Aircraft measurements of the SO 2 distribution in the upper troposphere and lower stratosphere A. Roiger, H. Schlager, K. Wissmüller, H. Aufmhoff, F. Arnold.

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Aircraft measurements of the SO 2 distribution in the upper troposphere and lower stratosphere A. Roiger, H. Schlager, K. Wissmüller, H. Aufmhoff, F. Arnold DLR, Institute of Atmospheric Physics SSRiC Workshop 28 – 30 Oct 2013 Atlanta, GA, USA

CI-ITMS (Chemical Ionization – Ion Trap Mass Spectrometry) CO 3 - ion chemistry (e.g. Speidel et al., 2007) time resolution ~ 1-2 s detection limit ~ 10 pptv (10s) online isotopic calibration using 34 SO 2 → 3 aircraft campaigns (2010, 2012) → 10 aircraft campaigns ( ) Falcon: max. altitude ~12 km HALO: max. altitude ~15 km SO 2 measurements using CI - ITMS Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop >

Overview: SO 2 measurements (2004 – 2012) In total: 13 field campaigns ~ 480 flight hours Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop >

In-situ SO 2 vertical profiles: polar region & mid-latitudes Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > DC3 Kansas (USA), May 2012 BB (New Mexico) ASTAR Spitsbergen, April 2007 Norilsk smelter ~2500 kT/y (Fioletov et al., 2013) Norilsk smelter * INTEX W Europe, May-June 2006 Asian emissions - WCB outflow WCB outflow (NA, Asia) * ~2500 kT/y, Fioletov et al., 2013

Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > In-situ SO 2 vertical profiles: tropics copper smelters & deg. volcanoes* SCOUT N Australia, Nov-Dec 2005 AMMA West Africa, July 2006 TROCCINOX Brasil, Feb-Mar 2005 * ~4000 kT/y, Fioletov et al., 2013

Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > SCOUT N Australia, Nov-Dec 2005 AMMA West Africa, July 2006 SO 2 vertical profiles: in-situ measurements & EMAC model TROCCINOX Brasil, Feb-Mar 2005 EMAC: Jöckel et al., GMD, 2010

SO 2 distribution at altitudes between 8 – 12 km 5°x5° bins Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop >

MCS outflow (Fiedler, 2008) Canadian biomass burning volcano „Kasatochi“ (Jurkat et al., 2010) SO 2 distribution at altitudes between 8 – 12 km Asian emissions (Fiedler, 2008) + 5°x5° bins Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > Indonesian biomass burning

5°x5° bins SO 2 distribution at altitudes between 12 – 15km SO 2 typically ~10-30 pptv → In good agreement with MIPAS observations (Höpfner et al., ACPD, 2013) Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > Asian Monsoon outflow in Tropical Easterly Jet Asian Monsoon outflow in Tropical Easterly Jet

SO 2 in-situ observations in Asian Monsoon outflow EMAC analysis CO SO 2 O3

Roiger, A.> Aircraft measurements of SO 2 > SSiRC Workshop > SO 2 in-situ observations in Asian Monsoon outflow ESMVal flight 18 Sep 2012: Male – Larnaca Hysplit backward trajectories

SO 2 measurements onboard Geophysica M55 (StratoCLIM, summer 2015/2016) → Expected SO 2 mixing ratios: ~10-15 pptv → CIMS instrument to be integrated in MIPAS dome Outlook: Future SO 2 measurements SO 2 measurements onboard HALO (ACCRIDON, OMO – Asia) Höpfner et al., ACPD, 2013

Challenges o low detection limit needed (to be improved by a factor of 2 – 5) → zero baseline determination important o low pressure, automatization Achievements o First detailed in-situ SO 2 measurements above 15km (between km only one single observation reporting SO 2 estimates) o Horizontal and vertical variability of SO 2 → indications of fresh injections? o In combination with simultaneous H 2 SO 4 measurements estimates of OH possible Outlook: Future SO 2 measurements onboard Geophysica