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Constraining the N 2 O budget using isotopologues and isotopomers

B41G-02 (AGU 2007). Yung et al ., Constraining the N2O budget using isotopologues and isotopomers. Constraining the N 2 O budget using isotopologues and isotopomers. Y. L. Yung, S. P. Kim, M. C. Liang and R. L. Shia Divisions of Geological and Planetary Sciecnes

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Constraining the N 2 O budget using isotopologues and isotopomers

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  1. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers Constraining the N2O budget using isotopologues and isotopomers Y. L. Yung, S. P. Kim, M. C. Liang and R. L. Shia Divisions of Geological and Planetary Sciecnes California Institute of Technology B41G-02 AGU - Dec 13, 2007 (Thur)

  2. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers Method 14N14N16O (446) 14N15N16O (456) 15N14N16O (546) 14N14N18O (448)

  3. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers Known Sources

  4. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers The Adjoint Method • Goal: Calculate the gradient of a cost function with respect to initial control variables. • Steps: • 1. Linearize the model • 2. Transpose the linear model

  5. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers Tangent linear and Adjoint Model Compiler (TAMC) • Created for Fortran 77 with some extensions for 90/95 • Automatic generation of adjoint code • Takes top-level routine and creates adjoint routines • Follows all guidelines in Giering (1998) • Examples • MIT ocean model • Hamburg Ocean Primitive Equation Model (HOPE) • Tracer Model (TM2)

  6. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  7. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  8. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  9. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  10. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  11. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  12. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers

  13. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers What is the uncertainty of this budget projection?

  14. B41G-02 (AGU 2007) Yung et al., Constraining the N2O budget using isotopologues and isotopomers Conclusions • The IPCC 2007 N2O budget appears to be consistent with the isotopic data • Isotopic analysis narrows uncertainty range of the model budget • Extend the model to the pre-industrial revolution • Site preference data for 15N provides the most sensitive discrimination between natural and anthropogenic sources of N2O.

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