1. Atmospheric Chemistry Experiment, ACE: Status and Spectroscopic Issues Peter Bernath, Nick Allen, Gonzalo Gonzalez Abad, Jeremy Harrison, Alex Brown, and Keith Tereszchuk (University of York, UK) Chris Boone (University of Waterloo, Canada)

2. Topics 1.HCN in Asian Monsoon 2.ACE solar & atmospheric atlases 3.Organics: ethane, propane, acetone, methanol, acetaldehyde, acetonitrile (etc.) 4.Halogenated gases

3. ACE Satellite Bernath et al., GRL, 32, L15S01 (2005) http://www.ace.uwaterloo.ca/

4. Solar Occultation Advantages: Radiance of sun gives higher S/N than emission Limb view gives longer path length ~500 km (lower detection limits) than nadir “Self-calibrating” so excellent long-term accuracy and precision Disadvantages: Modest global coverage Samples only free troposphere

5. Optical Layout (ABB-Bomem)

6. Atmospheric Dynamics: Asian Summer Monsoon Anticyclone At 13.5 km in altitude, HCN is high over Tibet because of rapid lofting of polluted air from India and China during summer; it is lower over the Pacific Ocean because of deposition and destruction in the ocean. Randel et al., Science 328, 611 (2010).

8. Fox News

10. ACE solar spectrum (F. Hase): 224782 spectra added, improvement over ATMOS, no telluric lines, but 0.02 cm -1 vs 0.01 cm -1 resolution (resolution largely determined by width of solar lines) and 750-4400 cm -1 vs 600-4800 cm -1. CO, Δv=1 OH CO Δv=2 CH, NH, OH ACE Solar Spectrum Hase et al. JQSRT 111, 521 (2010) OH: Bernath & Colin, JMS 257, 20 (2009) & HITRAN2008; NH: Ram & Bernath JMS 260, 115 (2010) Used in Leicester for IASI CO retrievals

11. CH Bands in ACE Solar Spectrum CH: Colin & Bernath, JMS (submitted)

12. ACE Atmospheric Atlases R. Hughes, in progress Five average atmospheres: Tropics, Mid Latitude Summer (MLS), MLW, Arctic Summer (AS), AW For each atmosphere a plot for troposphere, stratosphere, mesosphere, lower thermosphere (plus digital data for all tangent heights) Spectra have now been wavenumber calibrated and apodized (8-12 km, MLW)

13. VOCs and Air Quality Volatile Organic Compounds (VOCs) lead to the production of tropospheric ozone, a pollutant.

14. Molecular Spectroscopy Facility at Rutherford Appleton Lab Bruker IFS 125 HR, with short path and long path coolable cells

15. Ethane, Propane and Acetone (3 micron region) Harrison et al., JQSRT 111, 357-363 (2010) Harrison & Bernath, JQSRT 111, 1282 (2010) Harrison et al., JQSRT; two papers LW (in prep.) and SW (submitted) regions

16. Methanol, Acetaldehyde, Acetonitrile (3 micron region) To be recorded at RAL, July 2010 Tereszchuk & Bernath, JQSRT (in preparation) Time requested at RAL (Spectra recorded at York)

17. CH 4 Interferes with Hydrocarbons near 3.3 µm: Non-Voigt lineshapes needed CH 4 lines 8-12 km tropical average Harrison & Bernath, JQSRT 111, 1282 (2010)

18. ACE-FTS spectrum near 25 km (ss11613) Residuals for all measurements between 10 and 35 km on a common plot. Line mixing parameters for lines in the CH 4 3 P(9) manifold were derived from the ACE-FTS spectra using the Rosenkranz first order approximation. Failing to account for CH 4 line mixing affects the apparent baseline near the HCl line, generating errors when this line is employed in HCl retrievals.

19. Halogen Budget and Trends Species Global Warming Potential (20 year time horizon) Carbon Dioxide1 Methane72 Nitrous Oxide289 CFC - 116,730 CFC - 1211,000 CFC - 1136,540 Carbon Tetrachloride2,700 HCFC - 225,160 HCFC - 141b2,250 HCFC - 142b5,490 HFC - 134a3,830 Sulphur Hexafluoride16,300 Carbon Tetrafluoride (PFC - 14) 5,210 Retrievals v. 3: CFC-11, CFC-12, CFC-113, HCFC- 22, HCFC-141b, HCFC-142b, CCl 4, CH 3 Cl, CF 4, SF 6, (HFC-134a), F 2 CO, ClFCO, Cl 2 CO, HCl, HF, ClONO 2, (ClO)

20. CFC-12 HCFC-22 SF 6 HCFC-142b

21. Search for Earth-like Extrasolar Planets Recent launch of NASA’s Kepler mission will lead to the detection of other Earth-like planets.