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Photochemical processes on Titan

Photochemical processes on Titan. A Revision from Cassini Observations Cheng Li, X. Zhang, J. A. Kammer , M. C. Liang, Y. L. Yung. 1California Institute of Technology 2Research Center for Environmental Changes, Academia Sinica, Taiwan. 2. P ho t o c h em is tr y o n Ti tan.

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Photochemical processes on Titan

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  1. Photochemical processes on Titan A Revision from Cassini Observations Cheng Li, X. Zhang, J. A. Kammer, M. C. Liang, Y. L. Yung 1California Institute of Technology 2Research Center for Environmental Changes, Academia Sinica, Taiwan

  2. 2 PhotochemistryonTitan C2H2, C2H4,C2H6 C2H,C2H3,… C3Hx, C4Hx,… CH,1CH2,3CH2 CH3 N+,N,N+ 2 e-­‐ CH4 N2 surface

  3. 4 C2H2 formation/destruction pathway

  4. 5 CIRS limb view and FUV stellar occultation C2H2 C2H4 C2H6 CH4 CH3CCH C3H8 C4H2 C6H6 Altitude (km) Mixing ratio Vinatier et al., 2009; Kammer et al., 2011

  5. No Methane escape, Koo=108 cm2s-1

  6. 7 Retrieval algorithm 1000 C2H2 altitude Mixing ratio Levenberg–Marquardt

  7. 8 Molecular diffusivity Initial guess Retrieved eddy diffusivity

  8. Vinatier et al., 2009; Kammer et al., 2011; Yelle et al., 2008 9

  9. Vinatier et al., 2009; Kammer et al., 2011; Yelle et al., 2008 10

  10. Nixon et al. 2013

  11. Vinatier et al., 2009; Kammer et al., 2011; Yelle et al., 2008 12 Dashed Red: CH4 escape = 10(9) cm-2s-1 Koo = 1.5 x 10(7)cm2s-1 Solid Red: CH4 escape = 0 Koo = 1 x 10(8)cm2s-1

  12. 13 Conclusion

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