Uptake of HNO3 on ice under upper tropospheric conditions

Details Uptake of HNO3 on ice under upper tropospheric conditions Uptake of HNO3 on ice under upper tropospheric conditions

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1391z&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 11, p. 1391-1394

Physics

48

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Constituent Sources And Sinks

Scientific paper

The uptake of HNO3 on thin ce films was investigated under upper tropospheric temperature and pressure conditions using a Knudsen cell reactor and FTIR reflection-absorption spectroscopy. Two different HNO3 uptake regimes were noted with the critical threshold being the supercooled H2O/HNO3 liquid isotherm at a specific temperature. For H2O/HNO3 partial pressures below the supercooled H2O/HNO3 liquid isotherm, a time-dependent uptake of HNO3 was observed until the HNO3 surface coverage reached approximately one monolayer. The initial uptake coefficient of HNO3 on the ice film was γ>=0.005 which became progressively smaller until a steady-state uptake coefficient of γ=0.0002+/-0.0001 was obtained after monolayer coverage of HNO3. In contrast, when H2O and HNO3 partial pressures were greater than the supercooled H2O/HNO3 isotherm, unlimited uptake of HNO3 was observed with an uptake coefficient γ>=0.005. Under these conditions, the infrared spectra showed the formation and continual growth of a supercooled H2O/HNO3 liquid. By using the best estimates of HNO3 mixing ratios and ice surface area densities in the upper troposphere, two limiting cases of HNO3 uptake are discussed in the context of upper tropospheric chemistry.

Affiliated with

Also associated with

No associations

Rating

Uptake of HNO3 on ice under upper tropospheric conditions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Uptake of HNO3 on ice under upper tropospheric conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Uptake of HNO3 on ice under upper tropospheric conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1473884