Early in previous interglacial intervals, the methane concentration typically reached a peak of almost 700 parts per billion (ppb) as precession brought summer radiation to a maximum.

 
  • 先前的间冰期早期,夏季辐射由于岁差而达到最大值时,通常甲烷浓度也到达高峰,约700ppb(ppb为十亿分之一)。
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