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1. The station location is chosen such that, for the variables measured, it is regionally
representative and is normally free of the influence of significant local pollution sources.
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2. There are adequate power, air conditioning, communication and building facilities to sustain
long term observations with greater than 90% data capture (i.e. <10% missing data).
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3. The technical support provided is trained in the operation of the equipment.
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4. There is a commitment by the responsible agency to long term observations of at least one of
the GAW variables in the GAW focal areas (cf. Section 7).
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5. The GAW observation made is of known quality and linked to the GAW Primary Standard.
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6. The data and associated metadata are submitted to one of the GAW World Data Centres no
later than one year after the observation is made. Changes of metadata including
instrumentation, traceability, observation procedures, are reported to the responsible WDC in a
timely manner.
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7. If required, data are submitted to a designated data distribution system in near-real-time.
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8. Standard meteorological in situ observations, necessary for the accurate determination and
interpretation of the GAW variables, are made with known accuracy and precision.
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9. The station characteristics and observational programme are updated in the GAW Station
Information System (GAWSIS) on a regular basis.
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10. A station logbook (i.e. record of observations made and activities that may affect observations)
is maintained and is used in the data validation process.
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