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Observational study on salt dust aerosol optical properties using the ground-based and satellite remote sensing

  • role： First author第一作者
  • Affiliation：

    College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China

    China Key Laboratory of Oasis Ecosystem of Education Ministry, Xinjiang University, Urumqi 830046, China

  • Email：zhangzhe_0110@yeah.net
  • Introduction：张喆(1988—　)，女，博士研究生，研究方向为干旱区资源环境遥感。E-mail：zhangzhe_0110@yeah.net
ZHANG Zhe12,  
  • role： Corresponding author通信作者
  • Affiliation：

    College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China

    China Key Laboratory of Oasis Ecosystem of Education Ministry, Xinjiang University, Urumqi 830046, China

  • Email：watarid@xju.edu.cn
  • Introduction：丁建丽(1974—　)，男，教授，研究方向为干旱区资源环境遥感。E-mail：watarid@xju.edu.cn
DING Jianli12*,  
  • Affiliation：

    College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China

    China Key Laboratory of Oasis Ecosystem of Education Ministry, Xinjiang University, Urumqi 830046, China

    Xinjiang Vocational and Technical College of Communication, Urumqi 831401, China

WANG Jinjie123,  
  • Affiliation：

    College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China

    China Key Laboratory of Oasis Ecosystem of Education Ministry, Xinjiang University, Urumqi 830046, China

CHEN Wenqian12

реферат

In the past 50 years, the Ebinur Lake had deteriorated rapidly. The dry lake became a rich source of dust and salt, causing the region to face serious threat of salt dust disaster. At present, studies on salt dust pollution focus on conditions for salt storms, wind erosion intensity of Lake Bottom, and dust fall flux. Few studies investigated the regional air pollution caused by salt dust storms and the optical properties of salt dust aerosols. The temporal variability, vertical distribution, and potential diffusion characteristics of salt dust in Ebinur region were investigated using the ground-based and satellite remote sensing and its potential diffusion characteristics were analyzed using the HYSPLIT model to learn more about aerosol optical properties. The aerosol product data provided by the MODIS were used to obtain the overall evolution trend of dust storms in Ebinur Lake Basin. CALIOP data provided the vertical distribution of aerosol including total attenuated backscatter coefficient, volume depolarization ratio, and color ratio. The AOD and Angstrom exponent obtained by Microtops II sun photometer observations at the Jinghe and Wusu sites were used to investigate the aerosol properties in salt dust storms. The HYSPLIT model was used to simulate the salt dust diffusion trajectory of Ebinur Lake in spring. The degradation of the lake was the main reason for the occurrence of soil salinization and salt dust storms in Ebinur Lake Basin. The influence range of salt dust disaster in Ebinur region was mainly concentrated in the southeast of Ebinur Lake. The most active period of salt dust release and transportation was in spring. Salt dusts were mainly settled in Jinghe area, which was close to the dry lake bottom. The particle size of the aerosol particles in the atmosphere decreases, and the particle size increases with the increase in the distance from the dry lake dust source area. Thus, the area, which was far from the dust source, was not only affected by the Ebinur Lake salt dusts, but was also affected by the local dust source intervention. In the spring, the atmospheric aerosols were mainly in the form of coarse mode, and the dust aerosols were the main factor. The wind speed was the main factor affecting the local aerosol. Salt dust aerosols were mainly concentrated in the range of 0—2 km. The depolarization ratio was 10%—20%, the cumulative frequency was 28.538%, the color ratio was 0.4—0.8, and the cumulative frequency was 51.378%. With increasing height, the irregularity and size of the aerosol decreased, and little possibility was observed for the dust particles to be transported in other areas at high altitude. The aerosol particles mainly showed hydrophobicity when the dust storm occurred. However, aerosol particles, which are affected by the local aerosols, also showed a certain degree of hydrophilicity. The potential diffusion path to the eastern regions mainly affects Jinghe, Wusu, Kuitun, Shawan, Shihezi, Changji, Urumqi, Hami as well as Gansu, Inner Mongolia, Mongolia, Hebei, Liaoning, and other regions. The combination of ground-based and satellite remote sensing techniques to estimate regional aerosol optical properties can provide a scientific reference for the comprehensive understanding of salt dust disasters.

ключеви́че слова́

salt dust aerosol;spatial and temporal characteristics;Microtops II sun photometer;potential diffusion path

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