The atmospheric phenomenon is created by ice crystals in the air at low levels during a cold weather period.

这种大气现象 是在寒冷天气里，阳光经低处云层中的冰晶体折射后就会形成的。

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A sundog is another atmospheric optical phenomenon caused by the refraction of sunlight by tiny ice crystals in clouds.

幻日是阳光通过云层中微小冰晶的折射而造成的另一种大气光学现象。

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This phenomenon can contribute to atmospheric warming, which is why methane is considered a greenhouse gas.

这种现象对大气变暖产生影响，这就是为什么甲烷被认为是一种温室气体。

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Therefore, the FRIEND-AMIGO LAC Project is trying to deepen knowledge and understanding of the hydrologic and atmospheric processes leading to floods and the conceptualization and characterization of this phenomenon and its causes in an evolving environment.

UNESCO: Floods

In addition, since fire is a finer-grained and faster-moving phenomenon than weather, a finer grid is used for the fire model than for the atmospheric model each grid square is a few metres, rather than a few tens of metres, across.

ECONOMIST: Next, the fire forecast