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 Organization

NO 3
Acronym AEMET
Name State Meteorological Agency of Spain
Address 1 Izana Atmospheric Research Center
Address 2 C/ La Marina, 20, Planta 6, 38001 Santa Cruz de tenerife, Spain
Address 3
Country/Territory Spain
Website http://izana.aemet.es/

 Contact(s)

Name Emilio Cuevas
Prefix Dr.
Email ecuevasa@aemet.es
Organization No 3
Organization acronym AEMET
Organization name State Meteorological Agency of Spain
Organization country/territory Spain
Address 1 C/ La Marina, 20, Planta 6, 38001 Santa Cruz de Tenerife, Spain
Address 2
Address 3
Country/territory Spain
Tel +34-922-151718
Fax +34-922-574475
Last updated date 2022-07-08


Name Pedro Rivas
Prefix Mr.
Email privass@aemet.es
Organization No 3
Organization acronym AEMET
Organization name State Meteorological Agency of Spain
Organization country/territory Spain
Address 1 C/ La Marina, 20, Planta 6, 38001 Santa Cruz de Tenerife, Spain
Address 2
Address 3
Country/territory Spain
Tel +34-922-151718
Fax +34-922-574475
Last updated date 2022-07-08


 Background observation
 UTC
 ppt
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO SF6 X2014
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: GC-3800, Varian(Gas chromatography (ECD))
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: 30 (m)
 15 minutes
 A linear response function relative to the working standard is used. The working standard is injected every 15 minutes. Every two weeks, the relative quadratic response function of the instrument is obtained using five WMO standards.
The working gas tank and the instrument is calibrated every two weeks against five SF6 Izana primary standards (prepared by WMO GAW SF6 CCL).
 See References.
 [Hourly] Hourly data are computed averaging the corresponding physical data for valid ambient injections. SD -> standard deviation of the sample (to compute the standard deviation of the mean, SD must be divided by sqrt(ND))
 [Daily] The daily mean for the day "n" is computed averaging the corresponding available hourly means between 20:00 UTC of day "n-1" and 08:00 UTC of day "n" (so, they could be called "daily night means"). As explained in the paragraph "Sampling environment", the atmospheric conditions at the station during such hours are of pure free troposphere. SD: standard deviation of the sample of hourly means (without taking into account the internal SD of each hourly mean). ND: number of hourly means available for computing the daily night mean (max=12).
 [Monthly] Monthly data are computed averaging the corresponding daily night means (see paragraph "processing on daily data"). SD: standard deviation of the sample of daily night means (without taking into account the internal SD of each daily night mean). ND: number of valid daily night means used.
 No flags are used. Several procedures have been used to identify periods of malfunction of the instrumental system and the associated measurements have been discarded.
 Operational/Reporting
 Scientific Aim : To determine temporal variability of atmospheric SF6 at Izaña (North Atlantic free troposphere background conditions): short-term variability, seasonal variability and long-term trend. To provide data to WDCGG as a Global GAW station.

The Izaña station is located at 2372.90 m above see level, on the Island of Tenerife, Spain. The ground in the vicinity around Izaña is loosely covered with light volcanic soil. The vegetation in the surrounding area is sparse, consisting mainly of broom. A belt of pine forest grows between 1000 and 2000 meters a.s.l. During nighttime (20UTC-08UTC), in situ measurements are representative of free troposphere background conditions. This is due to the following facts: a) usually a strong subtropical temperature inversion layer is located at a lower altitude than Izana station; b) Izana station is located on the top of a crest, so during the night period downslope wind produces (by mass conservation) the arrival of free troposphere air to Izana. During daytime, small amounts of air coming from the forest can arrive to the station (due to surface upslope wind produced by ground diurnal heating) producing a decrease of 1 to 2.5 ppm in CO2 mixing ratio during noon and afternoon. Apart from this effect, there is no arrival of polluted air from the rest of the island, due to the presence of the strong subtropical temperature inversion layer.

The general ambient air inlet, which provides ambient air for all instruments that analyze it, is an 8cm inner diameter (ID) stainless steel pipe and has a high flow rate. This inlet is situated on top of the building tower, the height above the ground is 30 m. Upstream of the GC sample loop (10 ml size), a cryocool trap is used to reduce the dew point of ambient air to -70 C.
 Wind direction: 1
 Wind speed: 1
 Relative humidity: 1
 Precipitation amount: 0
 Air pressure: 0
 Air temperature: 1
 Dew point temperature: 0
 Sea water temperature: 0
 Sea surface water temperature: 0
 Sea water salinity: 0
 Sea surface water salinity: 0
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
 
No DOI available

 Related information

Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All SF6 data contributed to WDCGG by GAW stations and mobiles by 2022-09-05
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2021-08-16
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All SF6 data contributed to WDCGG by GAW stations and mobiles by 2018-10-23
Geolocation Point
Latitude (north: +; south: -) 28.3090000153
Longitude (east: +; west: -) -16.4993991852

 GAW Data Policy

"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

 Citation format

This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Emilio Cuevas (AEMET), Pedro Rivas (AEMET), Atmospheric SF6 at Izaña (Tenerife) by State Meteorological Agency of Spain , dataset published as SF6_IZO_ surface-insitu_AEMET_data1 at WDCGG, ver. 2021-07-23-1317 (Reference date*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.

 Reference(s)

1  Gomez-Pelaez, A.J., R. Ramos, V. Gomez-Trueba, R. Campo-Hernandez, E. Reyes-Sanchez: "GGMT-2015 Izaña station update: instrumental and processing software developments, scale updates, aircraft campaign, and plumbing design for CRDS" in GAW report (No. 229) of the "18th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases, and Related Measurement Techniques (GGMT) (La Jolla, CA, USA, 13-17 September, 2015)", edited by P. Tans and C. Zellweger, World Meteorological Organization, 125-131,2016
2  Gomez-Pelaez, A.J., R. Ramos, V. Gomez-Trueba, R. Campo-Hernandez, P. Novelli "In-situ carbon monoxide measurements at Izaña global GAW station: 2008-2011 time series, uncertainty analysis, and comparison with collocated weekly samples" in GAW report (No. 206) of the "16th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases, and Related Measurement Techniques (GGMT-2011) (Wellington, New Zealand, 25-28 October 2011)", edited by Gordon Brailsford, World Meteorological Organization, 91,2012
3  Gomez-Pelaez, A.J., Ramos, R., "Installation of a new gas chromatograph at Izaña GAW station (Spain) to measure CH4, N2O, and SF6" in GAW Report (No. 186) of the "14th WMO/IAEA meeting of experts on Carbon dioxide, other greenhouse gases, and related tracers measurement techniques (Helsinki, Finland, 10-13 September 2007)", edited by Tuomas Laurila, World Meteorological Organization (TD No. 1487), 5-59, 2009