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
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
Overview1. Model-Data Comparison2. Interpretation of d18O3. Appropriate Indices for
Paleo-EASM/EAWM4. Improve Understanding of Monsoon
Dynamics
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
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
(Sturm, 2010)
Annual Mean d18O in Water Vapor & Precip.
CAM
GNIP
CAM
(Lee, et al., 2007)
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
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
ANNDJF JJA
Hulu Cave (Wang, 2001)Dongge Cave (Wang, 2005)
d18O in Precip.JJA
d18O in Precip.DJF
?Hulu Cave (Wang, 2001)
Dongge Cave (Wang, 2005)
Temperature Effect vs. Amount Effect
Temperature EffectCorr( d18O, Ts )
Inter-Millennium较松的标准 Inter-Annual较严的标准
ANN ANN
DJF DJF
JJA JJA
Amount EffectCorr( d18O, Precip )
Inter-Millennium较松的标准 Inter-Annual较严的标准
ANN ANN
DJF DJF
JJA JJA
ANN
DJF
JJA
ANN
DJF
JJA
温度效应 vs 数量效应Corr( d18O, Ts ) Corr( d18O, Precip )
Local vs. Regional
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)
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)
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
Fig 1. Time series
Fig 1 (Supplement Material)JJA Time Series @ each point
V1000 V850 SAT Prec.
Fig 1 (Supplement Material)DJF Time Series @ each point
V1000 V850 SAT Prec.
Fig 1 (Supplement Material)ANN Time Series @ each point
V1000 V850 SAT Prec.