大气寿命 atmospheric lifetime 物种从排放源产生到经化学反应或沉降去除，中间有一段在大气中停留的过程。定义某物种在进入大气后到被清除之前在大气中停留的平均时间（经化学转化为其他物种算作被清除）为该物种的大气寿命，也称停留时间。
NF3具有相对短的大气寿命（740年），比C2F6和CF4。更容易分解。HF最终扩散到大气中，在大气中它通过湿沉积被除去。
NF3 has a relatively short atmospheric lifetime (740 years) and dissociates more readily than C2F6 and CF4. HF ultimately diffuses down to the troposphere where it is removed by wet deposition.
虽然它作为自由气体在大气中的寿命比二氧化碳要短的多，但要说吸热能力，它比后者强23倍。
Although its lifetime in the atmosphere as a free gas is much shorter than CO2, it is 23 times more potent in terms of its heat trapping ability.
这是因为黑碳在大气中滞留1至4周，而二氧化碳的寿命为数百年乃至数千年。
That is because black carbon lingers in the atmosphere for one to four weeks, compared to CO2's lifetime of centuries to millennia.
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