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Jungfraujoch
-NOy-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
|
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Continuous |
| Sampling environment |
: |
measurements in pristine air, usually negligible local sources |
| Description for sampling analysis |
: |
NOy is determinded as NO after conversion on a heated gold catalyst (300 °C) with 2% CO as a reducing agent.
Data are stored as 10-minute averages.
|
| Instrument and Analysis |
| Measurement method |
: |
Chemiluminescence |
| Current status and history of instrument |
: |
Chemiluminescence, CRANOX, EcoPhysics (Duernten, Switzerland) |
| Description of instrument |
: |
EcoPhysics
CLD 770/gold converter (till 22 January 2007)
CLD 89p/gold converter (since 22 January 2007)
|
| Calibration |
| Current scale employed in the measurement |
: |
NMI PRM BD11 (20ppm ± 0.2ppm)
|
| Measurement calibration |
: |
Every 23 hours an automatic zero-check and an automatic span correction is performed for NO. The conversion efficiency of the gold converter is checked every 49h with NO2 that is generated by gas phase titration of NO with O3.
|
| Scale and calibration(treasability) |
: |
From 1991 UNTIL 09/2001: NIST SRM 2629a (20ppm ± 0.2ppm);
Since 09/2001: NMI PRM BD11 (20ppm ± 0.2ppm)
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| Data Processing |
| Measurement unit |
: |
ppbv |
| Data processing |
: |
Data availability required for calculation: >= 75% of 10-minute values. |
| Processing for averaging |
: |
Processing for Hourly Data:
Overall measurement uncertainties were estimated to be 9% for NOy at 500 ppt (see Zellweger et al., JGR, 2000). This includes the precision of the CLDs, the NO standard uncertainty, the conversion efficiency of the Au catalyst and artifact uncertainties of the zero air check.
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| Data flag |
: |
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| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
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| Reference |
: |
Pandey Deloal S., D. Brunner, M. Steinbacher, U. Weers, J. Staehelin, 2012. Long-term in-situ measurements of NOx and NOy at Jungfraujoch 1998 - 2009: time series analysis and evaluation. Atmospheric Chemistry and Physics, 12, 2551-2566. |
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| submitted by Swiss Federal Laboratories for Materials Testing and Research |
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