A campaign for investigating aerosol optical properties during winter hazes over Shijiazhuang, China
A campaign for investigating aerosol optical properties during winter hazes over Shijiazhuang, China
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DOI：
10.1016/j.atmosres.2017.08.018
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发表时间：
2017-12
影响因子：
5.5
通讯作者：
K. Qin;Luyao Wang;Lixin Wu;Jian Xu;Lanlan Rao;H. Letu;Shi Tiewei;Runfeng Wang
中科院分区：
文献类型：
--
作者：
K. Qin;Luyao Wang;Lixin Wu;Jian Xu;Lanlan Rao;H. Letu;Shi Tiewei;Runfeng Wang
作为中国空气污染最严重的河北省的省会，石家庄一直遭受着严重的雾霾污染，尤其是在冬季。2013年末至2014年初，在石家庄市开展了一项研究雾霾条件下气溶胶光学性质的综合活动，该活动使用了太阳光度计、气象仪和激光雷达。结果表明，在测期内，石家庄灰霾天气比北京灰霾天气更为严重和频繁。在石家庄上空重污染条件下(PM2.5g/m~3,150mμg/m~3)，由于吸湿性生长，AOD500 nm的细模分数大于0.80，Angstrom指数更加弥散。无论是本次研究还是2013年1月的严重灰霾天气，石家庄上空的SSA平均值都小于北京上空的SSA平均值，说明石家庄上空有更多的细模吸收粒子。与北京相比，石家庄地区折射率虚部更显着的光谱依赖性意味着更大的棕色碳(BRC)的相对大小。与中国其他城市相比，中国的黑碳(BC)测量记录非常高，BC/PM2.5的比例更大(平均为12.11%)。高碳质气溶胶(BC和BRC)应归因于大量的煤炭消耗。在BC浓度较高的灰霾期间，日最大行星边界层(PBL)高度始终低于500米，这表明BC气溶胶对PBL的发展产生了影响，从而加剧了地面灰霾的污染。
As the capital of the most air-polluted Hebei province in China, Shijiazhuang has been suffering serious haze pollutions especially during wintertime. An integrated campaign for investigating aerosol optical properties under haze conditions over Shijiazhuang were carried out using a sunphotometer, an aethalometer and a lidar in the winter from late 2013 to early 2014. The results indicated that the haze episodes during the measurement period were severer and more frequent over Shijiazhuang than Beijing. Under heavy pollution conditions (PM2.5 > 150 μg/m3) over Shijiazhuang, fine-mode fractions of AOD500nm were larger than 0.80 with more dispersive angstrom exponent due to hygroscopic growth. The mean values of SSA over Shijiazhuang were smaller than those over Beijing both in this study and the severe haze episodes in January 2013, suggesting that there were more fine-mode absorbing particles over Shijiazhuang. More significant spectrally-dependence of imaginary part of refractive index over Shijiazhuang implies larger relative magnitude of brown carbon (BrC) as compared to Beijing. The black carbon (BC) measurement displayed extremely high records with a larger ratio of BC to PM2.5 (12.11% in average) comparing with other cities in China. The high carbonaceous aerosols (BC and BrC) should be attributed to large amounts of coal consumption. During the hazes with high BC concentrations, the daily maximal planetary boundary layer (PBL) heights were consistently lower than 500 m, implying the impacts of BC aerosols on the PBL development and hence enhance the surface haze pollution.