Observational evidence for cloud cover enhancement over western European forests.

Differences in daily JJA cloud frequency between forest and non-forest boxes are also highly significant (two-sample t -test, P <0.05), but stronger for Landes ( P =10 −6 and 10 −5 for 2004–2008) than for Sologne ( P =0.01 and 0.02 over the same period).

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