Atmospheric brown clouds are made up mostly of soot - suspended carbon particles - produced by people burning biomass and fossil fuels.
大气棕色云主要是由人们燃烧生物质和化石燃料产生的炭黑(悬浮的碳颗粒)组成的。
The theory was that 'brown clouds' were cooling the lower atmosphere and therefore masking some of the warming effects of greenhouse gases.
有一种理论认为“棕色云”让低层大气变冷，从而掩盖了温室气体的一些致暖效应。
Astronomers say they're simply being obscured by white clouds of ammonia ice, which float at higher altitudes than the belt's prominent brown clouds.
包含南赤道带的木星云就不见了，天文学家说，云层它们只是被氨冰组成的白云所遮盖，漂浮在高于明显、带状棕色的云层的空间里。
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