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5. Validation of GOSAT and OCO-2 against In Situ Aircraft Measurements and Comparison with CarbonTracker and GEOS-Chem over Qinhuangdao, China

Author

Mustafa, Farhan, primary, Wang, Huijuan, additional, Bu, Lingbing, additional, Wang, Qin, additional, Shahzaman, Muhammad, additional, Bilal, Muhammad, additional, Zhou, Minqiang, additional, Iqbal, Rashid, additional, Aslam, Rana Waqar, additional, Ali, Md. Arfan, additional, and Qiu, Zhongfeng, additional

Published
2021
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12. Particulate Characteristics during a Haze Episode Based on Two Ceilometers with Different Wavelengths

Author

Bu Lingbing, Yuan Jing, Huang Xingyou, Gao Haiyang, and Rina Sa

Subjects
Atmospheric Science, Angstrom exponent, Haze, Materials science, 010504 meteorology & atmospheric sciences, extinction, ceilometer, haze, hygroscopic growth, lcsh:QC851-999, Environmental Science (miscellaneous), Particulates, Atmospheric sciences, 01 natural sciences, Ceilometer, 010309 optics, Wavelength, Extinction (optical mineralogy), 0103 physical sciences, lcsh:Meteorology. Climatology, Relative humidity, Visibility, 0105 earth and related environmental sciences
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.

Published
2016

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