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| Observational study of the spatial-temporal distribution of cloud condensation nuclei in Shanxi Province, China |
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Abstract Observational data of Cloud Condensation Nuclei (CCN) from January to December 2011 was used to analyze the CCN spatial-temporal distribution properties including the seasonal, monthly and daily distribution in Shanxi Province, and the results were compared with the similar researches in other places of China and abroad. The CCN number concentration (NCCN) showed obvious seasonal variation, the average value of NCCN was highest in Winter and lowest in Summer. The maximum NCCN occurred in January and the lowest value occurred in June. More precipitation days in summertime had strong wet scavenging effect on NCCN. NCCN significantly increased during the local winter heating period. A bimodal pattern was presented in the NCCN diurnal variation. Two peaks appeared at 07:00-11:00 am and 17:00-20:00 pm, respectively. The fitted CCN spectra of four seasons were obtained by using the expression N=CSk. The fitted parameters C were 10983, 2454, 7614 and 16421 for Spring, Summer, Autumn and Winter, and all the values of k were less than 1, which showed the typical continental nuclei spectrum characteristics. The NCCN vertical profiles were acquired based on the airborne measurements of CCN in summertime of Shanxi, 2013. The largest NCCN appeared close to the ground surface, and the NCCN decreased with height. The average magnitude of NCCN was 103cm-3below 2000m height and 102cm-3 above 3000m height.
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Received: 26 December 2014
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