TITLE: Dicarboxylic acids, fatty-acids and levoglucosan from Ronald H. Brown during ACE-Asia (Kawamura and Mochida) AUTHORS: Kimitaka Kawamura and Michihiro Mochida Insitute of Low Temperature Science Hokkaido University N19 W8, Kita-ku Sapporo 060-0819, JAPAN Phone: KK: +81-11-706-5457, MM: +81-11-706-5504 Fax: +81-11-706-7142 E-mail: kawamura@lowtem.hokudai.ac.jp, mochida@pop.lowtem.hokudai.ac.jp 1.0. DATA SET OVERVIEW: Aerosol sampling for major oxygenated organic compounds (dicarboxylic acids, fatty acids, and levoglucosan) was conducted from March 15 to April 19, 2001 on board of NOAA R/V Ronald H. Brown over the western North Pacific, East China Sea and the Sea of Japan, as part of the ACE-Asia campaign. During the cruise, aerosol particles were collected on quartz fiber filters using a high volume air sampler. 2.0 INSTRUMENT DESCRIPTION: Aerosol samples were collected on pre-combusted (450degC, 3-6 hrs) quartz fiber filters (20x25 cm, Pallflex 2500QAT-UP) in the high-volume sampler. To prevent any possible contamination from ship exhausts, the sampler was controlled by a wind sector/wind speed system that automatically shut off the sampling pumps at low wind speed (< 2.5 m s-1) or when air came from abaft the beam. Air was sampled for 0.5-1 day at a flow rate of 800 L min-1 (corresponding to a filter surface velocity of 33 cm s-1). The pumping time was 60 +/- 31 % of the sampling period on average with one standard deviation. 3.0 DATA COLLECTION AND PROCESSING: Analysis of DCAs was conducted by the method described in Kawamura and Ikushima [1993] with some modification. In this study samples were extracted with water (3 x 5 ml) to remove organic acids followed by ethyl acetate (3 x 5 ml) to extract FAs. The water extracts and ethyl acetate extracts were combined, concentrated to about 0.1 ml, and then spiked with 14 % BF3/n-butanol. The mixture was heated for 1h to esterify the carboxyl groups. The butyl ester derivatives were extracted with n-hexane, and then quantified using GC and GC/MS. The method for the analysis of levoglucosan is described in Kobayashi et al. (to be submitted). Briefly, levoglucosan was extracted from the samples with a methylene chloride/methanol 2:1 mixture. The samples were concentrated and sonicated with methylene chloride. Sugars in the solution were oximated with hydroxylamine in pyridine, and derivatized with 99% N,N - bis(trimethylsilyl)fluoroacetamide (BSTFA) + 1% trimethylchlorosilane (TMCS), and then quantified with GC and GC/MS. 4.0 DATA FORMAT: The data file is a tab-delimited ASCII file. DATA VERSION = 1.0 (30 Nov. 2002) Data in ng/m3 Parameters include: sample number, sampling start time, sampling end time, average lat., average long., CnDCA(n=2-9, saturated straight-chain dicarboxylic acids), LFA(sum of saturated C16+C18 fatty acids), HFA(sum of saturated C20-C32 fatty acids), and Levo(levoglucosan) 5.0 DATA REMARKS: Any questions or comments regarding this data set should be addressed to the authors listed at the top of this document. 6.0 REFERENCES: Kawamura, K., and K. Ikushima, Seasonal changes in the distribution of dicarboxylic acids in the urban atmosphere, Environ. Sci. Technol., 27, 2227-2235, 1993.