主办单位：中国气象局沈阳大气环境研究所
国际刊号：ISSN 1673-503X
国内刊号：CN 21-1531/P
气象与环境学报

气象与环境学报 ›› 2014, Vol. 30 ›› Issue (2): 67-73.doi:

• 论　文 • 上一篇    下一篇

东亚沙尘源区与下游地区气溶胶光学特性比较

郑玉琦1   于兴娜2   项磊2  登曾然登3  德庆央宗4   

  1. 1.乾安县气象局，吉林 乾安 131400；2.南京信息工程大学大气物理学院，江苏 南京 210044；3.拉孜县气象局，西藏 拉孜 858100；4.察隅县气象局，西藏 察隅 860600
  • 出版日期:2014-04-28 发布日期:2014-04-28

Comparison of aerosol optical properties over source region of sand dust and its downwind region in the East Asia

ZHENG Yu-qi1  YU Xing-na2  XIANG Lei2  Dengzengrandeng3  Deqingyangzong4   

  1. 1. Qian’an Meteorology Service, Qian’an 131400, China; 2. School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China; 3. Lazi Meteorological Service, Lazi 858100, China; 4. Chayu Meteorological Service, Chayu 860600, China
  • Online:2014-04-28 Published:2014-04-28

PDF (PC)

119

被引次数

3

摘要：

利用AERONET观测资料从气候学的角度比较分析了2001—2011年东亚地区沙尘天气发生时沙尘源区和下游区大气气溶胶光学特性。结果表明：沙尘期间沙尘源区气溶胶光学厚度明显大于下游区，而Angstr?m波长指数却小于下游区，当沙尘暴出现时会降至零甚至负值。气溶胶粒子尺度体积谱分布除敦煌为单峰外，其余各站均呈双峰分布，香河和北京的细粒子浓度明显大于西北地区，这可能是由细的沙尘粒子和污染气溶胶共同造成。在440—1020 nm范围内，中国地区气溶胶单次散射反照率平均值为0.93，韩国和日本站分别为0.93和0.94。沙尘源区与下游区相比，复折射指数实部偏大，虚部偏小。总体来说，沙尘天气下东亚地区在4个波段内平均不对称因子为0.70。

关键词: 沙尘气溶胶, 远距离传输, 复折射指数

Abstract:

The aerosol optical properties were compared between source region of sand dust and its downwind region in the East Asia using the observational data from the AERONET site during 2001 to 2011. The results show that the aerosol optical depth is significantly higher over source regions than over its downwind regions during sand dust, while the reverse is true for the Angstr?m exponent and it decreases to zero or even negative when the dust storm appears. The volume spectrum distribution of aerosol particle size is a double peaks shape except in the Dunhuang site. The concentrations of fine particles are extremely higher in Xianghe and Beijing than in the Northwest area, which is caused by the fine particles together with   pollutant aerosols. The averages of aerosol single scattering albedo are 0.93, 0.93 and 0.94 from 440 nm to 1020 nm in China, Korea and Japan. Compared with that in the downwind regions, the real part of refractive index is higher and the imaginary part is lower in the source regions. In general, the average of asymmetry factors at the four wavelengths is 0.70 in the East Asia under sand dust weather condition.

Key words: Sand dust aerosol, Long-range transport, Refractive index