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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Redistribution of nitric acid in the Arctic lower stratosphere during the winter of 1996-1997
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Redistribution of nitric acid in the Arctic lower stratosphere during the winter of 1996-1997

机译：1996-1997年冬季，硝酸在北平流层的再分布

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Vertical profiles of HNO3, N2O, O-3, and the aerosol extinction coefficient at 780 nm were observed by the Improved Limb Atmospheric Spectrometer (ILAS) on board the Advanced Earth Observing Satellite (ADEOS) during the Arctic winter of 1996-1997. Irreversible redistribution of HNO3 is evaluated using HNO3-N2O and HNO3-O-3 correlations. Denitrification and nitrification started to be observed just after the Arctic vortex cooled to below the ice frost point (T-ICE) on February 10. Trajectory analyses show that denitrification occurred only in air masses, which were once cooled to near T-ICE and were kept at temperatures below the nitric acid trihydrate saturation threshold continuously for more than 4 days. Such a temperature history provides the necessary conditions for nucleation and growth of particles causing denitrification. The average extent of denitrification at 19 km reached 43% at the center of the vortex, suggesting that stratospheric ozone could be affected by denitrification. deep inside the vortex. Denitrification (>2 ppbv) and nitrification (>1 ppbv) covered 40 +/- 10% and 35 +/- 10% of the vortex area, respectively. Redistributed numbers of HNO3 molecules at each altitude were calculated by integrating the area-weighted changes in the HNO3 concentration. The decreases in total HNO3 concentration at 17-21 kin in late February and early March agreed with the increases at 12-15 kin to within 25%, confirming conservation of HNO3 during sedimentation and evaporation of HNO3-containing polar stratospheric cloud particles. [References: 54]
机译：在1996-1997年的北极冬季，先进的地球观测卫星（ADEOS）上的改进的Limb大气光谱仪（ILAS）观测到了HNO3，N2O，O-3的垂直剖面以及780 nm处的气溶胶消光系数。使用HNO3-N2O和HNO3-O-3相关性评估HNO3的不可逆重新分布。在2月10日北极涡流冷却至冰霜点（T-ICE）以下后开始观察到反硝化作用和硝化作用。轨迹分析表明，反硝化作用仅发生在曾经冷却至T-ICE附近且在连续保持在低于硝酸三水合物饱和阈值的温度下超过4天。这样的温度历史为引起反硝化的颗粒成核和生长提供了必要的条件。在19 km处的平均反硝化程度在涡旋中心达到43％，这表明平流层臭氧可能受到反硝化的影响。在漩涡深处。反硝化（> 2 ppbv）和硝化（> 1 ppbv）分别覆盖涡流区域的40 +/- 10％和35 +/- 10％。通过对HNO3浓度的面积加权变化进行积分，计算出每个海拔高度的HNO3分子的重新分布数。在2月下旬和3月初，总HNO3浓度降低了17-21 kin，而在12-15 kin处增加了25％以内，这证实了HNO3在含HNO3的极地平流层云团颗粒沉降和蒸发过程中的保守性。 [参考：54]

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