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Mt. Waliguan - CMA
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| Category |
Air sampling observation |
| Sampling Type |
continuous |
| Sampling Height/Depth |
80 |
| Sampling and Analysis Frequency |
NDIR system, ambient analysis frequency of one per minute.
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| Sampling Environment |
MT. Waliguan is located in a drought temperate climatic zone surrounded primarily with low grasslands and mountainous regions. The large-scale anthropogenic emission and transport from the Yellow River Canyon industrial area in north-eastern region approximately 500 km away from Waliguan may affect CO2 level. The process of plants respiration in summer is primary sink of CO2. |
| Measurement Method |
NDIR |
| Current status and history of Instruments |
November 1994- present, Licor6251, Li-Cor. Inc. |
| Description of Instruments |
Range: 0 to 1000 ppm.
Sensitivity: The minimum detectable mole fraction is 0.2 ppm for a 0-1000 ppm span.
Precision: approximately 0.05percent of span.
Accuracy: approximately 0.07 percent of span after calibration.
Zero drift: (maximum) 10% in 8 hours
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| Time Zone |
Local time (UTC+8) |
| Data Period |
1994-01-01 - 2008-12-31 |
| Data Type |
daily, monthly |
| Parameter detail |
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| Other Descriptions for Sampling and Analyses |
Atmospheric CO2 is measured using a Licor6251 non-dispersive infrared (NDIR) analyzer. Ambient air is supplied via 3/8 o.d. Dekobon tubing extending 80 m up the tower, approximately 5 m away from the laboratory. Air is drawn in via vacuum pumps through pressure release valves set at 15 psi to remove excess air and allow high continuous flow through the main line (a Cole-Parmet Air Cadet model 7530-50 Pump), sample flow 100 ml/min, and passes through a 7μmin-line filter to remove particulate matter. The ambient air residence time from the top of the tower to the NDIR analyzer is about 30 s. The air flow then passes through glass traps submerged in methanol cryocoolers set at -52°C (two series glass traps) to remove residual moisture. |
| Scientific Aim |
To determine the global distribution and temporal variations of atmospheric CO2, to deduce CO2 sources and sinks
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| Supporting Contributor(s) |
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| Last update |
2009-10-14 |
| Situation |
ongoing |
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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 : 2010/09/02)
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WMO World Data Centre for Greenhouse Gases
c/o Japan Meteorological Agency
1-3-4, Otemachi, Chiyoda-ku
Tokyo 100-8122, Japan
| Tel: |
+81-3-3287-3439 |
| Fax: |
+81-3-3211-4640 |
| E-mail: |
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WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)
WDCGG leaflet (PDF 2.7MByte, July 2008)