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Atmosphere 2016, 7(2), 20; doi:10.3390/atmos7020020

Particulate Characteristics during a Haze Episode Based on Two Ceilometers with Different Wavelengths

1
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Meteorological Bureau of Wu Jiang County in Jiangsu Province, Suzhou 215200, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert W. Talbot
Received: 10 December 2015 / Revised: 17 January 2016 / Accepted: 19 January 2016 / Published: 29 January 2016
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Abstract

To investigate the particulate characteristics of a haze episode, data from two ceilometers with wavelengths of 532 nm and 910 nm, respectively, were studied intensively. By combining the data from the ceilometers with data from a sounding balloon, an automatic meteorological station, and a Grimm 180 PM instrument, analyses of the haze process of a short haze event were performed. The results showed that the relatively calm weather conditions were favorable to the occurrence of the haze and that higher relative humidity had a great influence on visibility. The extinction profiles from the ceilometers reflected the existence of an inverted structure of the temperature profiles and demonstrated the extinction differences at two different wavelengths. Because extinction has a positive correlation with relative humidity, the effect of hygroscopic growth was analyzed at the two different wavelengths. As hygroscopic growth of the particles proceeded, the longer wavelength became more sensitive to the large particles, and vice versa. The hygroscopic growth factor and the Angstrom exponent showed a negative correlation, and the correlation coefficients at 532 nm and 910 nm were 0.54 and 0.86, respectively. The accumulation mode particles were more stable through time than the coarse mode particles, and the variation of the coarse mode particles coincided well with the variation of the Angstrom exponent from the two ceilometers. View Full-Text
Keywords: ceilometer; extinction; haze; hygroscopic growth ceilometer; extinction; haze; hygroscopic growth
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yuan, J.; Bu, L.; Huang, X.; Gao, H.; Sa, R. Particulate Characteristics during a Haze Episode Based on Two Ceilometers with Different Wavelengths. Atmosphere 2016, 7, 20.

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