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Dear European and Northern Africa Brewer spectrophotometer user community:

This is an invitation to European Brewer experts and/or operators to participate in the sixth Regional Brewer Calibration Center for Europe (RBCC-E) intercomparison that will be held at El Arenosillo Atmospheric Sounding Station of the “Instituto Nacional de Técnica Aeroespacial” (INTA) during the period July 5-15, 2011.<br>This sixth 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 the “Area of Instrumentation and Atmospheric Research” of INTA, with the support of the Global Atmospheric Watch (GAW) program of the World Meteorological Organization (WMO) and a CEOS project of the European Space Agency (ESA).

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 southern and central Europe.<br>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 INTA. Four or five Dobson instruments, including the European Regional Standard D064, will take part in this campaign. During the first days, both calibration campaigns will be performed independently in parallel. The last days of the intercomparison 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.

6th RBCC-E Calibration Campaign, El Arenosillo Atmospheric Sounding Station, (INTA), Huelva (Spain). 5 to 15 July, 2011.

The campaign is scheduled in three main phases:

*Initial calibration to assess the current calibration of the instruments. *Servicing, adjustments and maintenance works characterization test of the instruments. *Final calibration. In this phase the ‘UV’ calibrations against the QASUME *Specific measurements for Brewer/Dobson comparison

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 traveling reference (B185) *Compilation of the calibration histories of the instruments

The QASUME (Quality Assurance of Spectral Ultraviolet Measurements in Europe) unit from the PMOD-WRC will provide a UV calibration.

For accommodation details see Annex 3.

The El Arenosillo Atmospheric Sounding Station (INTA). Accommodation details are given in Annex 3

Click Here for a Google Map location.

<!–===Intructions to the participants===–> <!–Instructions to the Participants are already available. Please check them to see if you are ready!–> <!–=== Updated Participant list === –> <!–21/07/2007 Participants List–> The organizers can invite up to 7 instruments with up to two operators per instrument. All participants are requested to contact the campaign coordinators and fill in the registration forms and registration forms before 1st June.

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 participants must directly order the service and agree fees 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>

José Manuel Vilaplana National Institute for Aerospace Technology Atmospheric Research and Instrumentation Branch Atmospheric Sounding Station “El Arenosillo”

Ctra. San Juan del Puerto - Matalascañas Km.33 21130 Mazagon, Huelva Spain

Tel: +34-959.20.88.58 Fax: +34-959.20.88.57 Email: <mail>vilaplanagjm@inta.es</mail>

• Emilio Cuevas (<mail>ecuevasa@aemet.es</mail>); Izaña Atmospheric Research Center, Director (AEMET)
• Manuel Gil (<mail>gilm@inta.es</mail>); Atmospheric Research and Instrumentation, Head (INTA)
• Benito de la Morena (<mail>morenacb@inta.es</mail>); El Arenosillo Atmospheric Sounding Station, Head (INTA)

Please confirm your participation before June 1, 2011

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 following 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

The following hotels are in Mazagón (the nearest village to the “El Arenosillo” Atmospheric Sounding Station). Due to the high season and limited number of rooms in Hotel Albaida, we suggest to book your accommodation as soon as possible.

Our first recommendation is Hotel Albaida:

• Albaida (*) :Telephone: +34.959376029/FAX: +34.959376108 :E-mail: <mail>informacion@hotelalbaida.com</mail> :Double room for individual use 62 €, breakfast + 1 meal included (from July 8th :72€ due to high season) There is a number of rooms booked for this campaign, so please, do not forget to mention in subject of your booking mail “INTA Campaign” Other available accommodations: * Parador de Mazagón () :Telephone: +34.959536300/FAX: +34.959536228 :E-mail: <mail>mazagon@parador.es</mail> :Double room for individual use 144 €, double use 180 € *Carabela Santa María (*)

:Telephone: +34.959536018/FAX: +34.959377258 :Double room for individual use: 70 €, includes breakfast + one meal.

*Hotel Mazagonia () :Telephone: +34.959377870 :E-mail: <mail>Info@mazagonia.es</mail> :Double room for individual use 115€ , double use 175€, includes breakfast + one meal.

*Hotel Solvasa (*) :Telephone: +34.959377879 :E-mail: <mail>mazagon@solvasa.com</mail> :Double room for individual use: 76.50€, includes breakfast + one meal. * Hotel Martín Alonso Pizón (*) :Telephone: +34.959377825/35 :Double room for individual use: 60 € (only bed), 84€ including breakfast + one meal.

• El Remo (apartments)

:Telephone: +34.959376020 :Double room for individual use 66€ , includes breakfast + one meal.

*Hostal Hilaria :Telephone: +34.959376206) :Double: 55€, Individual: 36€.

*Hostal Acuario :Telephone: +34.959.377.286, Fax: +34.959377258 :E-mail: <mail>hostalacuario@turinet.net</mail> :Studio apartments with kitchen: 2 people 55 €, 3 people 65 € and 4 people 75 € :Rooms with bathroom: single 35 €, 2 people 45 € and 3 people 55 €

*Camping Doñana :Telephone: +34.959.53.62.81, Fax: +34 959 536313 :Brand new comfortable wooden cabins with different housing capacity, with or without kitchen, prices from 65 €.

Please, contact Ms Pilar Sanz (<mail>sanzcp@inta.es</mail>) for updated and accurate hotel information.

Campaigns