that serve the needs of current and future generations for long-term high quality climate records. They are
unique sources of past information about atmospheric parameters, thus are references for climate variability
and change assessments. To highlight this importance, WMO has a mechanism to recognize long-term observing stations. By so doing, the Organization promotes sustainable observational standards and best practices that facilitate the generation of high-quality time series data.
The initiative is envisaged to maintaining long-term observing stations, including in particular stations with more than 100 years observations — Centennial Stations — in support of climate applications (DRR [Disaster Risk Reduction Programme], GFCS [Global Framework for Climate Services], etc.) and research (climate assessment, climate adaptation, etc.). While acknowledging the efforts by Members to run and maintain appropriate observing systems including long-term observing stations, existing and potential difficulties which Members’ NMHSs [National Meteorological and Hydrological Service; mostly national weather services] are facing, due to their overall resource constraints and competing societal interests at national level, are observed by the same time.
The mechanism involves close collaboration between the Commission for Climatology (CCl), the Commission for Basic Systems (CBS), the Commission for Instruments and Methods of Observations (CIMO), the Global Climate Observing System (GCOS) through an ad-hoc advisory board, as well as the WMO Members and the Secretariat. The 69th Session of WMO Executive Council (May 2017) recognized a first set of 60 long-term observing stations following an invitation letter from WMO Secretariat to Members to submit no more than three candidate stations. Further invitation letters will be released every second year to extend the list of WMO recognized long-term observing stations. The next call for the nomination of candidate stations will be issued in early 2018.
The recognition mechanism is based on recognition criteria that address the length, completeness and consistency of observations at a station, the availability of minimum station metadata, data rescue, WMO observing standards including siting classification, observational data quality control and the future of the observing station. A self-assessment template for recognition criteria compliance of individual observing stations has been developed for Members to submit candidate stations, which has to be filled in for each candidate station. After review by the above mentioned advisory board, a list of stations is tabled at Executive Council sessions for final decision. It is envisaged to renew the recognition of observing stations every ten years to ensure criteria compliance.
A special WMO Website has been implemented that provides information on the mechanism and lists candidate and recognized stations:
https://public.wmo.int/en/our-mandate/what-we-do/observations/long-term-observing-stations
Furthermore, the recognition will be reflected in the WIGOS station catalogues. It is also planned to design a certificate per recognized station as well as a metal plate for installation at the station site.
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