xinyu wen & zhengyu liu dept of atmospheric and oceanic sciences, peking university
DESCRIPTION
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 PresentationTRANSCRIPT
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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 LiuDept of Atmospheric and Oceanic Sciences, Peking University
Contributors: Esther Brady & Otto-Bliesner BetteCCR/CGD, NCAR
Jun/29/2012 @ Nanjing
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Overview1. Model-Data Comparison2. Interpretation of d18O3. Appropriate Indices for
Paleo-EASM/EAWM4. Improve Understanding of Monsoon
Dynamics
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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
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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
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(Sturm, 2010)
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Annual Mean d18O in Water Vapor & Precip.
CAM
GNIP
CAM
(Lee, et al., 2007)
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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
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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
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ANNDJF JJA
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Hulu Cave (Wang, 2001)Dongge Cave (Wang, 2005)
d18O in Precip.JJA
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d18O in Precip.DJF
?Hulu Cave (Wang, 2001)
Dongge Cave (Wang, 2005)
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Temperature Effect vs. Amount Effect
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Temperature EffectCorr( d18O, Ts )
Inter-Millennium较松的标准 Inter-Annual较严的标准
ANN ANN
DJF DJF
JJA JJA
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Amount EffectCorr( d18O, Precip )
Inter-Millennium较松的标准 Inter-Annual较严的标准
ANN ANN
DJF DJF
JJA JJA
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ANN
DJF
JJA
ANN
DJF
JJA
温度效应 vs 数量效应Corr( d18O, Ts ) Corr( d18O, Precip )
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Local vs. Regional
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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)
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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)
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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
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Fig 1. Time series
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Fig 1 (Supplement Material)JJA Time Series @ each point
V1000 V850 SAT Prec.
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Fig 1 (Supplement Material)DJF Time Series @ each point
V1000 V850 SAT Prec.
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Fig 1 (Supplement Material)ANN Time Series @ each point
V1000 V850 SAT Prec.