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Why are there multiple records and duplicate flags for the WMO station IDs in GHCN?

April 26, 2017duplicate flags ghcn IDs records station wmo

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Why are there multiple records and duplicate flags for the WMO station IDs in GHCN?

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Are the methods for combining the station records biasing the surface trends Yes. Jeff Id, using methods developed by Roman M, demonstrated that the CRU method of station combination introduces a slight cooling bias. GISTEMP’s method of taking the means of latitudinal weighted zones leads to cooler record than CRU’s method of using weighted cells within hemispheres.