless sky condition, and the ground CCN concentration for foggy days on 7 October 2009 was significantly higher. The CCN concentration tends to decrease with height. CCN concentration was high below 1500 m, with the mean CCN concentration being 8827 /cm3, 4439 /cm3 , 456 /cm3, 504/ cm3 (supersaturation equals 04%) at the levels of 1000 m, 1550 m, 4100 m, 5500 m, respectively.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.