Federal Department of Home Affairs FDHA
Federal Office of Meteorology and Climatology MeteoSwiss
Overview of Swiss activities
R. Stübi, D. Ruffieux, B. Calpini
Federal Office of Meteorology and Climatology,
MeteoSwiss, Switzerland
Acknowledgements for the different “teams” behind these activities:
Payerne team
Arosa team
Collaborating laboratories
Swiss organisation
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Main task of MeteoSwiss is monitoring
Applied research in support to monitoring
R&D are mainly devoted to Universities and Research
Laboratories
Outline of the presentation
 Examples of ozone time series measured in
Switzerland : Arosa, Payerne, and Nairobi
 Data quality control: Brewer triade stability
 Applied research : Automated Dobson
2
Outline of the presentation
 Examples of ozone time series measured in
Switzerland : Arosa, Payerne, and Nairobi
 Data quality control: Brewer triade stability
 Applied research : Automated Dobson
3
Arosa station total ozone monitoring site
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Arosa Alpine site (1850 masl) with Brewer and Dobson
Monitoring activity focused on total ozone and Umkehr
Triade of Brewer : Brewer : B040 (1988), B072 (1993), B156 (1998)
Triade of Dobson : D101 (1968), D051 (1991), D062 (1993)
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Arosa long term total ozone series
Yearly mean of Dobson total ozone column [DU]
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Payerne station ozone monitoring site
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Payerne Mittelland site (491 masl) with radiosounding and
microwave radiometer (in collaboration with Uni Bern IAP)
Monitoring activity focused on profiles
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Payerne 2002: change from BM to ECC ozone sondes
After a larger series of BM - ECC dual flights, Payerne changed to ECC sonde
No difference are noticeable at the different levels !
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Microwave radiometer GROMOS time series (Uni Bern IAP)
Microwave radiometer SOMORA time series (Payerne)
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Payerne is supporting the Nairobi ozone station
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Radiosoundings since 1996
Dobson measurements for 1984 – 1999
and again since 2005 (MCH resp.)
Surface ozone since 2012
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Outline of the presentation
 Examples of ozone time series measured in
Switzerland : Arosa, Payerne, and Nairobi
 Data quality control: Brewer triade stability
 Applied research : Automated Dobson
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Times series of Brewer B040 total ozone
400
350
300
250
Ozone [DU]
450
500
Single Brewer values total ozone column [DU]
2002
2004
2006
2008
2010
2012
2014
Time
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-0.5
0.0
0.5
B040 B072 B156
-1.0
05% - 95% / triade average [%]
1.0
Monthly difference toward Brewer triade mean [%]
2002
2004
2006
2008
2010
2012
Time
12
Outline of the presentation
 Examples of ozone time series measured in
Switzerland : Arosa, Payerne, and Nairobi
 Data quality control: Brewer triade stability
 Applied research : Automated Dobson
13
From a «classical» manual Dobson to …
14
.. an automated Dobson system
Attenuator
Wavelength selector
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Sun tracking mechanisms
Sun elevation
Sun azimuth
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Dobson: from manual to automated measurements
360
345
350
355
14/04/2014
340
Total ozone column [DU]
Manual operation impacts the reproducibility, the measurement frequency and
the costs.
Time series for Brewer 040 and automated Dobson 062
07:00
08:00
09:00
10:00
11:00
Time
12:00
13:00
14:00
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Summary
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Our main goal is to provide highest quality and longest
possible time series of ozone to the scientific community
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Monitoring implies
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Long-term support
Scientific accompaniment of data acquisition (QA/QC)
Good collaboration between monitoring stations and scientific
laboratories and Universities
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