AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Characterization of Arctic Aerosol Particles during the Arctic Ocean Expedition in 2013
GIBAEK KIM, Young Jun Yoon, Hee-joo Cho, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 170 Working Group: Remote and Regional Atmospheric Aerosols
Abstract The Arctic region, isolated from anthropogenic sources, is one of the pristine places to study natural aerosol processes and evaluate various anthropogenic impacts on the atmosphere. The investigation of climate change in the Arctic may provide a decisive clue to predict climate change on a global scale. Atmospheric aerosols have an important role in the radiation balance and the formation of cloud condensation nuclei. However, they represent large uncertainties in their contribution to climate change. Therefore, it is necessary to determine the physicochemical properties of the Arctic aerosols.
Herein, differential mobility particle sizer (DMPS), hygroscopicity and volatility tandem differential mobility analyzer (HVTDMA), transmission electron microscopy/energy dispersive spectroscopy (TEM/EDS), and laser induced breakdown spectroscopy (LIBS) techniques were applied to characterize aerosol samples measured/collected at the Korean research icebreaker, ARAON, during the Arctic Ocean Expedition in 2013. The size distribution of aerosol particles ranging from 28 to 594 nano-meter was observed by DMPS. Furthermore, the hygroscopic and volatile properties were determined by using the HVTDMA technique under controlled RH (85 percent) and temperature (100 degree Celsius) conditions, respectively. Occasionally, the heating temperature was gradually elevated up to 250 degree Celsius for the investigation of existence of non-volatile core particles. In addition, morphological and elemental analyses, and multi-elemental analysis for occasionally collected PM$_(2.5) aerosol particles were performed by TEM/EDS and LIBS, respectively.
Atmospheric aerosol particles were classified into several groups based on their morphology and elemental composition. Several elements such as Mg, Ca, Na, and K were detected by LIBS, and their variations were investigated. Chlorophyll a concentrations observed from satellite data indicate that the biological activity was relatively intense around the cruise route. HVTDMA measurement data suggest that particulate organic matters were ubiquitous during the measurement period.