Readme file for the final hydrocarbon dataset, Blodgett Forest 1997, ponderosa pine plantation hcfin97.txt by Mark Lamanna and Allen Goldstein University of California at Berkeley Department of Environmental Science, Policy and Management Ecosystem Science Division 250 Hilgard Hall Berkeley, CA 94720-3110 ph.: 1-510-643-6449 Fax: 1-510-643-5098 e-mail: ahg@nature.Berkeley.edu ---------------------- General description: This dataset contains over 20 compounds, analyzed during summer 1997 at the Goldstein group Blodgett Forest research tower site. The site is described in Lamanna and Goldstein [JGR, 1999], and Goldstein et al. [Agr. For. Meteorol., 2000]. Measurements have been performed on an hourly basis with only little downtime. The principles of the hydrocarbon instrument are described in Lamanna and Goldstein [JGR, 1999]. Mixing ratios were measured above the ponderosa pine plantation. All identification has been carried out by retention time and is therefore not 100% conclusive. ** All chromatograms have been integrated manually for proper identification and quantification. Human error, however, is unavoidable. ** ** Zero mixing ratios were not set "NA". ** ------ Individual compounds are listed by column in the header. Time is local standard time (PST) in Day of Year format. Concentrations are given in ppbv. -------- Standards (manufacturer's accuracy in parenthesis): S1 (Scott-Marrin): acetaldehyde (+-5%), MACR (+-10%), heptane (+-2%), alpha-pinene (+-2%), acetone (+-2%), isoprene (+-2%) balance: nitrogen S2 (Scott-Marrin): heptane, 3-carene, alpha-pinene, d-limonene (unanalyzed Standard; alpha-pinene and heptane are consistent with S1). balance: nitrogen MBO (Scott-Marrin): 2-methyl-3-buten-2-ol (+-2%) balance: nitrogen OVOC (Scott-Marrin; mixing ratios assigned by NCAR and highly uncertain for the aldehydes and alcohols): butane, isoprene, acetaldehyde, acetone, butanal, MACR, MEK, methanol, benzene, ethanol, pentanal, 2-pentanone, hexanal, n-butanol balance: nitrogen Scotty (Scott Specialty Gases small tank): benzene, toluene, ethylbenzene, p-, m-, and o-xylene (all +-10%) balance: nitrogen -------- References: In-situ measurements of C2-C10 VOCs and OVOCs above a Sierra Nevada Ponderosa Pine Plantation, Mark S. Lammana and Allen H. Goldstein, Journal of Geophysical Research - Atmospheres, 104, 21247-21262, 1999 Effects of climate variability on the carbon dioxide, water, and sensible heat fluxes above a ponderosa pine plantation in the Sierra Nevada (CA), A.H. Goldstein, N.E. Hultman, J.M. Frachebaud, M.R. Bauer, J.A. Panek, M. Xu, A. Guenther, and W. Baugh, Agricultural and Forest Meteorology, 101, 113-129, 2000