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WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)

WDCGG leaflet (PDF 2.7MByte, July 2008)

Arrival Heights - NIWA

Parameter Inventory Parameter Metadata Station Contributor
13CH4 *
flask
CH4 *
flask
CO *
flask
N2O *
flask
VOCs
flask
Observation Processing/Calibration Contact Person Reference Data/Quick Plot
Category Air sampling observation
Sampling Type flask
Sampling Height/Depth 5
Sampling and Analysis Frequency 12-18 per year
Sampling Environment The samples are collected when the wind is coming from a direction other than from Scott Base or McMurdo station.
Measurement Method Mass Spectrometry
Current status and history of Instruments Dual Inlet Isotope Ratio Mass Spectrometry with small volume inlet.
1991-1996 Nuclide Analysis Associates 6-60 Mass Spectrometer
1996-present Finnigan MAT252
Description of Instruments All samples are analysed at the NIWA laboratory in Wellington, New Zealand.

Nuclide Analysis Associates 6-60 Mass Spectrometer
1991-1996 combined uncertainties for extraction of sample and measurement = 0.05 per mille
10 determinations of sample vs reference
Reference voltage set vs sample

Finnigan MAT 252
Absolute sensitivity 1200-3000 molecules per ion
1996-1999 combined uncertainties for extraction of sample and measurement = 0.05 per mille
3 sets of 10 determinations of sample vs reference
Reference voltage set vs sample

1999-present combined uncertainties for extraction of sample and measurement = 0.02 per mille
3 sets of 10 determinations of sample vs reference
Reference voltage set vs sample
Time Zone Local time (UTC+12)
Data Period 1992-03-19 - 2015-12-29
Data Type event
Parameter detail
Other Descriptions for Sampling and Analyses Dry whole air samples are collected in 30 L high pressure aluminium tanks. Air is sampled through a 10 m long 12.5 mm o.d. Dekabon tube attached to the Met mast. The air is pumped from the mast to the tanks using a RIX 5A-3E sweet air compressor and dried using a 1 L stainless steel trap containing 3 mm 13X molecular sieve pellets.
The tanks are pumped to 50 Bar.

All samples are analysed in the NIWA laboratory at Greta Point, Wellington, New Zealand.
Scientific Aim To provide data for research and study to reveal long term trends.
Supporting Contributor(s) NIWA
Last update 2017-08-01
Situation ongoing

Category Parameter Country/Territory Contributor
  Updated in
the last 365 days

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in cooperation with the World Meteorological Organization
(Created : 2001/07/02    Updated : 2017/12/05)

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