关键词: 塔中站, 沙尘气溶胶, 光学厚度, 能见度, 沙尘浓度

Abstract: Aerosol is the most uncertain factor in climate change study, and more observation and research worldwide pay much attention to its climate effect. Chinese meteorological administration builds China aerosol net (ChinaAeroNet), 20 observation sites over northern China in order to monitor the sand-dust storm and answer the climate effect of Asian aerosol. Tazhong observation station locates in the center of Taklimakan desert, the second largest desert in the world, which emits a lot of sand-dust and even produces heavy sand-dust storm in spring, resulting in severe disaster. Tazhong station offers a chance to monitor sand-dust in a near distance.This paper analyzed annual variability of aerosol optical thickness (AOT) based on Cimel sun photometer data and further made a correlation analysis among AOT, visibility, mass concentration. The result indicates that the 440 nm AOT in spring is bigger than that in the other seasons. The aerosol mass concentration(PM10) has a negative power-function relationship with visibility, so does the 440 nm AOT and visibility. Whereas, the 440 nm AOT has linear relationship with PM10, which means that an increase of sand-dust concentration will result in an increase of 440 nm AOT.

Key words: Tazhong station, sand-dust aerosol, optic thickness, visibility, sand-dust concentration