TemperateReefBase Geonetwork Catalogue
In-situ Halocarbon trace-gas concentrations measured by the Dirac GC-ECD during the SIPEX II voyage of the Aurora Australis, 2012
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 and H2). A cylinder of calibrated air is located within the instrument container to perform regular calibrations.
Inlet flow rate of 1 L/min; sampling rate - about 20 samples per day.
Method description: a sample volume of 20 ml is passed through the adsorbent tube which quantitatively traps the compounds of interest. The tube is mounted across a 6 port 2 position valco valve. The adsorbent bed is then purged with helium to remove oxygen and the valco valve is switched to the 'inject' position. The tube is heated to 180 C, releasing the compounds of interest into a carrier flow of helium onto the separation column. The column is heated first isothermally at 35 C for 5 minutes before heating at 8 C/min to 145 C. The target compounds are separated according to boiling point and pass through the ECD. The chromatogram takes ~30 minutes to complete. After the bromoform peak has appeared the column is cooled back to 35 C, the valco valve is switched to the 'load' position and the next sample can be injected.
Simple
Identification info
- Alternate title
- In-situ Halocarbon trace-gas concentrations measured by the Dirac GC-ECD during the SIPEX II voyage of the Aurora Australis, 2012
- Date (Publication)
- 2014-09-01
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.4225/15/53266BB82B3A3
Originator
Publisher
Principal investigator
Principal investigator
Principal investigator
Principal investigator
Principal investigator
Principal investigator
Principal investigator
Collaborator
Collaborator
Collaborator
Collaborator
Collaborator
Collaborator
Collaborator
- Name
- CAASM Metadata
- Status
- Completed
Custodian
- Topic category
-
- Oceans
- Climatology, meteorology, atmosphere
Extent
))
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2012-09-14 2012-11-05
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > HALOCARBONS
- Keywords
-
- Halocarbons
- NASA/GCMD Earth Science Keywords
-
- EGC > Electron Gas Chromatograph
- GAS CHROMATOGRAPHS
- NASA/GCMD Earth Science Keywords
-
- R/V AA > R/V Aurora Australis
- NASA/GCMD Earth Science Keywords
-
- AMD
- AMD/AU
- CEOS
- ACE/CRC
- NASA/GCMD Earth Science Keywords
-
- OCEAN > SOUTHERN OCEAN
- CONTINENT > ANTARCTICA
- GEOGRAPHIC REGION > POLAR
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- These data are not yet publicly available.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIPEX_II_Halocarbons when using these data.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2014-09-01T00:00:00
- Units of distribution
- MB
- Transfer size
- 49.9
- Distribution format
-
- csv, text
- OnLine resource
-
GET DATA
Download point for the data
- OnLine resource
-
PROJECT HOME PAGE
Public information for ASAC project 4032
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset
Resource lineage
- 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.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2013-05-13 - record created by Dave Connell from a template completed by Robyn Schofield. 2013-05-21 - record updated by Dave Connell at the request of Robyn Schofield. 2014-03-17 - record updated by Dave Connell to add a data set DOI. 2015-10-28 - record updated by Dave Connell to alter the order of personnel.
Metadata
- Metadata identifier
- string/SIPEX_II_Halocarbons
- Language
- English
- Character encoding
- UTF8
Author
Sponsor
Owner
- Title
- Parent Metadata Record
- Citation identifier
- SIPEX_II
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- c6731a47-2dbe-4c02-a176-4580c294c3cc
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2015-11-30T07:47:42
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/SIPEX_II_Halocarbons
Point of truth for the metadata record
- Date info (Creation)
- 2013-05-13T00:00:00
- Date info (Last Update)
- 2017-04-26
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile
Overviews
Spatial extent
Provided by
