Chang Hoon Jung, Kyungin Womens College, Incheon, Korea, Republic of (South), Y.J. Yoon, Korea Polar Research Institute, Incheon, South Korea, Junshik Um, Pusan National University, Department of atmospheric sciences, Busan, Korea, Republic of (South), JiYi Lee, Ewha Womans University, Environmental Science and Engineering, Seoul, South Korea and Yong Pyo Kim, Ewha Womans University, Department of Chemical Engineering and Materials Science, Seoul, South Korea