Climate change reduces warming potential of nitrous oxide by an enhanced Brewer‐Dobson circulation
Climate change reduces warming potential of nitrous oxide by an enhanced Brewer‐Dobson circulation
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DOI：
10.1002/2016gl068390
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发表时间：
2016-06
影响因子：
5.2
通讯作者：
D. Kracher;C. Reick;E. Manzini;M. Schultz;O. Stein
中科院分区：
文献类型：
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作者：
D. Kracher;C. Reick;E. Manzini;M. Schultz;O. Stein
布鲁尔多布森环流（BDC）是平流层-对流层交换的重要驱动力，预计将随着气候变化而加速。这种加速的一个特别后果是一氧化二氮（N2 O）从地球表面的来源向平流层的主要汇区的输送增强，从而导致其寿命缩短。N2 O是一种强效温室气体，也是目前排放的最相关的臭氧消耗物质。在这里，我们研究的影响，减少N2 O的寿命在气候变化的背景下。我们发现其全球变暖潜势（GWP）的下降，由于大气中的N2 O负担的下降，也减少了其总辐射强迫。从理想化的瞬时全球变暖模拟，我们可以确定线性回归N2 O汇，寿命，和GWP与温度上升。因此，我们的研究结果并不局限于特定的情况。
The Brewer‐Dobson circulation (BDC), which is an important driver of the stratosphere‐troposphere exchange, is expected to accelerate with climate change. One particular consequence of this acceleration is the enhanced transport of nitrous oxide (N2O) from its sources at the Earth's surface toward its main sink region in the stratosphere, thus inducing a reduction in its lifetime. N2O is a potent greenhouse gas and the most relevant currently emitted ozone‐depleting substance. Here we examine the implications of a reduced N2O lifetime in the context of climate change. We find a decrease in its global warming potential (GWP) and, due to a decline in the atmospheric N2O burden, also a reduction in its total radiative forcing. From the idealized transient global warming simulation we can identify linear regressions for N2O sink, lifetime, and GWP with temperature rise. Our findings are thus not restricted to a particular scenario.