6533b85afe1ef96bd12b8c96
RESEARCH PRODUCT
Nitric Acid Trihydrate (NAT) formation at low NAT supersaturation in Polar Stratospheric Clouds (PSCs)
Paul StockCornelius SchillerG. ShurB. P. LuoH. VössingAnke RoigerStephan BorrmannStephan BorrmannPaul KonopkaThomas PeterChristiane VoigtHans SchlagerAndreas DörnbrackJoachim CurtiusS. Daviessubject
Atmospheric Science010504 meteorology & atmospheric sciencesAnalytical chemistryNucleation010402 general chemistryAtmospheric sciences01 natural scienceslcsh:Chemistrychemistry.chemical_compoundNitric acidStratosphere0105 earth and related environmental sciences[SDU.OCEAN]Sciences of the Universe [physics]/Ocean AtmosphereSupersaturationChemistrylcsh:QC1-9990104 chemical sciencesThe arcticozonelcsh:QD1-99913. Climate actionNatpolar stratospheric cloud (PSC)PolarSaturation (chemistry)nitric acid trihydrate (NAT)lcsh:Physicsdescription
International audience; A PSC was detected on 6 February 2003 in the Arctic stratosphere by in-situ measurements onboard the high-altitude research aircraft Geophysica. Low number densities (~10-4cm-3) of small nitric acid (HNO3) containing particles (dTNAT, these NAT particles have the potential to grow further and to remove HNO3 from the stratosphere, thereby enhancing polar ozone loss. Interestingly, the NAT particles formed in less than a day at temperatures just slightly below TNAT (T>TNAT-3.1K). This unique measurement of PSC formation at extremely low NAT saturation ratios (SNAT?10) constrains current NAT nucleation theories. We suggest, that the NAT particles have formed heterogeneously, but for certain not on ice. Conversely, meteoritic particles may be favorable candidates for triggering NAT nucleation at the observed low number densities.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-06-08 |