Nitric acid trihydrate (NAT) in polar stratospheric clouds

C Voigt, J Schreiner, A Kohlmann, P Zink… - Science, 2000 - science.org
A comprehensive investigation of polar stratospheric clouds was performed on 25 January
2000 with instruments onboard a balloon gondola flown from Kiruna, Sweden. Cloud layers …

Spectroscopic evidence against nitric acid trihydrate in polar stratospheric clouds

OB Toon, MA Tolbert - Nature, 1995 - nature.com
HETEROGENEOUS reactions on polar stratospheric clouds (PSCs) play a key role in the
photochemical mechanism thought to be responsible for ozone depletion in the Antarctic …

Chemical analysis of polar stratospheric cloud particles

J Schreiner, C Voigt, A Kohlmann, F Arnold… - Science, 1999 - science.org
A balloon-borne gondola carrying a particle analysis system, a backscatter sonde, and
pressure and temperature sensors was launched from Kiruna, Sweden, on 25 January …

The Detection of Large HNO3-Containing Particles in the Winter Arctic Stratosphere

DW Fahey, RS Gao, KS Carslaw, J Kettleborough… - Science, 2001 - science.org
Large particles containing nitric acid (HNO3) were observed in the 1999/2000 Arctic winter
stratosphere. These in situ observations were made over a large altitude range (16 to 21 …

Chlorine chemistry on polar stratospheric cloud particles in the Arctic winter

CR Webster, RD May, DW Toohey, LM Avallone… - Science, 1993 - science.org
Simultaneous in situ measurements of hydrochloric acid (HCl) and chlorine monoxide (ClO)
in the Arctic winter vortex showed large HCl losses, of up to 1 part per billion by volume …

Heterogeneous reactions on nitric acid trihydrate

SB Moore, LF Keyser, MT Leu, RP Turco, RH Smith - Nature, 1990 - nature.com
HETEROGENEOUS reactions on the surfaces of polar stratospheric cloud particles1–4 are
now known to have a crucial role in the springtime decrease of polar ozone5, 6 by …

Reaction of chlorine nitrate with hydrogen chloride and water at Antarctic stratospheric temperatures

MA Tolbert, MJ Rossi, R Malhotra, DM Golden - Science, 1987 - science.org
Laboratory studies of heterogeneous reactions important for ozone depletion over Antarctica
are reported. The reaction of chlorine nitrate (ClONO2) with H2O and hydrogen chloride …

Role of the stratospheric polar freezing belt in denitrification

A Tabazadeh, EJ Jensen, OB Toon, K Drdla… - Science, 2001 - science.org
Homogeneous freezing of nitric acid hydrate particles can produce a polar freezing belt in
either hemisphere that can cause denitrification. Computed denitrification profiles for one …

Physical Chemistry of the H2SO4/HNO3/H2O System: Implications for Polar Stratospheric Clouds

MJ Molina, R Zhang, PJ Wooldridge, JR McMahon… - Science, 1993 - science.org
Polar stratospheric clouds (PSCs) play a key role in stratospheric ozone depletion. Surface-
catalyzed reactions on PSC particles generate chlorine compounds that photolyze readily to …

Vapor pressures of solid hydrates of nitric acid: Implications for polar stratospheric clouds

DR Worsnop, MS Zahniser, LE Fox, SC Wofsy - Science, 1993 - science.org
Thermodynamic data are presented for hydrates of nitric acid: HNO3⋅ H2O, HNO3⋅ 2H2O,
HNO3⋅ 3H2O, and a higher hydrate. Laboratory data indicate that nucleation and …