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            <gco:CharacterString>Met Office Northern Hemisphere Gridded 1000-500hPa Geopotential Height Thickness Daily and Monthly Series</gco:CharacterString>
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The geopotential thickness between pressure levels — difference of the 1000 hPa and 500 hPa geopotential heights for example — is proportional to mean virtual temperature in that layer.

The data is supplied by the Met Office, Hadley Centre.</gco:CharacterString>
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