GROWTH OF NITRIC-ACID HYDRATES ON THIN SULFURIC-ACID FILMS

被引：36
|
作者：
IRACI, LT [1 ]
MIDDLEBROOK, AM [1 ]
WILSON, MA [1 ]
TOLBERT, MA [1 ]
机构：
[1] UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309
来源：
GEOPHYSICAL RESEARCH LETTERS | 1994年 / 21卷 / 10期
关键词：
D O I：
10.1029/94GL00916
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Type I polar stratospheric clouds (PSCs) are thought to nucleate and grow on stratospheric sulfate aerosols (SSAs). To model this system, thin sulfuric acid films were exposed to water and nitric acid vapors (1 - 3 x 10(-4) Torr H2O and 1 - 2.5 x 10(6) Torr HNO3) and subjected to cooling and heating cycles. FTIR spectroscopy was used to probe the phase of the sulfuric acid and to identify the HNO3/H2O films that condensed. Nitric acid trihydrate (NAT) was observed to grow on crystalline sulfuric acid tetrahydrate (SAT) films. NAT also condensed in/on supercooled H2SO4 films without causing crystallization of the sulfuric acid. This growth is consistent with NAT nucleation from ternary solutions as the first step in PSC formation.
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页码：867 / 870
页数：4
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