An estimate of the flux of stratospheric reactive nitrogen and ozone into the troposphere
An estimate of the flux of stratospheric reactive nitrogen and ozone into the troposphere
复制标题
平流层活性氮和臭氧进入对流层通量的估计
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
D. Fahey
中科院分区：
文献类型：
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作者：
D. Murphy;D. Fahey
利用观测到的N2 O与NOy和O3的相关性，估算了平流层活性氮（NOy）和O3的全球平均年净向下通量。在平流层下部观测到的相关性的线性允许NOy和O3的向下通量与N2 O的向上通量有关。N_2O上升通量可由平流层光化学和物质平衡计算。通过这种方式，复杂的光化学和NOy和O3的传输可以通过涉及N2 O的简单得多的计算来限制。NOy净通量估计值为0.45 Tg（N）yr−1（范围0.23-0.73），略低于先前的估计值，但在不确定性范围内。来自南极冬季平流层的NOy降水可能是平流层下部每年全球通量的一个重要部分。平流层NOy的全球收支表明，N2 O寿命大于160年与通过南极冬季涡旋的大量物质流不一致。估计的O3通量为3.5×1010个分子cm−2 s−1（范围1.5-6.8），与以前使用完全独立技术的估计值吻合得很好。
The globally averaged net downward annual fluxes of reactive nitrogen (NOy) and O3 from the stratosphere are estimated using observed correlations of N2O with NOy and O3. The linearity of the observed correlations in the lower stratosphere allows the downward fluxes of NOy and O3 to be related to the upward flux of N2O. The upward flux N2O can be calculated from a mass balance and stratospheric photochemistry. In this way, the complicated photochemistry and transport of NOy and O3 can be bounded by a much simpler calculation involving N2O. The estimated NOy net flux of 0.45 Tg (N) yr−1 (range 0.23–0.73) is slightly less than previous estimates, but within the range of uncertainty. Precipitation of NOy from the Antarctic winter stratosphere may be a significant fraction of the annual global flux out of the lower stratosphere. The global budget for stratospheric NOy shows that an N2O lifetime greater than 160 years is inconsistent with extensive mass flow through the Antarctic winter vortex. The estimated O3 flux of 3.5×1010 molecules cm−2 s−1 (range 1.5–6.8) agrees well with previous estimates using completely independent techniques.