Paleoclimate modeling of Eocene and Miocene using different … · 2012-02-23 · Motivation •...
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Paleoclimate modeling of Eocene and Miocene using different
boundary conditions and resolutions in CESM1.0
A a r o n G o l d n e r , M a t t h e w H u b e r , N i c h o l a s H e r o l d
P u r d u e U n i v e r s i t y , W e s t L a f a y e t t e I n d i a n aU n i v e r s i t é c a t h o l i q u e d e L o u v a i n , B r u s s e l s B e l g i u m
This work is supported by NSF P2C2 grants ATM- 0902882 and ATM-0902780, and a GAANN Fellowship which supports the graduate student
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Motivation• Quantifying the temperature
sensitivity between the CO2 and non-CO2 forcings important for Cenozoic climate intervals like the middle Eocene (~45 mya), Eocene/Oligocene Transition (~35 mya), and middle Miocene (~15 mya).
Zachos et al., 2001
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Motivation• Quantifying the temperature
sensitivity between the CO2 and non-CO2 forcings important for Cenozoic climate intervals like the middle Eocene (~45 mya), Eocene/Oligocene Transition (~35 mya), and middle Miocene (~15 mya).
Zachos et al., 2001
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Motivation• Quantifying the temperature
sensitivity between the CO2 and non-CO2 forcings important for Cenozoic climate intervals like the middle Eocene (~45 mya), Eocene/Oligocene Transition (~35 mya), and middle Miocene (~15 mya).
Zachos et al., 2001
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Motivation• Quantifying the temperature
sensitivity between the CO2 and non-CO2 forcings important for Cenozoic climate intervals like the middle Eocene (~45 mya), Eocene/Oligocene Transition (~35 mya), and middle Miocene (~15 mya).
Zachos et al., 2001
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NCAR CESM1.0.3• We use the newest model released from the National
Center for Atmospheric Research (NCAR), the Community Earth System Model (CESM1.0.3) (http://www.cesm.ucar.edu/models/cesm1.0/).
• We conduct a series of fully coupled and slab ocean simulations for the Eocene at varying resolutions.
• We conduct a series of slab simulations for the Miocene at 1.9x2.5 degree resolution.
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Completed Eocene Modeling Simulations
Compset Resolution CO2 Equilibrated? Boundary Change
B (CAM4) T31 560,1120,2240 >1700 years Antarctic ice sheet
E (CAM4) T31 560,1120,2240,4480 yes Antarctic ice sheet
E (CAM4) T85 1120 yes Antarctic ice sheet
E (CAM4) 1.9x.25 560,1120,2240 yes Antarctic ice sheet, aerosols, methane
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Eocene Coupled Model Comparison: CO2
CESM1.0.3 versus CCSM3
2240 ppm - 1120 ppm CO2
2240 ppm CO2
1120 ppm CO2
CESM1.0.3 Sensitivity
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Eocene Coupled Model Comparison: CO2
CESM1.0.3 versus CCSM3
2240 ppm - 1120 ppm CO2
2240 ppm CO2
1120 ppm CO2
CESM1.0.3 Sensitivity
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Eocene Coupled Model Comparison: CO2
CESM1.0.3 versus CCSM3
2240 ppm - 1120 ppm CO2
2240 ppm CO2
1120 ppm CO2
CESM1.0.3 Sensitivity
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Eocene Coupled Model Comparison: CO2
CESM1.0.3 versus CCSM3
2240 ppm - 1120 ppm CO2
2240 ppm CO2
1120 ppm CO2
CESM1.0.3 Sensitivity
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Eocene: Antarctic Glaciation• Place a modern size Antarctic ice sheet
(topography, SGH30,SGH, and albedo) into Eocene control simulations. Below are Anomalies.
E_T31 1120 E_T85 1120
B_T31 1120E_2x2 1120
-
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Eocene: Antarctic Glaciation• Place a modern size Antarctic ice sheet
(topography, SGH30,SGH, and albedo) into Eocene control simulations. Below are Anomalies.
E_T31 1120 E_T85 1120
B_T31 1120E_2x2 1120
-
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Eocene: Antarctic Glaciation• Place a modern size Antarctic ice sheet
(topography, SGH30,SGH, and albedo) into Eocene control simulations. Below are Anomalies.
E_T31 1120 E_T85 1120
B_T31 1120E_2x2 1120
-
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Eocene: Antarctic Glaciation• Place a modern size Antarctic ice sheet
(topography, SGH30,SGH, and albedo) into Eocene control simulations. Below are Anomalies.
E_T31 1120 E_T85 1120
B_T31 1120E_2x2 1120
-
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Eocene: Antarctic Glaciation• Place a modern size Antarctic ice sheet
(topography, SGH30,SGH, and albedo) into Eocene control simulations. Below are Anomalies.
E_T31 1120 E_T85 1120
B_T31 1120E_2x2 1120
-
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Eocene Slab Model: Antarctic Glaciation -
-0.19 1.26
Figure 4. (a) Annually averaged surface temperature anomalies (K) and annually averaged total cloud forcing (longwave cloud forcing (LWCF)+shortwave cloud forcing (SWCF)) in W/m2 (b), (c) normalized ga (greenhouse effect without clouds) anomaly in % .
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Shortwave Cloud Forcing Anomalies Cloud fraction anomalies and
uplift/subsidence regions around Antarctica
Eocene Slab Model: Antarctic Glaciation
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Radiative Impact
Eocene
future
Eocene
future
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Results Eocene CAM4/CAM5• Coupled model shows roughly a ~3K per
doubling of CO2 warming.
• Slab model using CAM4 has a 3.5K per doubling of CO2 warming.
• Adding Antarctic glacier into Eocene induces a global cooling signal from (-0.19 to -1.8 K).
• Prescribed aerosols using bulk aerosol mode (BAM) approach warm the Eocene ~0.3K.
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Miocene Sensitivity: Topography
“greenhouse” topography
original topography low topography
original topography
original topo minus low topo
original topo minus greenhouse topo
“Miocene greenhouse topography”-Pollard and DeConto, 2009
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Miocene Sensitivity
BAM prescribed Aerosols versus PI prescribed aerosols. Used workflow developed by Christine Shields
Miocene 560 “original-higher topography” minus “lower” topography and less glacier in Antarctica
Aerosols Less Antarctic Glacier
2x pre-industrial CH4
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Special Thanks• Matthew Huber
• Gabe Bowen
• Alex Gluhovsky
• Dorian Abbot
• Christine Shields
• David Bailey
• Nicholas Herold
• Rodrigo Caballero
• Jonathan Buzan
• Nan Rosenbloom
• NSF grants ATM- 0902882 and ATM-0902780
• Purdue Climate Change Research Center
• NCAR paleoclimate working group
• Purdue University, Earth and Atmospheric Sciences
• Amanda Frigola
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References• Herold, N., M. Huber, R. D. Müller, Modeling the Miocene Climatic Optimum. Part I: Land and
Atmosphere*. J. Climate, 24, 6353–6372, 2011.
• Huber, M. and Caballero, R.: The early Eocene equable climate problem revisited, Clim. Past, 7, 603-633, doi:10.5194/cp-7-603-2011, 2011.
• Liu, Z., Pagani, M., Zinniker, D., DeConto, R., Huber, M., Brinkhuis, H., Shah, S., Leckie, M.,and Pearson, A., Global cooling during the Eocene-Oligocene climate transition,Science, 323, 1187-1190, doi: 10.1126/science.1166368, 2009.
• Pollard, D. & R. M. DeConto, Modelling West Antarctic ice sheetgrowth and collapse through the past five million years. Nature 458, 329-332, 2009.
• Zachos, J. C., Pagani, M., Sloan, L., Thomas, E. & Billups, K. Trends, rhythms, and aberrations in global climate 65 Ma to present. Science 292, 686–693, 2001.
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