course air-sea interaction paleoclimatology introductory material online introduction:
TRANSCRIPT
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Course Air-Sea Interaction
Paleoclimatology Introductory material
Online introduction:
http://www.ncdc.noaa.gov/paleo/primer.html
Textbooks:
Bradley, R.S., 1999. "Paleoclimatology: Reconstructing
Climates of the Quaternary". Academic Press, San
Diego.
Saltzmann, B. :Dynamical Paleoclimatology: Generalized
Theory of Global Climate Change
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Suggested Reading
Cobb et al., El Niño/Southern Oscillation and tropical
Pacific climate during the last millennium, Nature,
424(6946), 271-276, 2003
Jones, P.D., Osborn, T.J, Briffa, K.R. The Evolution of
Climate Over the Last Millennium, Science, 292(5517),
pp. 662-667, 2001
Jones, P.D., Mann, M.E., Climate Over Past Millennia,
Rev. Geophysics, 42(2),RG2002, 2004
(doi:10.1029/2003RG000143)
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Introductory:
Earth Geologic time scale
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Geologic time scale
Taxonomy (Classification)
Eon
Era
Period
Epoch
Age
(Chronozone)
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Geologic time scale
Taxonomy (Classification): Where are we now?
Eon: Phanerozoic
Era: Cenozoic (“new life” after dinosaurs' extinction)
Period: Quaternary (glacial-interglacial cycles)
Epoch: Holocene (some call the time since the industrial
revolution Anthropocene) Age: (Climate Change age?!?)
(previous age: “Little Ice Age”, “Medieval Warm Period”)
We will look at the last 1000 years of the Holocene and the last 100,000-1,000,000
years of Quaternary Period.
http://www.stratigraphy.org
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Sources of climatic information:
climate proxies
Any indirect information about the past climate!
Tree ring width reflects climate of the growth season
Isotopes and trace metals from coral skeletons, speleothems
Ice cores: isotopes, trace metals, annual layer thickness
Marine sediment cores: foraminifera assemblages, isotopes,
trace metals, grain size, pollen
(Historical records: weather descriptions, harvest reports,
famines etc.)
What are climate proxies?
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Sources of climatic information:
climate proxies
Any indirect information about the past climate!
Tree ring width reflects climate of the growth season
Isotopes and trace metals from coral skeletons, speleothems
Ice cores: isotopes, trace metals, annual layer thickness
Marine sediment cores: foraminifera assemblages, isotopes,
trace metals, grain size, pollen
(Historical records: weather descriptions, harvest reports,
famines etc.)
What are climate proxies?
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Definition: natural climate proxy
(“proxy”)
A physical or chemical property of a given
medium that is influenced by one or more
components of the climate system.
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Climate of the last millennium Goals in Paleoclimatology:
develop continuous records of climate variability
(with annual resolution)
Scientific value:
understanding of natural climate variability
in particular decadal and multidecadal variability!
providing a basis for the detection of
anthropogenic climate change, model validation etc.
interdisciplinary studies (archeology, anthropology ...)
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Regions with high-resolution
paleoclimatic archives
From Jones (2001)
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General tasks in paleoclimatology
Development of accurate timescales
Dating methods rely on several methods
Clearly distinguished annual layers
Reference points such as historically documented
volcanic eruptions
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General tasks in paleoclimatology
Estimating the response function of proxies
[mechanistic linkage between climate and proxies]
Tree ring width: temperature and/or rainfall, seasonality,
biological growth factors.
Ice core oxygen isotopes: interpreted as local temperatures
but other factors such as climatic conditions over the oceanic
source regions (the water source of the snow)
Corals: biological growth factors, oxygen isotopes reflect
temperature and salinity signals (mixed signals)
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Statistical concepts in
paleoclimatology A set of proxies Y=(y
1,y
2,...y
m) is responding to climate
signals X=(x1,x
2,...x
n) in a systematic way given by its
response function f
Y = f(X)
We try to find a transfer function g that recovers the
climate state from the proxy state
X^=g(Y)
Usually we don't know the exact form of f and g and/or all
the relevant climate signals X !
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Linear response function
Y = HX + N
H is a (m * n) matrixN is a noise vector (m * 1) Multiple linear regression,(Principal Component
Regression)are used to estimate the climatestate from proxy data
X^ = (Ht H)-1 Ht Y (Best Linear Unbiased Estimator)
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Linear response function
Y = HX + N
H is a (m * n) matrixN is a noise vector (m * 1) Multiple linear regression,(Principal Component
Regression)are used to estimate the climatestate from proxy data
X^ = (Ht H)-1 Ht Y
– The uniformitarian principle is assumed
• Contemporary climatic variations from a modern analog
apply for paleoclimatic changes
• equivalent to stationarity of response function/ transfer
function
• equivalent to statistical stationarity
(covariance terms do not change)
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http://en.wikipedia.org/wiki/Hockey_stick_controvers
The climate of the last 1,000 years
Northern Hemisphere Temperature
The “Hockey Stick Curve”Overlapping
data interval:
estimating
response function
calibration of
transfer model
valildation
transfer model
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What controls the amplitude of ENSO
ENSO variancemaybe skewness
Noise leveldT/dt=f (T,u..)+Σ(T)ζ
Strength of annual cycle
dT/dt=f (T,u..)+Asinωt
Background statedT/dt=f (T,u,h,v,w)
NonlinearitiesdT/dt=f (u'T', Σ(T)ζ)
External factors
Coupling strength
(slide from A. Timmermann)
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ENSO: positive air-sea feedback
The Gill model:ut
fv x
ru
vt
fu y
rv
t
gHe(ux
vy
) Qa
Let f y , and write the nondimensional form:
yv / 2 x
u
yu / 2 y
v
ux
vy
Qa
The length scale is Rossby radius of deformation ( c / 2 ), timescale is 1 / 2c , velocity scale is c, geopotential scale is c2 .
Anomalous p
1982-12 1000mb 150oE 180oW 150oW 120oW 90oW
12oS
6oS
0o
6oN
12oN
1982-12 1000mb 150oE 180oW 150oW 120oW 90oW
12oS
6oS
0o
6oN
12oN
Rossby wave trains form global teleconnection pattern
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Atmospheric Teleconnection Pattern
Rossby Wave Trains
subtropical heating
source in the middle
troposphere
300 hPa geopotential height anomalies
(contour interval 2 dam)
Hoskins and Karoly, J. Atm. Sci., 38, 1179-1196,1981
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ENSO reconstructions
http://www.ncdc.noaa.gov/paleo/slides/slideset/13/13_226_bslide.html
Global teleconnection pattern --- regions with reconstruction potential
dryer
wetter
During
El Nino
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ENSO reconstruction with coral
proxies
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Proxy
abundance
Climate
Teleconnection
Working
Hypothesis
x
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Coral-based reconstruction of
ENSO
Source: Kim Cobb's paper (2003) and
presentation
at the Workshop on
Climatic Changes in the Last 1500
Years: Their Impact on Pacific Islands,
East West Center, Nov 2007
http://www.soest.hawaii.edu/~timm/files/workshop2007/
Workshop200711.html
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Coral proxies:
Isotopes and trace elements
Climatic state:
SST, SSS
proxies:
oxygen isotope18O/16O ratio, δ18O
Strontium/Calcuim ratio
(Sr/Ca)
Gagan, M.K. et al, Science, 279, 1998279
Cahyarini, S. Y. et al., Geochimica et Cosmochimica Acta, 72(12), 2841-2853
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Unmixing SST and SSS signals
from isotopes and trace elements
Gagan, M.K. et al, Science, 279, 1998279
Cahyarini, S. Y. et al., Geochimica et Cosmochimica Acta, 72(12), 2841-2853
SST SSS
δ18OSr/Ca
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SS
T A
nom
oly
(°C
)
3
2
1
0
-1
-2
18O
(‰
)
-0.6
-0.4
-0.2
0.0
0.2
NIÑO3.4 SSTPalmyra coral
Year (A.D.)
1900 1920 1940 1960 1980 2000
SS
T A
nom
oly
(°C
) 1
0
-1
-2
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
R = -0.66
R = -0.84
18O
(‰
)
Palmyra coral proxiesCalibration of the transfer model:
NINO3.4 index --- oxygen isotopes
oxygen isotopes:
MAINLY SST signal at Palmyra
δ18O
δ18O
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Strontium-Calcium ratios in corals:
Proxies for SST, exclusively
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ENSO reconstruction– The uniformitarian principle is assumed
• Contemporary climatic variations form a modern analog apply for
paleoclimatic changes
δ18O
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ENSO reconstruction
(Cobb et al. 2003)
LIA: high ENSO
variability
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ENSO index reconstruction
Multiproxy network
Gergis et al. (2006,2007)
Joelle Gergis presentation , 2007
http://www.soest.hawaii.edu/~timm/files/workshop2007/Workshop200711.ht
ml
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ENSO index reconstruction:
multiproxy network
Gergis et al. (2006,2007)
LIA
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Reconstruction of ENSO variance
year AD
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-4 -3 -2 -1 0 1 2 3 4sea surface tem perature anomaly (degrees C)
Sea Surface Temperature anomalies during 1987 El Niño
(SOURCE: IGOSS nmc ship, buoy & satellite data; http://ingrid.ldgo.columbia.edu/)
Pallcacocha
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year AD
Dynamical Interpretation of ENSO
reconstructions:Variance estimates
Reconstructions show
no conclusive evolution
of the variance, yet.
Pallcacocha lake
sediment core
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Other Modes of Variability
Indian Ocean Dipole
Abram N.J. et al, Nature Geoscience, Nov. 2008
Composite SST/ Rainfall over IOD
events 1994,1997, 2006.
Coral proxies capture the
warmer/wetter and cooler/dryer
conditions => reconstructed the
Dipole Mode Index.
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North Atlantic Oscillation
From Jones and Mann (2004)
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NAO reconstructions on
multidecadal time scale
Proxy (trees, ice cores)
locations
16-32yr variability
32-64yr variability
Timm, 2004 http://www.soest.hawaii.edu/~timm/files/disseration.pdf
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AMO reconstructions
Goldenberg et al., Science, 2001:
Relation Hurricanes - Atlantic SST
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AMO reconstructions
Gray et al.,GRL, 2004
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Oceanic Records of Multidecadal
VariabilityCariaco Basin: 800-yr high resolution sediment cores (Black et al, Paleoceanography, 2007)
No dominant decdal to multidecadal
variability in SST temperature
Correlation Mg/Ca with spring SST
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How are NAO and AMO connected
interannual timescales multidecdal timescales
composites of high-low NAO phases
SLP contours in hPa
SST shaded in K
SLP contours in hPa
SST shaded in K
[SST composite based on AMO index]
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How are ENSO-NAO-AMO-AMOC connected?(Timmermann et al, J. Clim., 20, 4899-4919, 2007,
Xie et al, J. Clim, 21, 3914-3928, 2008)
ocean-atmosphere
response to a substantial
weakening of the
Atlantic Meridional Overturning
Circulation
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Glacial-interglacial cycles In the 18th and early 19th century first evidence (and
acceptance as proof) for ice ages (rock formations in the Alpes, Agassiz, 1837)
Early (19th century) explanations for ice ages:
CO2-Effect Orbitally forcing Agassiz
(1807-1873)
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Antarctic ice core record from EPICA
cooler
Figure from http://www.realclimate.org/index.php?p=221
warmer
CO2 Greenhouse effect
weaker
stronger
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Precession 19,000+23,000 years Strong seasonal
effect
Eccentricity
100,000 years
Weak effect on annual insolation
Obliquity 41,000 years pole-equator contrast
in insolation seasonal changes
Precession depends on eccentricity
Images: http://earthobservatory.nasa.gov/Library/Giants/Milankovitch/
Milutin
Milankovitch
(1879-1958)
Milutin
Milankovitch
(1879-1958)
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Paleoclimate modelingTimmermann et al,
J. Climate, 20,
4147-4159, 2007.Annual cycle
ENSO
Zonal SST
gradient:
obliquity cycle
ACY and ENSO
amplitude:
precessional
cycle
ECHO-G model
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Paleoclimate modeling
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How can Precession Forcing
change the meridional SST gradient?
Importance of the seasonal cycle of cloud cover!
seaonal cycle of cloud cover meridional heating gradient
June Insolation
0-140,000 yrs ago
(10N red, 10S blue)
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Conceptual models for orbitally-
driven climate variability
Timmermann et al,
J. Climate, 20,
4147-4159, 2007.
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ENSO amplitude during the Last
Glacial Maximum
Atmosphere model: spectral model, T31, L18 Ocean model: primitive equations Resolution : ~0.9°x 3.6° Tropics otherwise 1.8x3.6°, L25 Sea-ice model: thermodynamic-dynamic Land model: Dynamic vegetation, Hydrology
Glacial greenhouse gas concentration Glacial land albedo Glacial topography Glacial land-sea distribution
CSM 1.4 climate model (Shin et al. 2003)
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ENSO variability
model years
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Course Air-Sea Interaction
Paleoclimatology References:
Online introduction:
http://www.ncdc.noaa.gov/paleo/primer.html
Textbooks:
Bradley, R.S., 1999. "Paleoclimatology: Reconstructing
Climates of the Quaternary". Academic Press, San
Diego.
Saltzmann, B. :Dynamical Paleoclimatology: Generalized
Theory of Global Climate Change