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Zugspitze / Schneefernerhaus
-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 |
: |
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| Description for sampling analysis |
: |
Chemiluminescence detection of NO, specific transformation of NOy to NO with a gold/CO converter at 300oC. Height of the line is 20 meters above the ground and 2.5m over the top of the measurement station.
Measurement of NO with chemiluminescence (reaction with O3) detection, (LDL " 50 ppt). |
| Instrument and Analysis |
| Measurement method |
: |
Chemiluminescence |
| Current status and history of instrument |
: |
Chemiluminescence |
| Description of instrument |
: |
ECO Physics AG
Cranox, # 77320 |
| Calibration |
| Current scale employed in the measurement |
: |
EUROTRAC/TOR project |
| Measurement calibration |
: |
Calibration gas: dynamic dilution, NO in air + gas phase titration, reference to NO. Calibrations are carried out every 48 to 72 hours. Precision gas diluter is calibrated according to NIST standard. |
| Scale and calibration(treasability) |
: |
Certified NO concentrations in cylinders are used for calibration, validated by international intercomparisons (e.g. EUROTRAC/TOR project) |
| Data Processing |
| Measurement unit |
: |
ug/m3-20C |
| Data processing |
: |
All values are quality controlled. |
| Processing for averaging |
: |
Processing for Hourly Data:
The data acquisition system provides one raw value every 2.5 minutes.. Zero/calibration factors and data protocols are used to convert raw data into calibrated data. Invalid data caused by local impact, malfunction or other effects are detected by comparison/ correlation with other trace substances and meteorological data and with information from the station logbook and then are rejected. 30 min mean values are generated by calculating the arithmetic mean of the remaining data with number of data more than 15. For reporting to GAW hourly mean values are calculated from these half hourly data.
Processing for Daily Data:
Daily: Take the arithmetic mean of selected half hourly data with the number of data more than 31.
Processing for Monthly Data:
Monthly: Take the arithmetic mean of selected half hourly data with the number of data more than 960. |
| Data flag |
: |
Hourly
1: valid value
6: missing value due to calibration
9: missing
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| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
To provide data for research to reveal long term trends of air pollution, long distance transport and climate change in Central Europe. |
| Reference |
: |
"Qualitatssicherungs-Handbuch des UBA-Messnetzes", UBA Texte 28/04, (Handbook for quality assurance for the measurement network for the Federal Environmental Agency, Germany), Dr.Klaus Nienerowski, Umweltbundesamt, Berlin, Juni 2004
http://www.umweltbundesamt.de/luft/luftmessnetze/ubamessnetz.htm |
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| submitted by Federal Environmental Agency Germany |
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