HR: 1340h
AN: A23C-0827    [Abstracts]
TI: Maritime-continental contrasts of cloud condensation nuclei in the west coast of the Korean peninsula
AU: * Song, K
EM: doitsky@atmos.yonsei.ac.kr
AF: Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul, 120-749 Korea, Republic of
AU: Hudson, J G
EM: hudson@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway , Reno, Nv 89512 United States
AU: Yum, S S
EM: ssyum@atmos.yonsei.ac.kr
AF: Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul, 120-749 Korea, Republic of
AU: Choi, B
EM: cbc@kma.go.kr
AF: Korea Meteorological Administration, 1764-6 Seungeon-Ri, Taean-Gun, Chungnam, 357-961 Korea, Republic of
AB: Measurements of cloud condensation nuclei (CCN) were made at the Korea Global Atmospheric Watch (GAW) Observatory (KGAWO) (36.32 \deg N, 126.19 \deg E) on the west coast of the Korean Peninsula, south of Seoul, from April 30 to May 22, 2004. This location - 500 km distance from China across the Yellow Sea - provides a unique opportunity to monitor the influence of east China's rapidly growing industrial and human activities as well as the local Korean pollution. CCN were measured with the two Desert Research Institute (DRI) instantaneous CCN spectrometers. Condensation Nuclei (CN) were also measured with a TSI 3010 counter. On some foggy days fog droplets (2 - 50 micrometer diameter) were measured with an FSSP-100. For the whole period air masses were divided into 10 maritime and 12 continental regimes according to Hybrid Single Particle Lagrangian Integrated Trajectory model (HYSPLIT4) results. Preliminary analyses showed that the average CCN concentration at 1$%$ supersaturation of the continental air masses was 6573 cm$^{-3}$, which almost doubled the maritime average concentration of 2758 cm$^{-3}$. Average total particle (i.e., CN) concentration was higher and showed similar contrast between the continental and maritime air masses (8594 cm$^{-3}$ vs. 4872 cm$^{-3}$). These concentrations were significantly higher than those measured in some other parts of the earth atmosphere. For example, CCN measurements in marine environment but with continental influences showed 1411 cm$^{-3}$ in Florida and 1023 cm$^{-3}$ in northeast Atlantic. These are even lower than the maritime CCN concentrations in this study. Therefore, maritime in this study is only in a relative sense. An Asian Dust (AD) event occurred on May 4. CN and CCN concentrations on this day, 10880 and 8835 cm$^{-3}$, respectably, were higher than the average continental concentrations. However, one non-AD day also showed as high concentrations. Much more detailed analyses and comparisons will be made and presented at the conference.
DE: 4801 Aerosols (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting