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Surface Ocean and Lower Atmosphere Study—Air-Sea interactions and their climatic and environmental impacts
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Micro-spectroscopic characterization of particles generated from mesocosm and collected over South China Sea
P-C4-08
Bingbing Wang* , Xiamen University
Peter A. Alpert, Paul Scherrer Institute
Jiao Xue, Xiamen University
Peihong Kang, Xiamen University
Pablo Corral Arroyo, Paul Scherrer Institute
Jing Dou, ETH
Ulrich K. Krieger, ETH
Swarup China, Pacific Northwest National Laboratory
Markus Ammann, Paul Scherrer Institute
Kunshan Gao, Xiamen University
Presenter Email: Bingbing.Wang@xmu.edu.cn |
| Aerosol particles are often not a single compound residing the atmosphere, but rather a mixture of e.g. soot, organic and inorganic materials. The marine environment is one major source of atmospheric particles due to the direct emission of sea salts and biogenic/organic matter. A wealth of research in the recent years has been investigated the capability of these mixed organic/inorganic particles to act as cloud condensation and ice nuclei with implications for cloud formation and precipitation. During transport of airborne particles in the atmosphere, chemical and physical aging can alter their physicochemical properties. In turn, freshly emitted and aged particles may pose different environmental and climatic impacts. Here we present micro-spectroscopic characterization of particles collected during cruises over the South China Sea or generated by bubble busting during a mesocosm experiment. Two single particle techniques, scanning transmission X-ray microscopy coupled with near-edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS) and computer-controlled scanning electron microscopy coupled to energy dispersive X-ray analysis (CCSEM/EDX), were applied to hundreds of individual particles to obtain information on the particle elemental composition and spatially resolved mixing state at statistically significant level. The mixing state is a quantitative measure which is the number of particles having a single component or a combination of the components which are soot, organic and inorganic matter. These results will be discussed on cloud formation ability with a particular focus on the ice nucleation potential of these field and laboratory generated particles. |
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