| |
| |
|
|
|
|
| |
 |
Surface Ocean and Lower Atmosphere Study—Air-Sea interactions and their climatic and environmental impacts
|
| |
|
|
Heterogeneous ice nucleation and micro-spectroscopic characterization of particles generated from mesocosm
P-C4-11-S
Jiao Xue* , Xiamen University, Xiamen, China
Peter Alpert, Paul Scherrer Institute, Villigen, Switzerland
Swarup China, Pacific Northwest National Laboratory, Richland, USA
Peihong Kang, Xiamen University, Xiamen, China
Jing Li, Xiamen University, Xiamen, China
Xin Lin, Xiamen University, Xiamen, China
Xin Liu, Xiamen University, Xiamen, China
Kunshan Gao, Xiamen University, Xiamen, China
Tiantian Tang, Xiamen University, Xiamen, China
Bingbing Wang, Xiamen University, Xiamen, China
Presenter Email: jiaoxue@stu.xmu.edu.cn |
| Sea spray aerosol (SSA), which is a mixture of organic and inorganic materials such as sea salts and phytoplankton cell exudates, is one of the major contributors to atmospheric particles. These aerosol particles emitted to atmosphere and undergoing atmospheric aging may affect the formation, precipitation and lifetime of clouds. Here, we present heterogeneous ice nucleation and micro-spectroscopic characterization for particles generated by bubble busting during a mesocosm experiment. In this mesocosm experiment, chlorophyll-a (Chl a) concentration during phytoplankton bloom is similar to natural conditions. We observed heterogeneous ice nucleation including deposition mode and immersion freezing on particles using optical microscopy coupled with ice nucleation setup. Ice nucleating particles (INPs) were identified. Two micro-spectroscopic 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 individual particles to obtain information on the particle elemental composition and spatially resolved mixing state at statistically significant level. We find that SSAs collected from this mesocosm experiment, nucleate ice effectively. These results suggest that SSAs associated with sea salts and organics have the potential to affect the formation of ice crystals in the atmosphere. |
|
|
|
|
|
|
|
|