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Sea of clouds (SOC) formation was observed over three years in Nagano Prefecture. Large-scale SOCs were commonly observed in early morning, while small-scale SOCs in the eastern valley corresponded with low-level orographic clouds ascending mountain slopes. On days of wide-ranging SOCs, 67% were associated with a subsidence inversion layer from a synoptic-scale high pressure system, indicating that along with nocturnal radiative cooling, the subsidence inversion layer plays an important role in forming large-scale SOCs.
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University of Tsukuba
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