Title: ACE-Asia Database_Dunhuang HiVol_1.2 This database includes TSP mass concentrations collected from sampling at the Dunhuang, China (40.20N, 94.48E, Elevation of 1374m) during March 24 to April 4, 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 TSP samples were collected each day for 24-hrs using a High Volume Sampler (Andersen Instruments). TSP Mass was measured at a Temperature of 70 C (68-73) and Rh of 38 %RH (30-40%). Columns 1 and 2 contain the start and stop sampling times in UTC for the corresponding sample number. 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. Rachelle Duvall Last Revised April 2, 2003