In-situ Halocarbon trace-gas concentrations measured by the Dirac GC-ECD during the SIPEX II voyage of the Aurora Australis, 2012

• Other Authors: AADC (owner), AADC, DATA OFFICER (distributor), AADC, DATA OFFICER (custodian), AU/AADC > Australian Antarctic Data Centre, Australia (hasAssociationWith), Australian Antarctic Data Centre (publisher), Australian Antarctic Division (sponsor), HARRIS, NEIL (hasPrincipalInvestigator), HARRIS, NEIL (collaborator), HUMPHRIES, RUHI (hasPrincipalInvestigator), HUMPHRIES, RUHI (collaborator), JOHNSTON, PAUL (hasPrincipalInvestigator), JOHNSTON, PAUL (collaborator), KREHER, KARIN (hasPrincipalInvestigator), KREHER, KARIN (collaborator), ROBINSON, ANDREW D (hasPrincipalInvestigator), ROBINSON, ANDREW D (collaborator), Robinson, A., Harris, N., Humphries, R., Kreher, K., Johnston, P., Thomas, A., and Schofield, R. (originator), SCHOFIELD, ROBYN (hasPrincipalInvestigator), SCHOFIELD, ROBYN (author), SCHOFIELD, ROBYN (collaborator), THOMAS, ALAN (hasPrincipalInvestigator), THOMAS, ALAN (collaborator)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; climatologyMeteorologyAtmosphere; EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > HALOCARBONS; EGC > Electron Gas Chromatograph; GAS CHROMATOGRAPHS; R/V AA > R/V Aurora Australis; AMD; AMD/AU; CEOS; ACE/CRC; OCEAN > SOUTHERN OCEAN; CONTINENT > ANTARCTICA; GEOGRAPHIC REGION > POLAR; Antarc*; Antarctica; aurora australis; Southern Ocean
• Online Access: https://researchdata.edu.au/in-situ-halocarbon-australis-2012/2821203

Progress Code: completed Statement: Methods were updated on the following dates: - 117 installed - increased column temperatures necessary for cold room temperature to elute more of the end products. - 118 installed - further increases to column temperatures necessary for cold room temperature to elute more of the end products. - 119 installed 5 October to deal with low N2 flow pressure and high baseline. A power outage on the 28th September caused data loss and dramatically increased baseline values which recovered very slowly. The spectra may sometimes be contaminated slightly with species sampled from the ship's exhaust. This corresponds to wind directions in the first quadrant of apparent wind direction. The current data set contains in-situ halocarbon atmospheric measurements of CH3CCl3, CH2Br2, CHBr3, CHCl3, C2Cl4 made using a Gas Chromatograph - Electron Capture Detector (GC-ECD) known as the micro- DIRAC. Instrument description and setup details: GC-ECD Instrument Description: "micro-Dirac: an autonomous instrument for halocarbon measurements" B. Gostlow, A. D. Robinson, N. R. P. Harris, L. M. O'Brien, D. E. Oram, G. P. Mills, H. M. Newton, S. E. Yong, and J. A Pyle Atmos. Meas. Tech., 3, 507-521, 2010 Instrument Setup: This instrument is sampling from a weather protected inlet positioned ~2 m off the front port side of the Monkey Deck of the Aurora Australis, directly above the bridge. The end of the Teflon sample line is bare (with an inserted glass wool filter) and contained within the "Ned Kelly", a large (~30 cm diameter) stainless steel can which protects against rain, snow, sea spray and major impacts. The quarter inch teflon sample line runs 60m (2 x 30m with 1 join) down to the GC-ECD which was located in a modified shipping container located on the foredeck. Ultra high purity He (99.995% purity) and N2 (99.998% purity) were fed ~ 6m into the instrument container via stainless steel 1/16" tubing from a smaller adjacent container containing a number of other gas cylinders (primarily He, N2 ...