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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >THE PRESENCE OF METASTABLE HNO3/H2O SOLID PHASES IN THE STRATOSPHERE INFERRED FROM ER 2 DATA
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THE PRESENCE OF METASTABLE HNO3/H2O SOLID PHASES IN THE STRATOSPHERE INFERRED FROM ER 2 DATA

机译：从ER 2数据推算的亚稳态HNO3 / H2O固体相的存在

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摘要

We present data to show that at least some of the observed polar stratospheric cloud (PSC) particles sampled by the ER 2 on January 20, 1989, during the Airborne Arctic Stratospheric Expedition (AASE 1) were composed of a water-rich HNO3/H2O solid phase. The PSC water content derived from the ER 2 data on this day is larger than that of nitric acid trihydrate (NAT), nitric acid dihydrate (NAD) or an aqueous ternary solution of H2SO4/HNO3/H2O. Here, we suggest that these particles were composed of a water-rich metastable HNO3/H2O solid phase and refer to such clouds as Type Ic PSCs, which are different from Type la (crystalline NAT or NAD particles) or Type Ib (aqueous ternary solution droplets) PSCs. Type 1c PSCs could either be crystalline (a higher hydrate of HNO3 and H2O) or amorphous, and the data analysis presented here cannot distinguish between these different solid phases. The observed PSC on this day could have been a mixture of water-rich HNO3-containing solid particles with liquid ternary droplets and/or NAT (NAD) aerosols. However a mixture of cloud particles composed of ternary solution droplets and NAT (NAD) aerosols is inconsistent with the data. A surface adsorption/reaction process occurring on frozen sulfate surfaces is suggested as a formation mechanism for Type Ic PSCs in the stratosphere. A possible mechanism for the formation of large HNO3-containing aerosols (NAT or NAD) starting with Type Ic PSCs is discussed. [References: 48]
机译：我们提供的数据表明，在机载北极平流层探险（AASE 1）期间，由ER 2于1989年1月20日采样的至少一些平流层极地云（PSC）粒子由富含水的HNO3 / H2O组成固相这一天从ER 2数据得出的PSC水分含量大于硝酸三水合物（NAT），硝酸二水合物（NAD）或H2SO4 / HNO3 / H2O的三元水溶液。在这里，我们认为这些粒子是由富含水的亚稳态HNO3 / H2O固相组成的，并被称为Ic PSCs云，与Ia型（晶体NAT或NAD粒子）或Ib型（三元水溶液）不同液滴）PSC。 1c型PSC可能是晶体（HNO3和H2O的水合物含量较高）或非晶态，此处提供的数据分析无法区分这些不同的固相。在这一天观察到的PSC可能是富含水的HNO3固体颗粒与液体三元液滴和/或NAT（NAD）气溶胶的混合物。但是，由三元溶液液滴和NAT（NAD）气溶胶组成的云颗粒混合物与数据不一致。有人认为，在冷冻的硫酸盐表面上发生的表面吸附/反应过程是平流层中Ic型PSC的形成机理。讨论了从Ic型PSC开始形成大型含HNO3的气溶胶（NAT或NAD）的可能机制。 [参考：48]

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