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Neutral impact for upper air analysis (also neutral OBSTAT differences).
Significant small impact , both winter and summer, very localised to near surface T2m and Tskin and mainly in areas with orography (as expected):
Andes, Himalaya, Alpes, and ice capes: Greenland and Antarctica.
Similar impact on T2m in winter and summer.
Illustration of the near surface impact for winter (similar impact for summer, see iver links above) for Tskin and T2m:
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