Title: ACE-Asia Database_Gosan LowVol_1.4 This database includes the TSP, PM2.5, and PM1.0 mass, elemental carbon, and organic carbon concentrations collected from sampling at the Gosan Supersite (33.17E, 126.10N) located on Jeju Island, South Korea during March 31 to May 3, 2001 as part the ACE-Asia Experiment. The times and dates included in this database are UTC. Please direct any questions about the data to: Rachelle Duvall Water Science and Engineering Laboratory RM 152 660 N. Park Street Madison, WI 53706 (608) 262-4322 (office) (608) 262-0454 (fax) Email Address: rmduvall@students.wisc.edu Samples were collected each day for 24-hrs using a Low Volume Sampler (University of Wisconsin-Madison). Mass was measured at a Temperature of 70 C (68-73) and Rh of 38 %RH (30-40%). ECOC was measured by the ACE-Asia ECOC method based on NIOSH 5040. Columns 1 and 2 of the data set contain the start and stop sampling times in UTC for the corresponding sample number. Column 6 lists the type of sample (either TSP, PM2.5, or PM1.0) that correspond to the sample number. Invalid data (ID) represents data where a filter was torn or wet due to rain events. The mass uncertainty was calculated using the following formula: SQRT (STDev Initial weight^2+ STDev Final Weight ^2). A 5% uncertainty was accounted for in the mass measurement resulting from uncertainty in the sampler airflow rate measurements. Uncertainties for elemental and organic carbon were reported by instrumental analysis. In comparing our elemental carbon concentrations to that obtained by collaborators on the ACE-Asia project, we found that our EC concentrations were slightly higher. Therefore, we added an additional 5% uncertainty to the EC uncertainty to account for those concentration differences. Rachelle Duvall Revised April 2, 2003