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Dear European Brewer spectrophotometer user community member:

This is an invitation to European Brewer operators to participate in the seventh Regional Brewer Calibration Center for Europe (RBCC-E) intercomparison that will be held at Arosa Lichtklimatisches Observatorium LKO of MeteoSwiss during the period July 16-27, 2012.<br>This seventh campaign will be a joint exercise of the Regional Dobson Calibration Center for Europe (RDCC-E) and the Regional Brewer Calibration Center for Europe (RBCC-E) in collaboration with MeteoSwiss, with the support of the Global Atmospheric Watch (GAW) program of the World Meteorological Organization (WMO) and ESA (European Space Agency).

In November 2003, and within the GAW/WMO program, the Regional Brewer Calibration Centre for RA-VI Region (Europe) (RBCC-E) was established by Izaña Atmospheric Research Centre (I-ARC) at Izaña Observatory (IZO, Canary Islands), managed by the “Agencia Estatal de Meteorología” (AEMET, Spain). Technical and organization information of the RBCC-E can be obtained at www.rbcc-e.org. Experts of the Ad-Hoc Regional Brewer Scientific Group (RBSG-E) advice the RBCC-E, see the list in Annex 1, with particular working tasks (see Annex 2).

At present, the RBCC-E maintains a triad of reference instruments. The Regional Primary Reference Spectrophotometer (B157) and the Regional Travelling Reference Spectrophotometer (B185) are part of the triad. Each spectrophotometer is calibrated independently with the standard Langley method at IZO. These instruments are also regularly compared against the World Brewer Reference Triad (BRT) maintained by the Meteorological Service of Canada (MSC, Toronto) via the calibration service provided by the International Ozone Services (IOS). The IZO travelling reference (B185) being transported to field calibration missions at different sites in Europe.

In order to maintain the continuity of the calibration scale of the BRT with the current transfer by the RBCC-E, the travelling reference (B017) operated by IOS experts will participate to this intercomparison. That will allow participants to order IOS for technical servicing on their instruments during the campaign. The action focuses on the calibration of Brewer spectrophotometers from south and central Europe.

The Dobson campaign is organized by Regional Dobson Calibration Centre - Europe (WMO RDCC-RA-VI) managed by the Meteorological Observatory Hohenpeissenberg (Germany), in cooperation with MeteoSwiss. During the first days, both calibration campaigns will be performed independently in parallel, while the last days of the campaign are reserved for the Dobson - Brewer comparison.

The QASUME unit of the Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center (PMOD /WRC) will participate and provide a global UV reference spectrum for the ultraviolet measurements.

7th RBCC-E Calibration Campaign, LKO, Arosa (Switzerland). 16 to 27 July, 2012

Note: Click on Agenda tab below to see a detailed events list.

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The following operations are offered by the RBCC-E during the intercomparison:

*Ozone calibration against the RBCC-E travelling reference (B185) and the World travelling reference (B017) managed by IOS (International Ozone Services). *Compilation of the calibration histories of the instruments *UV calibration performed by the QASUME (Quality Assurance of Spectral Ultraviolet Measurements in Europe) unit from the PMOD-WRC. *Umkehr validation against ozone-sondes from Payerne (CH) and Hohenpeissenberg (D)

LichtKlimatisches Observatorium MeteoSwiss, Arosa. Accommodation details are given in Annex 3.<br>Click Here for a Google Map location.

3 Brewer spectrophotometers from MeteoSwiss<br>2 Reference Instruments (Brewer #017 and Brewer#185)

The organizers can invite up to 7 more instruments with up to two operators per instrument.

The instruments should be operative, equipped with tripods and run by their usual operator. History of the instrument (AVG Files), last calibration and recent observations (B files) must be available at the intercomparison. Updated technical aspects can be checked through www.rbcc-e.org.

Travelling, instrument transportation and accommodation costs should be covered by the participants. Extra financial support for developing countries or countries with economies in transition may be available from WMO-GAW. In case of major repairs, the guests can directly order the service with the IOS Company.

Alberto Redondas State Meteorological Agency -AEMET

Izaña Atmospheric Research Center I-ARC C/ La Marina, 20, 38071 Santa Cruz de Tenerife Spain

Tel: +34-922-574487 Fax: +34-922-574475 Email: <mail pre=“”>aredondasm@aemet.es</mail>

Herbert Schill Werner Siegrist René Stübi Federal Office of Meteorology and Climatology MeteoSchweiz

Haus Steinbruch CH-7050 Arosa Switzerland

Tel: +41-81-377-26-16 Fax: +41-81-377-19-01 Email: <mail pre=“”>herbert.schill@meteoswiss.ch</mail>, <mail pre=“”>werner.siegrist@meteoswiss.ch</mail>, <mail pre=“”>rene.stubi@meteoswiss.ch</mail>

*Dominique Ruffieux (<mail>dominique.ruffieux@meteoswiss</mail>); Aerological Sounding Station, Payerne *Werner Siegrist (<mail>werner.siegrist@meteoswiss.ch</mail>); LKO Arosa, Station head *Bertrand Calpini (<mail>bertrand.calpini@meteoswiss</mail>); Aerological Sounding Station, Payerne (MeteoSwiss) *Franz Herzog (<mail>franz.herzog@slf.ch</mail>); Technician, SLF, Davos

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Please confirm your participation before May 30, 2012

List of Regional Brewer Scientific Group members along with their mail addresses.

Note: Email address links are Spam-protected on this site.

You will need a javascript-enabled browser to see email addresses correctly.

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With reference to responses submitted after the RBSG-E meeting held at El Arenosillo/Mazagon, September 2003 the following specialists from Europe and MSC have been affiliated with particular working tasks defined at the meeting. Underlined are the experts which have expressed their preliminary interest to lead/coordinate groups on the working tasks.

*WT1: Establishment and maintenance of Regional Brewer Reference Spectrophotometers: E. Cuevas, A. Redondas, M. Stanek, T. Grajnar

*WT2: Instruments. Calibration histories: K. Vanicek

*WT3: Relation between the Dobson and Brewer calibration scales: J. Staehelin, H. DeBacker, U. Köhler, J. Krzyscin, K. Vanicek

*WT4: UV calibration of Brewer spectrophotometers: J. Gröbner, A. Bais, T. Koskela

*WT5: Measurements of UV Aerosol Optical Depth with Brewer spectrophotometers: A. Bais, H. DeBacker, J. Gröbner, J. Jaroslawski

In Arosa resort, there are many hotels at a few minutes walking distance from the Observatory. The prices are around € 90 for halfboard (breakfast + evening meal). A pre-reservation has been done at the closest hotels:

*Streiff (*) :Telephone: +41.(0) 81 378 71 71/FAX: +41.(0) 81 378 71 78 :E-mail: <mail>mail@streiff.ch</mail> *Hohe Promenade () :Telephone: +41.(0) 81 378 77 00/FAX: +41.(0) 81 378 77 07 :E-mail: <mail>info@hoproarosa.ch</mail> *Hohenfels (*)

:Telephone: +41.(0) 81 378 56 56/FAX: +41.(0) 81 378 56 57 :E-mail: <mail>reception@arosabergbahnen.ch</mail>

Campaigns