厦门大学海洋与地球学院

College of Ocean and Earth Sciences
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Luncheon Seminar #86 | The Role of the Ocean as a Source of Airborne Organic Matter and Its Impact on Cloud Formation
2017/11/15 300 返回上页
2017-11-20 (星期一) 11:40-1:00pm (Seminar starts at 12:00pm)
Daniel A. Knopf,Professor
Multi-function Hall, 1st Floor

【来访单位 Institution】:Stony Brook University  

【邀请人 Host】:Bingbing Wang      【联络人 Contact】:Jie LiuSpeaker: Dr. Daniel A. Knopf

Professor, School of Marine and Atmospheric Sciences, Stony Brook University
2003 Ph.D., Swiss Federal Institute of Technology (ETH), Inst. for Atmospheric and Climate Science, Switzerland

Sea spray is a major source of atmospheric aerosol mass over much of the earth’s surface. Knowledge of its composition and cloud formation propensity are critical for determining its role in atmospheric chemistry and climate. In absence of other airborne ice nucleating particles such as mineral dust, sea spray aerosol (SSA) may contribute significantly to atmospheric ice cloud formation. Only recently it has been recognized that SSA is associated with organic matter. SSA particles collected in the field and from laboratory mesocosm experiments are physicochemically characterized using, e.g., scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS). These analyses reveal that SSA consist of an inorganic core coated with biogenic material. NEXAFS spectra and spectrophotometric methods based on staining support the presence of polysaccharidic and proteinaceous material stemming from phytoplankton exudate. This exudate material can induce ice formation at tropospheric relevant conditions, providing a link between marine biological activity and cloud formation, thus climate. However, the nature of this marine biogenic material and its physicochemical properties resulting in observed ice nucleating propensities are not well understood and will be discussed in this seminar. 

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* 11:40开始提供简易午餐,12:00开始讲座。老师同学们取餐后请直接到A3-206会议室用餐,等待聆听报告(可以边吃边听)。

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