Seong Soo Yum

More than 15 h of in situ cloud measurements in Atlantic and Pacific stratus showed cloud droplet concentrations to be correlated with cloud condensation nuclei (CCN) concentrations measured just below cloud. Predictions of droplet concentrations based on complete CCN spectra and measured updraft velocities were better correlated with measured cloud droplet concentrations. This was especially significant for near-adiabatic parcels because these results represent a good level of closure between C

More than 23 hours of continuous condensation nuclei (CN) and cloud condensation nuclei (CCN) spectral data from the Arctic Clouds Experiment are presented and analyzed. These measurements were made at altitudes ranging from 6 km to 30 m in eight flights during May 1998 over the mostly frozen Arctic Ocean at least 500 km north of the Alaskan coast. Concentrations generally increased with altitude with a pronounced deficit in the boundary layer when low stratus clouds were present. The low‐level

Abstract Cloud microphysical data obtained from G‐1 aircraft flights over the southeastern Pacific during the Variability of the American Monsoon Systems Ocean‐Cloud‐Atmosphere‐Land Study Regional Experiment field campaign were analyzed for evidence of entrainment mixing of dry air from above cloud top. Mixing diagram analysis was made for the horizontal flight data recorded at 1 Hz and 40 Hz. The dominant observed feature, a positive relationship between cloud droplet mean volume ( V ) and liqu

More than 15 h of in situ cloud measurements in Atlantic and Pacific stratus showed cloud droplet concentrations to be correlated with cloud condensation nuclei (CCN) concentrations measured just below cloud. Predictions of droplet concentrations based on complete CCN spectra and measured updraft velocities were better correlated with measured cloud droplet concentrations. This was especially significant for near-adiabatic parcels because these results represent a good level of closure between C

Submicron aerosol size distributions, CN and CCN concentrations at a constant supersaturation of 0.6% were measured at a relatively remote coastal site at Gosan in Jeju Island, Korea, during the ABC‐EAREX from 11 March to 8 April 2005. The average CN concentrations were 6088 ± 3988, 5231 ± 2454 and 3513 ± 1790 cm −3 , respectively, for the three major air mass types classified by their origins. The corresponding CCN concentrations were 2393 ± 1156, 2897 ± 1226 and 1843 ± 585 cm −3 . The type III

In spite of the many factors that determine cloud droplet concentrations, relationships were found between cloud condensation nuclei (CCN) and cloud droplet concentrations for the First Aerosol Characterization Experiment (ACE 1). Measurements were made in summertime stratocumulus clouds over the Southern Ocean far from anthropogenic sources. The closest relationship of CCN and droplet concentrations was found for CCN measured just below near‐adiabatic cloud parcels. Moreover, an adiabatic dropl

Wintertime/summertime contrasts of cloud condensation nuclei (CCN) and cloud microphysics observed in clean maritime environments off the west coast of Tasmania, Australia in the Southern Ocean Cloud Experiment, are presented. The average wintertime CCN concentration (N CCN ) was 32 cm −3 at 1% supersaturation (S), but it was 19 cm −3 when only baseline (maritime airflow with minimal anthropogenic influences) flights were considered. In contrast, the average summertime N CCN were more than a fac

Cloud condensation nuclei (CCN) measurements were made with the Desert Research Institute (DRI) instantaneous CCN spectrometer at the Korea Global Atmosphere Watch (GAW) Observatory (KGAWO) (36°32′N, 126°19′E) on the west coast of the Korean Peninsula from May 1–22, 2004. A TSI CPC3010 counter simultaneously measured condensation nuclei (CN). For seven of these days, submicron aerosol size distributions were also measured with an SMPS. Data were classified maritime or continental according to ai

The effects of increased dimethyl-sulfide (DMS) emissions due to increased marine phytoplankton activity are examined using an atmosphere-ocean coupled climate model. As the DMS emission flux from the ocean increases globally, large-scale cooling occurs due to the DMS-cloud condensation nuclei (CCN)-cloud albedo interactions. This cooling increases as DMS emissions are further increased, with the most pronounced effect occurring over the Arctic, which is likely associated with a change in sea-ic

Abstract This study examines the vertical variations of cloud microphysical relationships and their implications to cloud microphysical processes in marine stratocumulus clouds using in‐situ aircraft observations during the Aerosol and Cloud Experiments in Eastern North Atlantic (ACE‐ENA) field campaign. A new diagram with a coordinate system based on cloud droplet liquid water content (L c ) and phase relaxation time scale is proposed to investigate mixing mechanisms. This new diagram analysis

Improvement of fog simulation accuracy was investigated for the fogs that occurred on the south coast of the Korean Peninsula using the WRF (3D) and PAFOG (1D) coupled model. In total, 22 fog cases were simulated and accuracy of the fog simulation was examined based on Critical Success Index, Hit Rate and False Alarm Rate. The performance of the coupled WRF-PAFOG model was better than that of the single WRF model as expected. However, much more significant improvement appeared only when the data