TITLE: C130 Soluble Ion, Weber PILS-IC AUTHOR(S): Rodney J. Weber, Kari L. Maxwell, Douglas A. Orsini Georgia Institute of Technology School of Earth and Atmospheric Sciences 221 Bobby Dodd Way Atlanta, GA, 30332 (404) 894-1750 fax: (404) 895-5638 rweber@eas.gatech.edu 1.0 DATA SET OVERVIEW: Airborne measurements of soluble aerosol particles were made from March 30 to May 4, 2001 using a particles-into-liquid-sampler (PILS). 124-145 LON, 23-43LAT 2.0 INSTRUMENT DESCRIPTION: The PILS was developed for rapid automated on-line and continuous measurement of ambient aerosol bulk composition. (1) Technique involves mixing ambient air with saturated water vapor to grow particles for collection via inertial impaction. Collected liquid sample with dissolved aerosol species is measured online by ion chromatography. Samples were taken approximately every 4 minutes. Upper measurement particle size range is currently being determined, estimated to be 3um diameter. Measurement uncertainty is approximately +/- 30%. 3.0 DATA COLLECTION AND PROCESSING: Chromatograph automated to collect and inject at 4 minute intervals. Once collected, a LABVIEW program was used to sort by species collected. Timestamps were altered to account for the time lag to sample loop and fill time so that the stamp is the center of the sample. Mixing ratios calculated by using T and P averaged over the sample time. (sample time +/- 00:01:42 for a total of 3min, 24 sec) IC Flows were carefully monitored to prevent change. Species were calibrated for before and 3 times during mission to keep flights comparable. Aqueous Fisher standards were used. Detection Limits were measured as 3 times standard deviation of baseline noise Sodium 20ng/m3 Ammonium 20ng/m3 Calcium 20ng/m3 Magnesium 15ng/m3 Potassium 20ng/m3 Chloride 5ng/m3 Nitrate 10ng/m3 Sulfate 10ng/m3 4.0 DATA FORMAT: Data File is tab delimited text file: PARAMETERS: Flight Flight number Mm/dd/yyyy date for sample t-mid stamp (UTC) t-st start time for sample (UTC) t-sp stop time for sample (UTC) t-mid midpoint for sample (UTC) Sample Time Stamp Julian,t-mid Julian Day based on midpoint of sample (UTC) ALT-mid Altitude for center of sample (m) LON-mid Longitude for center of sample (degs) LAT-mid Latitude for center of sample Na++ug/stdm3 Soluble Sodium Ion Concentration (Standard ug/m3) NH4+ug/stdm3 Soluble Ammonium Ion Concentration (Standard ug/m3) Ca++ug/stdm3 Soluble Calcium Ion Concentration (Standard ug/m3) Mg++ug/stdm3 Soluble Magnesium Ion Concentration (Standard ug/m3) K+ug/stdm3 Soluble Potassium Ion Concentration (Standard ug/m3) Cl-ug/stdm3 Soluble Chloride Ion Concentration (Standard ug/m3) NO3-ug/stdm3 Soluble Nitrate Ion Concentration (Standard ug/m3) SO4=3Dug/stdm3 Soluble Sulfate Ion Concentration (Standard ug/m3) Na++ppt Soluble Sodium Ion Concentration (ppt) NH4+ppt Soluble Ammonium Ion Concentration (ppt) Ca++ppt Soluble Calcium Ion Concentration (ppt) Mg++ppt Soluble Magnesium Ion Concentration (ppt) K+ppt Soluble Potassium Ion Concentration (ppt) Cl-ppt Soluble Chloride Ion Concentration (ppt) NO3-ppt Soluble Nitrate Ion Concentration (ppt) SO4=3Dppt Soluble Sulfate Ion Concentration (ppt) Data Version #1 11/27/2001 -888 below detection limit -999 unavailable data, removed No Data for flights 2,3,19 5.0 DATA REMARKS: During periods of liquid water sampling (in-cloud) the accuracy of the data is uncertain due to artifacts associated with droplet shatter. Standard conditions used are 1 atm and 298K for calculating standard m3 No soluble organics were measured or accounted for in this data set. No Data for flights 2,3,19 6.0 REFERENCES: 1. Weber, R.J, D. Orsini, Y. Duan, Y.-N. Lee, P. J. Klotz, and F. Brechtel (2001). A Particle-into-Liquid Collector for Rapid Measurement of Aerosol Bulk Chemical Composition, Aerosol Science and Technology 35: 718-727.