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CGR540SB0
-N2O-
| Observation |
| Frequency |
: |
Continuous |
| Method |
: |
GC-ECD |
| Instrument |
: |
Hewlett Packard |
HP5840 / HP5880 / HP5890 |
| Description |
: |
In the ALE/GAGE/AGAGE global network program, continuous high frequency gas chromatographic measurements of two biogenic/anthropogenic gases are carried out at globally distributed sites.
The program, which began in 1978, is conveniently divided into three parts associated with three changes in instrumentation: the Atmospheric Lifetime Experiment (ALE), which utilized Hewlett Packard HP5840 gas chromatographs; the Global Atmospheric Gases Experiment (GAGE), which utilized HP5880 gas chromatographs; and the recently initiated Advanced GAGE (AGAGE). AGAGE uses a new fully automated system from the Scripps Institution of Oceanography containing a custom-designed sample module and HP5890 and Carle Instruments gas chromatographic components.
Individual measurements are generally made 4 times daily at each site for ALE, 12 times daily at each site for GAGE and more than 30 times daily at each site for AGAGE. |
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| Calibration |
| Scale |
: |
SIO-1998 scale |
| Description |
: |
The data presented here are reported in the SIO-1998 calibration scale (Prinn et al., JGR 2000). |
| Data Processing |
| Unit |
: |
ppb |
| Description |
: |
The AGAGE database has been completely re-computed (April 1998) to introduce a new and improved pollution analysis scheme and thus pollution designations may differ from previous versions of the data. |
| Average Procedure |
| Hourly |
: |
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| Daily |
: |
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| Monthly |
: |
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| Flag |
| Description |
: |
ALE/GAGE/AGAGE measurements which are suspected to be influenced by local or regional pollution events are marked with a 'P'. |
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