AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
New Particle Formation and Growth Events Observed under Clear-sky and Cloudy Conditions at Gosan Climate Observatory
SOON-CHANG YOON, Yumi Kim, Sang-Woo Kim, Seoul National University
Abstract Number: 568 Working Group: Aerosols, Clouds, and Climate
Abstract New particle formation and growth events at Gosan Climate Observatory (GCO), Jeju Island, south of the Korea Peninsula were analyzed according to cloud amount during May 2008 – April 2012. Two cases show possibility for occurrence of strong new particle formation and growth under low-level cloud (30 January 2012) and mid-level cloud (28 January 2012) conditions in spite of decrease of global down-welling shortwave radiation. In addition, new particle formation and growth events occurred under not only cloudy condition but also elevated dust layer at 20-21 March, 2012. For 4-year data seasonal occurrences of total new particle formation and growth events were 85 (spring), 31 (summer), 88 (fall), and 76 (winter) days out of a total 805 days. Only 13% of days for total events were observed under clear sky. 85% of strong event also observed under cloudy condition. The mean event start time was delayed according to increasing cloud amount. On average, formation rate of strong new particle formation and growth under between clear skies and cloudy conditions were similar. However, mean growth rate and condensation sink of strong events were decreased according to increasing cloud amount. Those imply that other factors (e.g., enough condensable gases, low condensation sink) rather than radiation are satisfied for occurred events at GCO.