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WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)

WDCGG leaflet (PDF 2.7MByte, July 2008)

Cape Point - SAWS
Parameter Inventory Parameter Metadata Station Contributor
CH4 ** *
continuous		 CO *
continuous		 CO2 ** *
continuous		 N2O ** *
continuous		 O3 *
continuous
Observation Processing/Calibration Contact Person Reference Data/Quick Plot
Category Air sampling observation
Sampling Type continuous
Sampling Height/Depth 30
Sampling and Analysis Frequency every 15 minutes
Sampling Environment
Measurement Method Gas Chromatography (ECD)
Current status and history of Instruments SHIMADZU GC-ECD (up to end 2006)
HP 5890 (equipped with back flush technique) from Jan 2007
Description of Instruments
Time Zone UTC
Data Period 1994-01-01 - 2007-01-01
Data Type hourly, daily, monthly
Parameter detail
Other Descriptions for Sampling and Analyses Two freezing units (-4 and -45 °C respectively) are used in series to dry the ambient air prior to analysis. Sampling is continuous, using a gas chromatograph (GC) with and Electron Capture Detector (ECD). The oven temperature is approximately 40 °C and the ECD temperature 355 oC.
The primary column is a 1/8" x 3 m stainless steel, packed with Porapak N, 80/100 mesh, whilst a pre-column (1/4" x 20 cm s/steel packed with sodium asbestos) is used to extract any CO2. N2 (5.0) is used as carrier gas and the sampling loop (s/steel, 2 mm OD x 2.2 m) has a volume of 7 ml.
The data have been recorded at 15 min intervals (96 samples per day) and mixing ratios stored as hourly means (1994 until 2002). From mid-99 onwards, the 15-min intervals have been used to create half-hourly means. These in turn form the basis for the daily and monthly averages.

The height of the air intake is 260 m above sea level from the top of a 30 m high mast.

Scientific Aim Observation of long-term N2O trends in maritime air representative of the Southern Hemispheric mid-latitudes. Research related to baseline N2O levels and deducing N2O sources and sinks.
Supporting Contributor(s)
Last update 2010-02-12
Situation ongoing

Category Parameter Country/Territory Contributor
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This site is maintained by the Japan Meteorological Agency
in cooperation with the World Meteorological Organization
(Created : 2001/07/02    Modified : 2010/07/31)
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