Data is representatine of oceanic sources /sinks from the SW Atlantic as well as continental Africa on occassion.
Measurement Method
NDIR
Current status and history of Instruments
NDIR
Description of Instruments
Hartmann & Braun
URAS4
Time Zone
UTC
Data Period
1993-01-01 - 2009-01-01
Data Type
hourly, daily, monthly
Parameter detail
Other Descriptions for Sampling and Analyses
Continuous sampling using a URAS 4 (NDIR) analyser.
The height of the air intake is 260 m above sea level from the top of a 30 m high mast.
Two freezing units (-4 and -45 °C respectively) are used in series to dry the ambient air prior to analysis. Since the beginning of 2000, an additional magnesium perchlorate filter was placed within the sampling line to create an effective dew point of -70 °C.
The data have been recorded at 2 min intervals from 1993 till mid-99 and mixing ratios stored as hourly means. From mid-99 onwards 1-min intervals are used to create half-hourly means. These in turn form the basis for daily and monthly means.
Scientific Aim
Observation of long-term CO2 trends in maritime air representative of the southern hemispheric mid-latitudes. Research related to baseline CO2 levels and deducing CO2 sources and sinks.
Supporting Contributor(s)
Last update
2010-02-12
Situation
ongoing
This site is maintained by the Japan Meteorological Agency
in cooperation with the World Meteorological Organization
(Created : 2001/07/02 Modified : 2010/07/31)
WMO World Data Centre for Greenhouse Gases
c/o Japan Meteorological Agency
1-3-4, Otemachi, Chiyoda-ku
Tokyo 100-8122, Japan
WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)
WDCGG leaflet (PDF 2.7MByte, July 2008)
