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Xinyu Wen & Zhengyu Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Isotope Simulation of the Evolution of East Asian Monsoon since the LGM: A Preliminary Analysis 对 LGM 以来同位素气候模拟的初步分析. Xinyu Wen & Zhengyu Liu Dept of Atmospheric and Oceanic Sciences, Peking University Contributors: Esther Brady & Otto- Bliesner Bette CCR/CGD, NCAR

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Xinyu Wen & Zhengyu Liu Dept of Atmospheric and Oceanic Sciences, Peking University

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  1. Isotope Simulation of the Evolution of East Asian Monsoon since the LGM: A Preliminary Analysis 对LGM以来同位素气候模拟的初步分析 Xinyu Wen&Zhengyu Liu Dept of Atmospheric and Oceanic Sciences, Peking University Contributors: Esther Brady &Otto-Bliesner Bette CCR/CGD, NCAR Jun/29/2012 @ Nanjing

  2. Overview • Model-Data Comparison • Interpretation of d18O • Appropriate Indices for Paleo-EASM/EAWM • Improve Understanding of Monsoon Dynamics

  3. Picture of the Problem WARM COLD -10% -10% -16% -26% -34% 0% -4% -12% Evaporation -20% North Pole Cumulus Parameterization Large-scale condensation With cloud microphysics 0% SMOW EQ

  4. Benefits from Using Isotope-enable Model？ • Model-Data Comparison？气候态偏差；格点-站点的代表性；统计降尺度； • Reanalysis d18O？用准确的Reanalysis做Nudging • Proxy Assimilation？利用Isotope模式结果，寻找更准确的Transfer functions；再利用此关系，同化Proxy以进行更好的古气候模拟

  5. (Sturm, 2010)

  6. Annual Mean d18O in Water Vapor & Precip. CAM CAM GNIP (Lee, et al., 2007)

  7. Experiment Design 50-yr Integration with Fixed BC 10-yr Spin-up 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 (ka) 22 • Model: CAM3 with Isotope-enable module • Each slice was integrated for 50 years, with first 10-year truncated as spin-up • Outputs: Atm/Monthly; Winds/Daily; Water Isotope/Monthly • Water Isotopes: • d18O in precipitation and in water vapor • deuterium (dD) in precipitation and in water vapor

  8. Forcing: • GHGs (CO2; CH4; N2O) • Orbital Parameters • Terrain/Sea Level • SST/SICE • Water Isotopes at Sea Surface • Terrain, Sea Level, SST/SICE are derived from Drs Liu and Feng’sTraCE simulations, which is a fully-coupled transient simulation for the period 22ka-Present. JJA DJF

  9. ANN DJF JJA

  10. d18O in Precip. JJA Hulu Cave (Wang, 2001) Dongge Cave (Wang, 2005)

  11. d18O in Precip. DJF ? Hulu Cave (Wang, 2001) Dongge Cave (Wang, 2005)

  12. Temperature Effect vs. Amount Effect

  13. Temperature EffectCorr( d18O, Ts ) ANN ANN DJF DJF JJA JJA Inter-Millennium 较松的标准 Inter-Annual 较严的标准

  14. Amount EffectCorr( d18O, Precip ) ANN ANN DJF DJF JJA JJA Inter-Millennium 较松的标准 Inter-Annual 较严的标准

  15. 温度效应vs数量效应 Corr( d18O, Ts ) Corr( d18O, Precip ) ANN ANN DJF DJF JJA JJA

  16. Local vs. Regional

  17. d18O的空间代表性如何？ ANN ANN DJF DJF Corr( d18O, d18O ) JJA JJA Inter-Millennium 较松的标准 Inter-Annual 较严的标准 (Pausata, Battisti, et al, 2011)

  18. Precip (Local)vs. d18O (Regional) ANN ANN DJF DJF Corr( Precip, d18O ) JJA JJA Inter-Millennium 较松的标准 Inter-Annual 较严的标准

  19. Summary Hints from CAMiso: • d18O来源于Indian Ocean • JJA d18O与OBS中很相似 • d18O和Temp是大尺度；Precip是小尺度 • d18O与Temp关系更好；而与Precip关系小

  20. Fig 1. Time series

  21. Fig 1 (Supplement Material)JJA Time Series @ each point V1000 V850 SAT Prec.

  22. Fig 1 (Supplement Material)DJF Time Series @ each point V1000 V850 SAT Prec.

  23. Fig 1 (Supplement Material)ANN Time Series @ each point V1000 V850 SAT Prec.

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