39 1001 Gandrud, Bruce National Center for Atmospheric Research ER-2 Multi-Filter Sampler AAOE 1987 1 1 1987 9 21 1989 5 9 0.0 Seconds from 00 Z, start filter collection 10 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 99999.0 99.0 9.99 9.99 9.99 9.0 9.99 9.0 9.999 9.0 Seconds from 00 Z, stop filter collection Filter number Total NO3 concentration (ppbv) Particulate NO3 as fraction of total NO3 SO4 concentration (ppbm) SO4 descriptor flag Total Cl concentration (ppbv) Cl descriptor flag Total F concentration (pptv) F descriptor flag 0 15 ============================================================================ This file is a reformatted version of the original AAOE data, such that it conforms to the exchange file format standards adopted for AASE II. RDATE is unknown so it has been set to the production date of the AAOE CD-ROM. The data descriptor flags are used to indicate whether the recorded data values are considered correct (1), or if the values are only known to be less than the recorded value (-1). A data value of zero indicates the measurement is below detection limits. (S.E.G.) ============================================================================ The concentrations are by volume except sulfate which is in parts per billion by mass. The particulate nitrate is listed as the fraction of the total that is in the particle phase. Start Stop NO3 SO4 Cl F 49260 51496 6 1.36 9.99 0.62 1 9.99 1 9.999 1 51620 54618 7 4.45 0.07 0.75 1 0.28 1 0.076 1 54800 57796 9 5.75 0.06 0.37 1 0.20 -1 0.119 1 57982 59790 11 5.65 0.06 0.14 1 0.40 -1 0.137 1 62184 65176 12 4.27 0.02 0.16 1 1.07 1 0.206 1 65420 68656 14 3.72 0.02 0.33 1 0.91 1 0.179 1 68840 71236 16 1.84 0.02 0.16 1 1.36 1 0.186 1