xinyu wen & zhengyu liu dept of atmospheric and oceanic sciences, peking university

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Isotope Simulation of the Evolution of East Asian Monsoon since the LGM: A Preliminary Analysis LGM 对对对对对对对对对对对对对对 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

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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 - PowerPoint PPT Presentation

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Page 1: 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 LiuDept of Atmospheric and Oceanic Sciences, Peking University

Contributors: Esther Brady & Otto-Bliesner BetteCCR/CGD, NCAR

Jun/29/2012 @ Nanjing

Page 2: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Overview1. Model-Data Comparison2. Interpretation of d18O3. Appropriate Indices for

Paleo-EASM/EAWM4. Improve Understanding of Monsoon

Dynamics

Page 3: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

EQNorthPole

0%

-10% -10%-16%

-26%-34%

0% -4% -12%-20%

WARM COLD

SMOW

Picture of the Problem

CumulusParameterization

Large-scale condensationWith cloud microphysics

Evap

orat

ion

Page 4: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

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

Page 5: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

(Sturm, 2010)

Page 6: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Annual Mean d18O in Water Vapor & Precip.

CAM

GNIP

CAM

(Lee, et al., 2007)

Page 7: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 (ka)

50-y

r In

tegr

atio

n w

ith F

ixed

BC

10-y

r Sp

in-

up

Experiment Design

• 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

Page 8: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

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’s TraCE simulations, which is a fully-coupled transient simulation for the period 22ka-Present.

22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 00.9998 1.0000 1.0002 1.0004 1.0006 1.0008 1.0010 1.0012 1.0014 1.0016 1.0018

Age (ka)

H21

8O (

per

mil)

DJF

JJA

Page 9: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

ANNDJF JJA

Page 10: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Hulu Cave (Wang, 2001)Dongge Cave (Wang, 2005)

d18O in Precip.JJA

Page 11: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

d18O in Precip.DJF

?Hulu Cave (Wang, 2001)

Dongge Cave (Wang, 2005)

Page 12: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Temperature Effect vs. Amount Effect

Page 13: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Temperature EffectCorr( d18O, Ts )

Inter-Millennium较松的标准 Inter-Annual较严的标准

ANN ANN

DJF DJF

JJA JJA

Page 14: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Amount EffectCorr( d18O, Precip )

Inter-Millennium较松的标准 Inter-Annual较严的标准

ANN ANN

DJF DJF

JJA JJA

Page 15: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

ANN

DJF

JJA

ANN

DJF

JJA

温度效应 vs 数量效应Corr( d18O, Ts ) Corr( d18O, Precip )

Page 16: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Local vs. Regional

Page 17: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

ANN

DJF

JJA

ANN

DJF

JJA

Corr( d18O, d18O )

Inter-Millennium较松的标准 Inter-Annual较严的标准

d18O的空间代表性如何?

(Pausata, Battisti, et al, 2011)

Page 18: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

ANN

DJF

JJA

ANN

DJF

JJA

Corr( Precip, d18O )

Inter-Millennium较松的标准 Inter-Annual较严的标准

Precip (Local) vs. d18O (Regional)

Page 19: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

SummaryHints 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

Page 20: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Fig 1. Time series

Page 21: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Fig 1 (Supplement Material)JJA Time Series @ each point

V1000 V850 SAT Prec.

Page 22: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Fig 1 (Supplement Material)DJF Time Series @ each point

V1000 V850 SAT Prec.

Page 23: Xinyu  Wen & Zhengyu  Liu Dept of Atmospheric and Oceanic Sciences, Peking University

Fig 1 (Supplement Material)ANN Time Series @ each point

V1000 V850 SAT Prec.