PI: Dr. Robert Wood, University of Washington, Seattle Field Operation in-charge: Dr. Duli Chand, University of Washington, Seattle (Now at CIRA, Colorado State University, Fort Collins) For any use, query or data concern, contact Dr. Rob Wood or Duli Chand; emails: robwood@atmos.washington.edu; duli@u.washington.edu; chand@cira.colostate.edu Data collected at Paposo upper site (25o 0.4’ S, 70o 27.01’ W, 690 masl) on the Chilean coast as part of the VOCALS Regional Experiment (REx). Period of observations Oct 17 to Nov 15, 2008 All times mentioned heer are UT NaN 'not a number' is a void data point flt_num = flight number samp_vol =sample volume (m3 of air through filter) totmas = net gravimetric mass of aerosol on filter mas_con = mass concentration (micrograms per cubic meter) form_con = formic acid mass concentration cl_con = chloride mass concentration nit_con = nitrate concentration succ_con = succinate concentration sulf_con = sulfate concentration oxal_con = oxalate concentration spec_con = the sum of the speciated concentrations an_mas_r = the ratio of speciated to total mass concentration (spec_con/mas_con) unk_mas = the unknown or unspeciated mass concentration (mas_con - spec_con). More details on the data can be found at the following reference and its final version in ACP Atmos. Chem. Phys. Discuss., 10, 17853-17887, 2010 www.atmos-chem-phys-discuss.net/10/17853/2010/ doi:10.5194/acpd-10-17853-2010