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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Variation in PSC Occurrence Observed with ILAS-II over the Antarctic in 2003
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Variation in PSC Occurrence Observed with ILAS-II over the Antarctic in 2003

机译：2003年南极ILAS-II观测到的PSC发生率变化

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References(29) Supplementary materials(1) The Improved Limb Atmospheric Spectrometer (ILAS)-II frequently observed polar stratospheric clouds (PSCs) in the Southern Hemisphere (SH) throughout the winter of 2003. Simultaneous observations of the aerosol extinction coefficient (AEC) at 780 nm, nitric acid, and water vapor data were analyzed to investigate the ambient thermodynamic conditions associated with observed PSCs. PSCs were first observed with ILAS-II at the end of May, and observed most frequently in August/September as temperatures cooled. At approximately 20 km late in the PSC season, however, PSCs were less likely to occur, despite cold temperatures, because of the lower concentration of nitric acid due to denitrification caused by sedimentation of previously occurring PSCs. The probability of PSC occurrence and the probability of ambient temperatures colder than nitric acid trihydrate (NAT) saturation temperature (TNAT) were well correlated below -20 km throughout the winter. In contrast, PSC frequency at -22 km from late August to early September was low even when temperatures were sufficiently colder than TNAT; this is, at least, partly because of the decrease in background aerosol particles in the atmosphere.
机译：参考文献（29）补充材料（1）改进的肢体大气光谱仪（ILAS）-II经常在2003年整个冬季观察到南半球（SH）的极地平流层云（PSC）。同时观测到的气溶胶消光系数（AEC）在780 nm下，分析了硝酸和水蒸气数据，以研究与观察到的PSC相关的环境热力学条件。 PSC在5月底首次用ILAS-II观测到，在温度降低的8月/ 9月最常观察到。然而，在PSC季节后期约20 km处，尽管温度较低，但PSC不太可能发生，这是由于先前存在的PSC沉淀导致的反硝化作用导致硝酸浓度较低。在整个冬季，低于-20 km时，发生PSC的可能性与环境温度低于三水硝酸（NAT）饱和温度（TNAT）的可能性相关。相反，即使温度比TNAT足够冷，从8月下旬到9月初的-22 km的PSC频率也很低。这至少部分是由于大气中背景气溶胶颗粒的减少。

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