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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Polar stratospheric descent of NO_y and CO and Arctic denitrification during winter 1992-1993
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Polar stratospheric descent of NO_y and CO and Arctic denitrification during winter 1992-1993

机译：1992-1993年冬季NO_y和CO的极地平流层下降和北极反硝化

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摘要

Observations inside the November 1994 Antarctic stratospheric vortex and inside the April 1993 remnant Arctic stratospheric vortex by the Atmospheric Trace Molecule Spectroscopy (ATMOS) Fourier transform spectrometer are reported. In both instances, elevated volume mixing ratios (VMRs) of carbon monoxide (CO) were measured. A peak Antarctic CO VMR of 60 ppvb (where 1 ppbv = 10~(-9) per unit volume) was measured at a potential temperature ( ) of 710 K (approx 27 km), about 1 km below the altitude of a pocket of elevated NO_y (total reactive nitrogen) at a deep minimum in N_2O (< 5 ppbv). The Arctic observations also show a region of elevated vortex CO with a peak VMR of 90 ppbv at 630-670 K (approx 25 km) but no corresponding enhancement in NO_y, perhaps because of stronger dynamical activity in the northern hemisphere polar winter and/or interannual variability in the production of mesospheric or lower thermospheric NO. By comparing vortex and extravortex observations of NO_y obtained at the same N_2O VMR, Arctic vortex denitrification of 5 +- 2 ppbv at 470 K (approx 18 km) is inferred. We show that our conclusion of substantial Arctic winter 1992-1993 denitrification is robust by comparing our extravortex observations with previous polar measurements obtained over a wide range of winter conditions. Correlations of NO_y with N_2O measured at the same by ATMOS in the Arctic vortex and at midlatitudes on board the ER-2 aircraft several weeks later lie along the same mixing line. The result demonstrates the consistency of the two data sets and confirms that the ER-2 sampled fragments of the denitrified Arctic vortex following its breakup. An analysis of the ATMOS Arctic measurements of total hydrogen shows no evidence for significant dehydration inside the vortex.
机译：据报道，1994年11月南极平流层涡旋内和1993年4月残留的北极平流层旋涡内用大气痕量分子光谱（ATMOS）傅里叶变换光谱仪进行了观测。在这两种情况下，均测量到一氧化碳（CO）的体积混合比（VMR）升高。在710 K（约27 km）的潜在温度（）下测得的南极CO VMR峰值为60 ppvb（其中每单位体积1 ppbv = 10〜（-9）），低于口袋高度1 km在N_2O（<5 ppbv）中以极小的最小值升高了NO_y（总活性氮）。北极的观测结果还显示出涡旋CO升高的区域，在630-670 K（约25 km）处的VMR峰值为90 ppbv，但NO_y没有相应增加，这可能是由于北半球极地冬季和/或中层或较低热层NO产生的年际变化。通过比较在相同的N_2O VMR下获得的NO_y的涡旋和涡旋观测，可以推断出470 K（约18 km）时5 + -2 ppbv的北极涡旋反硝化作用。通过将我们的涡旋观测结果与以前在大范围冬季条件下获得的极地测量值进行比较，我们证明了我们对1992-1993年冬季北极大量反硝化的结论是可靠的。数周后，由ATMOS在北极涡旋中和在中纬度的ER-2飞机上测得的NO_y与N_2O的相关性均位于同一混合线上。结果证明了这两个数据集的一致性，并证实了反硝化北极涡流破裂后的ER-2采样碎片。对ATMOS北极的总氢测量结果的分析表明，旋涡内部没有明显的脱水迹象。

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