NOy from Michelson Interferometer for Passive Atmospheric Sounding on Environmental Satellite during the Southern Hemisphere polar vortex split in September/October 2002
NOy from Michelson Interferometer for Passive Atmospheric Sounding on Environmental Satellite during the Southern Hemisphere polar vortex split in September/October 2002
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2002 年 9 月/10 月南半球极涡分裂期间环境卫星被动大气探测迈克尔逊干涉仪的 NOy
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发表时间：
2005
期刊：
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通讯作者：
D. Y. Wang
中科院分区：
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作者：
G. Tsidu;G. Stiller;T. Clarmann;B. Funke;M. Höpfner;H. Fischer;N. Glatthor;U. Grabowski;S. Kellmann;M. Kiefer;A. Linden;M. López‐Puertas;M. Milz;T. Steck;D. Y. Wang
[1]利用欧洲环境卫星（ENVISAT）搭载的被动大气探测迈克尔逊干涉仪（MIPAS）在2002年9 / 10月南极涡旋分裂期间测量的高分辨率大气翼发射光谱，反演了活性氮HNO3、ClONO2、NO、NO2和N2O5。这里研究了决定NOy亏损和分配的化学和运输过程。除9月22 ~ 27日期间400 ~ 475 K之间NOy以HNO3和ClONO2形式为主外，极涡中NOy以HNO3和NOx形式存在于平流层下层。平流层下部的主导过程是HNO3的光解作用增强，导致涡旋分裂期间NOx的稳定增加。随着涡旋向低纬度和中纬度移动，开始了增强的光解作用。在10月中旬极地涡旋重新定位后，HNO3的积累证实了这一观察结果。在9月22-27日期间，随着HNO3光解作用对NOx的增强，涡内N2O5增加到625 K以上。在475 K水平上，整个时间内涡旋内部NOy体积混合比（VMR）比由其代理的初冬出口涡关系得到的参考值低约12.5 ppbv。人工参考线性示踪法表明，准水平混合和涡旋分裂前的反硝化对NOy亏损的贡献分别约为25%和75%。涡旋分裂后，混合作用的贡献增大到40-45%，反硝化作用的贡献减小到55-60%。准等熵混合线方法利用[CH4]:[N2O]涡旋散点图估计混合诱导NOy亏缺在涡旋分裂前为55-60%，在涡旋分裂后为62%。
[1] Reactive nitrogen species HNO3, ClONO2, NO, NO2, and N2O5 were retrieved from high resolution atmospheric limb emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board the European Environmental Satellite (ENVISAT) during the split of the southern polar vortex in September/October 2002. The chemical and transport processes determining the NOy deficit and partitioning are investigated here. Most of the available NOy in the polar vortex was in the form of HNO3 and NOx in the lower stratosphere except for the period 22–27 September when NOy was mostly in the form of HNO3 and ClONO2 between the 400 K and 475 K levels. The dominant process throughout the lower stratosphere was enhanced photolysis of HNO3 resulting in a steady increase of NOx during the split of vortex. The enhanced photolysis was initiated following the displacement of the vortex to low and midlatitudes. This observation was confirmed by the buildup of HNO3 after this period in mid-October following the vortex repositioning on the pole. N2O5 inside the vortex increased above the 625 K level during the 22–27 September period following the enhancement of NOx from HNO3 photolysis. On the 475 K level, the NOy volume mixing ratio (VMR) inside the vortex is lower than the reference value derived from its proxy early winter exvortex relation by about 12.5 ppbv during the whole period. The artificial reference linear tracer method suggests that the contribution to the NOy deficit due to quasi-horizontal mixing and denitrification before the split of vortex is approximately 25% and 75%, respectively. After the vortex split the contribution due to mixing increased to 40–45%, while that due to denitrification decreased to 55–60%. The quasi-isentropic mixing line approach uses [CH4]:[N2O] vortex scatterplots to estimate the mixing induced NOy deficit to be 55–60% before, and 62% after, the vortex split.