1. OMI Blue Team Review, March 11, 2008 THE 1982 EL CHICHON ERUPTION: The Birth of Volcanic Sulfur Dioxide Monitoring from Space Krueger, AJ, “Sighting of El Chichon Sulfur Dioxide Clouds with the Nimbus 7 Total Ozone Mapping Spectrometer”, Science, 1983. 2006: Aura – “Top 10 discoveries” OMI monitors smelter SO 2 emissions Carn, S. A., et al, “Sulfur dioxide emissions from Peruvian copper smelters detected by the Ozone Monitoring Instrument, Geophys. Res. Lett”, 2007 ~100 times improved sensitivity Ozone and sulfur dioxide Ilo copper smelter La Oroya copper smelter Ecuador/S. Colombia volcanoes

2. OMI Blue Team Review, March 11, 2008 Current status OMSO2 v1.1.1 Public OMSO2 algorithm uses V8.5 TOMS ozone algorithm data Improvements arising from use of RR cloud top heights (OMCLDRR) - previous OMSO2 used TIR-derived cloud height climatology Four SO 2 retrievals based on a-priori SO 2 vertical profiles or center of mass altitude [CMA]: –Planetary Boundary Layer (PBL): CMA = 0.9 km –Lower tropospheric column (TRL): CMA = 2.5 km –Mid-tropospheric column (TRM): CMA = 7.5 km –UTLS column (STL): CMA = 17 km Limited validation of PBL [NE China] and STL [AIRS,TOMS] data to date Volcanic degassing is the principal source of SO 2 in TRL-TRM data N. Krotkov (PI) K. Yang (algorithm development/ implementation) S. Carn (science/validation/applications) A. Krueger (PI, NRT volcanic data for aviation warning)

3. OMI Blue Team Review, March 11, 2008 Improvements arising from use of RR cloud top heights Previous TIR cloud top pressure climatology *Positive cloud noise ~1 DU is removed using RR cloud pressure Negative SO 2 above bright clouds requires further improvements ITCZ clouds over Pacific Ocean

4. OMI Blue Team Review, March 11, 2008 AURA’s Ozone monitoring instrument (OMI) can detect smaller amounts of SO 2 at higher spatial resolution than any previous satellite instrument Designed by B. Schoeberl Anatahan Volcano Soufriere Hills Volcano Sierra Negra Volcano Ambrum Volcano Nyiragongo Volcano, DR Congo Coal Power Plants, South Africa Norilsk Nickel Smelter Coal Power Plants, China Oil Refineries OMI allows us to compare man- made SO 2 emissions with natural sources (volcanoes)

5. OMI Blue Team Review, March 11, 2008 Long-term SO 2 burdens over USA, Europe and China East-Aire’05 experiment 25.5 million tons of SO2 was emitted by Chinese factories in 2005 up 27% from 2000

6. OMI Blue Team Review, March 11, 2008 - Noise ~1.5DU for ideal conditions (near nadir view, no clouds). Only plumes from strong anthropogenic sources of SO2 (such as smelters and coal burning power plants) and from strong regional pollution can be detected in pixel data. - Operational SO2 data need off-line correction for total ozone, SO2 profile, viewing geometry, clouds and aerosol effects. OMI SO 2 burdens need cloud, aerosol and realistic SO 2 profile correction !! Daily anthropogenic PBL data

7. OMI Blue Team Review, March 11, 2008 PBL product CMA = 0.9 km Future work: –Use on-line GOES-5 SO 2 profile shape forecasts to account for SO2 lofting during long-range transport above PBL –Use A-train cloud and aerosol data to correct AMF AMF= 0.3-0.4 SO 2 sensitivity Current data: –BRD algorithm [Krotkov et al 2006] –should be used only under optimal viewing conditions –constant AMF for CMA ~0.9 km AMF= 1 -2

8. OMI Blue Team Review, March 11, 2008 Off-line AMF corrections for ozone, geometry and aerosols Current data require o ff-line AMF corrections for geometry, total ozone and aerosols. Future work: –Measuring aerosol absorption in the UV wavelengths from ground[ N.Krotkov, J.Herman ] –Use A-train cloud and aerosol data to correct AMF for mixed aerosol- cloudy scenes

9. OMI Blue Team Review, March 11, 2008 Volcanic tropospheric data Current data –Linear Fit algorithm [Yang et al 2007] –The users can use the center of mass altitude (CMA) derived from SO 2 vertical distribution to interpolate between the TRL (CMA=2.5km) and TRM (CMA=7.5km) values. Future algorithm –Provide AK depending on OMI cloud information –Better cloud information will be used from advanced A-train cloud-products

10. OMI Blue Team Review, March 11, 2008 Volcanic Stratospheric (STL) data Earth Probe TOMS (11:00 am) Aqua AIRS (1:30 pm) Current data: – LF algorithm [Yang et al 2007] –OMI STL data continue 25+ years of TOMS volcanic data, but improved sensitivity extends the range of detection to smaller eruptions and older clouds –LF algorithm underestimates large eruptions > 100DU –A-train allows independent retrievals in UV/VIS/IR. –Volcanic cloud SO 2 burdens (<100DU) agree to within 20% Future work: –Non-linear iterative retrieval for largest eruptions (Pinatubo) Aura OMI (1:45 pm)

11. OMI Blue Team Review, March 11, 2008 Data users: close collaboration Anthropogenic SO 2 GSFC: Mian Chin - GOCART modeling of the global sulfate cycle, aerosol pollution, effects on surface radiation (global dimming); UMCP: R. Dickerson, Can Li, Z. Li: Air quality and tropospheric chemistry studies; understanding long- range pollution transport. Dalhousie University : Aaron van Donkelaar, Randall Martin: Long-range Transport of Asian Sulfur Emissions NSF-VOCALS team: Effects of sulfur emissions in South America on the Southeast Pacific climate system U-Thessaloniki, Greece (Sulfur emissions in Eastern Europe) Volcanic SO 2 NRT Volcanic Applications: NASA CAN for NRT volcanic cloud data for aviation hazards – A. Krueger NOAA/NESDIS - G. Serafino, G. Vicente Volcanic Ash Advisory Centers (VAACs) European SACS BIRA/IASB NRT SO2 web site USGS Volcano observatories: Alaska (AVO), Cascades (CVO), Hawaii (HVO) Kamchatka Volcanic Eruption Response Team (KVERT), Petropavlovsk-Kamchatsky, Russia Instituto Geofisico, Quito, Ecuador INGEOMINAS, Colombia Goma Volcano Observatory, DR Congo IRD, Noumea, New Caledonia (monitoring volcanoes in Vanuatu) GNS Science, New Zealand AQ Applications: U-Iowa and ANL: Air Quality Emission inventory and Air quality forecast DSS (PI: Carmichael and Styreets ; Ken Pickering, GSFC): comparing USA and Chinese emissions using regional models and OMI data;

12. OMI Blue Team Review, March 11, 2008 GES DISC Data Distribution Statistics (based on Total Number of Users in Year 2007) All Others (in order of number of Users): Canada, International treaty Organizations, Commercial (.com), Netherlands, Greece, New Zealand, Chile, Belgium, Israel, Colombia, Spain, Italy, Estonia, China, Switzerland, Ecuador, Norway, Japan, Total SO2 Users in Year 2007: 900 (based on visitors who showed activity of more than 1 minute at the SO2 FTP Data Directory site) Total Number of Page Hits at SO2 FTP Directory (excluding Search & Robot Engines) = 2.1 millions in 2007 1. Unresolved 2. USE educational 3. Russian Federation 4. US Government 5. Network (.net) 6. India 7. Germany 8. France 9. United Kingdom 10. Indonesia All others

13. OMI Blue Team Review, March 11, 2008 Summary of research with released data: Carn, S. A., et al (2007a), Sulfur dioxide emissions from Peruvian copper smelters detected by the Ozone Monitoring Instrument, Geophys. Res. Lett., Carn, S.A., et al (2007b), Extended observations of volcanic SO2 and sulfate aerosol in the stratosphere, Atmos. Chem. Phys. Discuss., 7, 2857-2871. Dickerson, R. et al (2007), Aircraft observations of dust and pollutants over NE China: Insight into the meteorological mechanisms of long-range transport, J. Geophys. Res.- EAST-AIRE special session, December 2007 Krotkov, N.A., et al (2008), Ozone Monitoring Instrument (OMI) SO 2 validation over NE China, J. Geophys. Res., (in press) Carn, S.A., et al (2008a, Daily monitoring of Ecuadorian volcanic degassing from space, J. Volcanol. Geotherm. Res., (in press). Carn, S.A., et al (2008b), Tracking volcanic sulfur dioxide clouds for aviation hazard mitigation. Natural Hazards, Special Issue on Aviation Hazards from Volcanoes ~18 presentations at AGU, EGU, ENVISAT, OMI ST, Aura ST, Cities on Volcanoes 4,5, >10 stories on Earth Observatory web site (Simon Carn), NASA OMI SO2 poster very popular (courtesy to Mark and Barbara Schoeberl ), PBS TV program

14. OMI Blue Team Review, March 11, 2008 Validation SO2 Aerosol -AVDC - overpass data sets for ~50 power plants and Brewer locations – Bojan Bojkov -New DOAS mini-spectrometers (PANDORA near pollution sources – Jay Herman & A. Cede, NOVAC near volcanoes– Bo Galle & S. Carn) -SO 2 balloon (UMCP- R. Dickerson and UMCP student project ) -In-situ aircraft (EAST-AIRE- China2005; TC4 South America 2007; …) OMI SO 2

15. OMI Blue Team Review, March 11, 2008 GOCART model comparisons On April 7, 2005, OMI detected SO 2 pollution plume inland and off-shore of China, as well as volcanic plume from Anatahan Volcano (top left panel). The GOCART model reproduces similar SO 2 distributions (top right), as well as predicts the amount of sulfate that is produced from SO 2 oxidation (bottom right). Future work: Use on-line GOCART (GEOS-5) forecasts of SO2 and aerosol profile shapes Use GOCART aerosol composition data for AMF corrections Sulfate (DU) from GOCART on 04/07/2005 SO 2 (DU) from GOCART on 04/07/2005 Pollution Volcano Pollution Volcano SO 2 (DU) from OMI on 04/07/2005 30N 20N 10N 40N 50N 100E 110E 120E 130E 140E 150E 4.00 3.64 3.28 2.92 2.56 2.20 1.84 1.48 1.12 0.78 0.40 DU

16. OMI Blue Team Review, March 11, 2008 Activities: 2008-2009 New Spectral Fit algorithm Better stray light and Ring corrections Using SO 2 profiles from GEOS-5 model Activities: 2010-2011 Better aerosol and cloud correction using A- train data and improvements based on comparison with models and measurements. Activities: 2012- algorithm improvements to account for changes in instrument performance Transition to future instruments