No.8

Introduction
Data Policy
Data
Documentation
Contact Information



Pic du Midi

-CO-

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Station Contact Person(s) Observation Data and Quick Plot

Observation
Category : Air sampling observation
Situation : ongoing
Time zone : UTC


Sampling
Sampling height : 4
Description : continuous
Sampling and analysis frequency : CO is sampled every 10 seconds. Data are averaged every five minutes, and stored in database.
Sampling environment : Situated in free troposphere, this station is influenced by synoptic scale pollution from plain industrial activities.
Description for sampling analysis :


Instrument and Analysis
Measurement method : Light absorption analysis (IR, except NDIR)
Current status and history of instrument :
Description of instrument : Range: 0 - 5000 ppm
Average Time 10 - 300s

Zero/span check level Zero drift: 20ppb Span drift 10%

Pecision 95% CI < 10%


Calibration
Current scale employed in the measurement : Traceable to national standard scale ( EMD : Ecole des Mines de Douai - France )
Measurement calibration : Instrument calibration is excuted in LA Laboratory with the control of "l'Ecole des Mines de Douai" EMD
Scale and calibration(treasability) :


Data Processing
Measurement unit : ppb
Data processing : The raw data from the instrument is collected by the data acquisition system and sendes to database computer in five minutes average raw data
Processing for averaging : Processing for Hourly Data:
Hourly data are generated by arithmetic means of the previous hour data
Invalid data are not included. An hour interval with less than 75% avalable values is forced with a "-999" mean
Processing for Daily Data:
Daily data are generated by arithmetic means of the previous day data
Invalid data are not included. An daily interval with less than 75% avalable values is forced with a "-999" mean
Processing for Monthly Data:
Monthly data are generated by arithmetic means of the previous month data
Invalid data are not included. An monthly interval with less than 75% avalable values is forced with a "-999" mean
Data flag :
Data remarks :


Other Information
Scientific aim :
Reference :


submitted by Laboratoire d'Aérologie

The WDCGG is operated by the Japan Meteorological Agency
in collaboration with the World Meteorological Organization