TY  - JOUR
AU  - Voigt, C.
AU  - Schlager, H.
AU  - Roiger, A.
AU  - Stenke, A.
AU  - de Reus, M
AU  - Borrmann, S.
AU  - Jensen, E.
AU  - Schiller, C.
AU  - Konopka, P.
AU  - Sitnikov, N.
TI  - Detection of reactive nitrogen containing particles in the tropopause region? Evidence for a tropical nitric acid trihydrage (NAT) belt
JO  - Atmospheric chemistry and physics
VL  - 8
SN  - 1680-7316
CY  - Katlenburg-Lindau
PB  - EGU
M1  - PreJuSER-2549
SP  - 7421 - 7430
PY  - 2008
N1  - The M55-Geophysica AMMA-SCOUT campaign in West Africa was funded by the Geophysica EEIG, French CNRS-INSU/CNES and European Community sixth framework integrated projects SCOUT-O3 (505390-GOCE-CT-2004) and AMMA-EU. Based on a French initiative, AMMA was built by an international scientific group and is currently funded by a large number of agencies, especially from France, UK, US and Africa. It has been the beneficiary of a major financial contribution from the European Community's Sixth Framework Research Programme. CV performed part of the work within the Junior Research Group AEROTROP and MdR acknowledges the support through the SFB641:TROPICE. We thank B. Luo, B. K archer, D. Fahey and T. Peter for fruitfull discussions. The Geophyisca crew is acknowledged for excellent flight operation and K. Law and F. Cairo for the coordination of the Geophysica campaign. The global model simulations have been performed on the NEC SX-6 high performance computer of the German Computing Centre (DKRZ). ECMWF data were provided by the European Centre for Medium Range Weather Forecasts.
AB  - The detection of nitric acid trihydrate (NAT, HNO3 x 3H(2)O) particles in the tropical transition layer (TTL) harmonizes our understanding of polar stratospheric cloud formation. Large reactive nitrogen (NOy) containing particles were observed on 8 August 2006 by instruments on-board the high altitude research aircraft M55-Geophysica near and below the tropical tropopause. The particles, most likely NAT, have diameters less than 6 mu m and concentrations below 10(-4) cm(-3). The NAT particle layer was repeatedly detected at altitudes between 15.1 and 17.5 km over extended areas of 9.5 to 17.2 degrees N and 1.5 degrees W to 2.7 degrees E above the African continent. Satellite observations suggest that the NAT particles could have nucleated on ice fed by convective activity. Once nucleated, the NAT particles can slowly grow within the TTL for days, while being transported over long distances. Their in-situ detection combined with global model simulations of the NAT supersaturation near the tropical tropopause indicate the potential for a tropical tropopause NAT particle belt.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000262411800008
UR  - https://juser.fz-juelich.de/record/2549
ER  -