Do NAD and NAT form in liquid stratospheric aerosols by pseudoheterogeneous nucleation?

The Journal of Physical Chemistry. a
Daniel A Knopf

Abstract

Laboratory data of the freezing of nitric acid hydrates (NAD, NAT) from HNO(3)/H(2)O and HNO(3)/H(2)SO(4)/H(2)O solution droplets have been evaluated with respect to a "pseudoheterogeneous" (surface-induced) nucleation mechanism of NAD and NAT, which has been argued to possibly lead to the formation of polar stratospheric clouds (PSCs). In addition, a parametrization of pseudoheterogeneous nucleation of NAD and NAT suggested recently (Tabazadeh et al. J. Phys. Chem. A 2002, 106, 10238-10246) has been analyzed, showing that this parametrization should not be used in stratospheric modeling studies. The analysis of several laboratory data sets yields an upper limit of the pseudoheterogeneous nucleation rate coefficient of NAD of 2.2 x 10(-5) cm(-2) s(-1). In contrast, the upper limit of the pseudoheterogeneous nucleation rate coefficient of NAT could not be constrained satisfactorily, since formation of NAT has not been observed at stratospheric conditions in laboratory experiments applying small droplets. Maximum NAD production rates of 9.6 x 10(-9) cm(-3) (air) h(-1) in the stratosphere have been estimated assuming a pseudoheterogeneous nucleation mechanism that is constrained by the experimental observations. If maximum NAD sup...Continue Reading

References

Feb 12, 1999·Science·J SchreinerN Larsen
Jan 11, 2000·Science·C VoigtA Dörnbrack
Apr 3, 2001·Science·A TabazadehM R Schoeberl
Jul 13, 2006·The Journal of Physical Chemistry. a·Peter StöckelThomas Leisner
Jul 13, 2006·The Journal of Physical Chemistry. a·Giles W Turner, Lawrence S Bartell

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Citations

Oct 22, 2008·Annual Review of Physical Chemistry·Omar F SigurbjörnssonRuth Signorell
Mar 10, 2015·Chemical Reviews·John M C PlaneErin C M Dawkins
Dec 17, 2008·Physical Chemistry Chemical Physics : PCCP·Omar F SigurbjörnssonRuth Signorell
Jun 9, 2012·Chemical Society Reviews·John M C Plane
Jul 23, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Omar F Sigurbjörnsson, Ruth Signorell
Dec 20, 2014·Physical Review Letters·C W GurganusR A Shaw
Oct 16, 2009·The Journal of Physical Chemistry. a·Galen SedoKenneth R Leopold
Feb 1, 2007·The Journal of Physical Chemistry. a·Azadeh Tabazadeh

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