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Tomás Sherwen (a) *, Mathew Evans (a,b), Lucy Carpenter (a) Rainer Volkamer (c), Theodore Koenig (c), Barbara Dix (c), Carlos Ordonez (d), Alfonso Saiz-Lopez.

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Presentation on theme: "Tomás Sherwen (a) *, Mathew Evans (a,b), Lucy Carpenter (a) Rainer Volkamer (c), Theodore Koenig (c), Barbara Dix (c), Carlos Ordonez (d), Alfonso Saiz-Lopez."— Presentation transcript:

1 Tomás Sherwen (a) *, Mathew Evans (a,b), Lucy Carpenter (a) Rainer Volkamer (c), Theodore Koenig (c), Barbara Dix (c), Carlos Ordonez (d), Alfonso Saiz-Lopez (e) Iodine’s Impact on Tropospheric Oxidants *ts551@york.ac.uk 1 a Wolfson Atmospheric Chemistry Laboratory (WACL), Department of Chemistry, University of York, UK b National Centre for Atmospheric Science (NCAS), Department of Chemistry, University of York, UK c Cooperative Institute for Research in Environmental Sciences (CIRES), Department of Chemistry and Biochemistry, University of Colorado, CO, USA d Met Office, FitzRoy Road, Exeter, UK e Atmospheric Chemistry and Climate Group (AC2), Instituto de Química Física Rocasolano, CSIC, Madrid, Spain

2 Halogens and O 3 Tropospheric O 3  Sources NO x / VOCs  Sinks Depositional Chemical (H 2 O/ hv / HOx …+ halogens) Troposphere Halogens  More labile source species  Cl, Br, I  History 2 Image: WHO, 2010

3 Aerosols Schematic HOI I2I2 I - CH 3 ICH 2 I 2 CH 2 IBrCH 2 IClIOII2OxI2Ox OIO IONO 2 HOI O 3 Deposition I2I2 IONO HI MicroalgaeMacroalgae 0.110.260.050 0.18 0.30 I - 2.0 Dry Deposition Wet Deposition

4 Modelled Iodine Partitioning 4 Emissions Organic 0.6 Tg Organic 0.6 Tg (CH 3 I, CH 2 IX) Inorganic 2.4 Tg Inorganic 2.4 Tg (HOI, I 2 ) % pptv

5 Inorganic Observations 5

6 O 3 Decrease 6

7 O 3 loss by Route 7

8 OH Increase 8 OH O3O3 IO +HO 2 OH O3O3 IO +HO 2

9 O 3 for better or for worse - Daily change from maximum - Normalised to mean - Tropical Atlantic site - (Cape Verde) 9

10 Pollution Feedback Net O 3 loss ( photolysis driven) Interaction with NOx 10

11 Summary O 3, HO 2 concentrations  with halogens OH  with iodine 11 Tomás Sherwen ( ts551@york.ac.uk ) Scenario O 3 Burden ( Tg ) [OH] mean ( 1x10 5 molec. cm -3 ) v9-2 (no Bromine)39012.8 v9-2 (inc. Bromine)36712.2 % diff from “no halogens”-6.0-4.3 + Iodine33412.5 % diff from “no halogens”-14-2.6 % diff from v9-2 -9.0 (3.3- 9.7) 1.8 (0.3-1.9) ( net: OH  with halogens )

12 Extra Slide 1 - Sondes 12

13 Extra Slide 2 - % O 3 zonal change 13

14 Extra Slide 3 - % O 3 spatial change 14

15 Extra Slide 4 - % O 3 column change 15

16 Extra Slide 5 - % O 3 EU spatial change 16

17 OH O3O3 IO +HO 2 OH O3O3 IO +HO 2 Extra Slide 6 - OH delta explanation

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