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On the consistency of HNO3 and NO2 in the Aleutian High region from the Nimbus 7 LIMS Version 6 data set

机译：从Nimbus 7 LIMS版本6数据集中了解阿留申高原地区HNO3和NO2的一致性

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This study uses photochemical calculations along kinematic trajectories in conjunction with Limb Infrared Monitor of the Stratosphere (LIMS) observations to examine the changes in HNO3 and NO2 near 30 hPa in the region of the Aleutian High (AH) during the minor warming event of January 1979. An earlier analysis of Version 5 (V5) LIMS data indicated increases in HNO3 without a corresponding decrease in NO2 in that region and a quasi-wave 2 signature in the zonal distribution of HNO3, unlike the wave 1 signal in ozone and other tracers. Version 6 (V6) LIMS also shows an increase of HNO3 in that region, but NO2 is smaller than from V5. The focus here is to convey that V6 HNO3 and NO2 are of good quality, as shown by a re-examination of their mutual changes in the AH region. Photochemical model calculations initialized with LIMS V6 data show increases of about 2 ppbv in HNO3 over 10 days along trajectories terminating in the AH region on 28 January. Those increases are mainly a result of the nighttime heterogeneous conversion of N2O5 on background stratospheric sulfuric acid aerosols. Changes in the composition of the air parcels depend on the extent of exposure to sunlight and, hence, on the dynamically controlled history of the trajectories. Trajectories that begin in low latitudes and traverse to across the North Pole in a short time lead to the low HNO3 in the region separating the anticyclone from the polar vortex, both of which contain higher HNO3. These findings help to explain the observed seasonal evolution and areal extent of both species. V6 HNO3 and NO2 are suitable, within their errors, for the validation of stratospheric chemistry–climate models.
机译：这项研究结合沿运动轨迹的光化学计算以及平流层的肢体红外监测器（LIMS）的观测结果，研究了1979年1月的轻微升温事件中阿留申高原（AH）地区HNO3和NO2在30 hPa附近的变化。 。第5版（V5）LIMS数据的较早分析表明，与臭氧和其他示踪剂中的第1波信号不同，HNO3的增加而该区域的NO2没有相应减少，并且HNO3的区域分布中出现了准波2签名。版本6（V6）LIMS也显示该区域中HNO3的增加，但NO2小于V5。这里的重点是要传达V6 HNO3和NO2的质量，这是对AH地区相互变化的重新检验所显示的。用LIMS V6数据初始化的光化学模型计算显示，沿1月28日在AH区终止的轨迹，HNO3在10天内增加了约2 ppbv。这些增加主要是夜间平流层硫酸气溶胶中N2O5异质转化的结果。空气包裹成分的变化取决于暴露于阳光的程度，因此取决于轨迹的动态控制历史。从低纬度开始并在短时间内横穿北极的轨迹会导致在将反旋风分离器与极涡旋隔开的区域中出现低HNO3，这两个区域都含有较高的HNO3。这些发现有助于解释观察到的两个物种的季节演变和面积范围。 V6 HNO3和NO2在误差范围内适用于平流层化学气候模型的验证。

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