Nucleation rates of nitric acid dihydrate in 1 : 2 HNO3/H2O solutions at stratospheric temperatures

Authors
Salcedo, D Molina, LT Molina, MJ
Citation
D. Salcedo et al., Nucleation rates of nitric acid dihydrate in 1 : 2 HNO3/H2O solutions at stratospheric temperatures, GEOPHYS R L, 27(2), 2000, pp. 193-196
Citations number
21
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL RESEARCH LETTERS
ISSN journal
00948276 → ACNP
Volume
27
Issue
2
Year of publication
2000
Pages
193 - 196
Database
ISI
SICI code
0094-8276(20000115)27:2<193:NRONAD>2.0.ZU;2-B
Abstract
Nucleation rates of nitric acid dihydrate (NAD) in 1:2 HNO3/H2O solutions b etween 194 and 183 K were measured by observing the freezing behavior of li quid drops with 7 - 33 mu m diameter and with concentration of 64 weight pe rcent HNO3 using an optical microscopy technique. The nucleation rate incre ases from 3.1x10(5)cm(-3)s(-1) at 194 K to 1.3x10(9)cm(-3)s(-1) at 183 K. T hese results suggest that NAD might not nucleate homogeneously in binary or quasi-binary nitric acid stratospheric aerosols in relevant time scales.