Laboratory simulations of PSC particle formation
Laboratory simulations of PSC particle formation
复制标题
PSC 颗粒形成的实验室模拟
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
K. Mauersberger
中科院分区：
文献类型：
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作者：
James J. Marti;K. Mauersberger
最近对I型极地平流层云粒子（PSC I）的观测揭示了与实验室研究中获得的硝酸三水合物（NAT）数据的一些差异。为了更好地了解PSC I粒子的原位生长，本实验在比先前研究更接近极地平流层的温度和压力下冷凝水和硝酸蒸汽的混合物。单，二，和三水合物的硝酸中观察到的固体冷凝蒸汽混合物相对丰富的硝酸。在接近平流层的条件下形成的固体含有比NAT预期的25mol%显著更少的HNO 3;组成似乎在大约10小时内缓慢地向NAT变化。具有低硝酸含量的固体显示硝酸蒸气压，往往是高度过饱和相对于NAT。这些结果可能有助于解释最近的北极PSC观测相对年轻的云，其凝结的材料尚未达到平衡。
Recent observations of type I polar stratospheric cloud particles (PSC I) reveal some discrepancies with data on nitric acid trihydrate (NAT) obtained in laboratory studies. To better understand the in situ growth of PSC I particles, this experiment condensed mixtures of water and nitric acid vapor at temperatures and pressures which approximated those of the polar stratosphere more closely than in prior studies. Mono-, di-, and trihydrates of nitric acid were observed in solids condensed from vapor mixtures relatively rich in HNO3. Solids formed under conditions that approached stratospheric contained significantly less HNO3 than the 25 mol% expected of NAT; the composition appeared to slowly change toward that of NAT over about ten hours. Solids with low HNO3 content showed HNO3 vapor pressures that were often highly supersaturated with respect to NAT. These results may help explain recent arctic PSC observations as those of relatively young clouds whose condensed materials have not yet reached equilibrium.