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Greenhouse gas growth rates

机译:温室气体增长率

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We posit that feasible reversal of the growth of atmospheric CH4 and other trace gases would provide a vital contribution toward averting dangerous anthropogenic interference with global climate. Such trace gas reductions may allow stabilization of atmospheric CO2 at an achievable level of anthropogenic CO2. emissions, even if the added global warming constituting dangerous anthropogenic interference is as small as 1degreesC. A 1degreesC limit on global warming, with canonical climate sensitivity, requires peak CO2 approximate to 440 ppm if further non-CO2 forcing is +0.5 W/m(2), but peak CO2 approximate to 520 ppm if further non-CO2 forcing is -0.5 W/m(2). The practical result is that a decline of non-CO2 forcings allows climate forcing to be stabilized with a significantly higher transient level of CO2 emissions. Increased "natural" emissions of CO2, N2O and CH4 are expected in response to global warming. These emissions, an indirect effect of all climate forcings, are small compared with human-made climate forcing and occur on a time scale of a few centuries, but they tend to aggravate the task of stabilizing atmospheric composition.
机译:我们认为,大气中CH4和其他微量气体生长的可行逆转将为避免危险的人为干扰全球气候做出重要贡献。这种微量气体的减少可以使大气中的二氧化碳稳定在可达到的人为二氧化碳水平。即使增加的全球变暖构成危险的人为干扰,排放量也仅为1摄氏度。将全球变暖限制在1摄氏度以内,并且具有典型的气候敏感性,如果进一步的非CO2强迫为+0.5 W / m(2),则需要峰值CO2大约为440 ppm,但是如果进一步的非CO2强迫是-则峰值CO2大约为520 ppm- 0.5 W / m(2)。实际结果是,非CO2强迫的下降使稳定的气候强迫具有明显更高的瞬时CO2排放水平。随着全球变暖,预计二氧化碳,一氧化二氮和甲烷的“自然”排放量会增加。这些排放是所有气候强迫的间接影响,与人为的气候强迫相比,其排放量很小,并且发生时间长达几个世纪,但它们却加剧了稳定大气成分的任务。

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