Dendrohydrology: The Use of Tree Ring Data in Paleo ...
Transcript of Dendrohydrology: The Use of Tree Ring Data in Paleo ...
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Lake Mead above Hoover Dam – early 2000’s
Lake Lanier – late 2000’s
Dendrohydrology: The Use of Tree Ring
Data in Paleo Reconstructions
Glenn Tootle1 and Matt Therrell2 1University of Alabama, Department of Civil, Const. and Env. Engineering
2University of Alabama, Department of Geography
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Outline
• Western US Water & Colorado River Compact
• Paleohydrology
– Past Research in the Upper Colorado River Basin
• Developing a Tree Ring Chronology (TRC)
• Developing a Streamflow Reconstruction
• Reconstruction Potential in the SE US
• Questions
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Mark Twain’s View
"Whiskey is for drinking; water is
for fighting over“
"Water, taken in moderation,
cannot hurt anybody"
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Allocation of Colorado River Water
[16.5 million acre-ft (MAF)]
Water Education Foundation, 1999
Lee Ferry
Upper Basin
(7.5 MAF)
WY – 1.0 MAF
CO – 3.9 MAF
NM – 1.7 MAF
UT – 0.9 MAF
Lower Basin
(7.5 MAF)
NV – 0.3 MAF
CA– 4.4 MAF
AZ – 2.8 MAF
Mexico – 1.5 MAF
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Stockton and Jacoby (1976)
First statistical recon-
struction of streamflow
from tree rings
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National Science Foundation Paleo Perspectives on Climate Change (P2C2) (AGS-1003393)
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Tree ring records have been cross-dated to provide to date
historic events
Image courtesy of LTRR (U. AZ)
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Source: Barnett, 2007
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Site Selection (Moisture Sensitive Species, Old, Stressed)
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Site Selection (Wind River Range, Wyoming)
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Site Selection (near Grants, New Mexico)
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Tree core sampling
and core preservation
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Tree Ring Lab
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Many samples from a site are detrended and combined to create a
single time series (chronology)
Rin
g w
idth
ind
ex
Image courtesy of J. Lukas (U. CO)
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Statistical models (reconstructions) of streamflow, snowpack,
precipitation, soil moisture can be developed going back in time
300 to 500 years identifying extreme events.
Mega Drought Extreme Wet
Source: Barnett et al., 2010
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Water-Year (1936 to 2013)
Rank 1-year 5-year (end year) 10-year (end year)
1 2012 1989 2008
2 2000 2004 2009
3 2011 2003 1989
4 2002 1988 1959
5 1955 2008 2007
6 2007 1959 2013
7 1981 2002 2012
8 1951 1955 2011
9 1956 1956 1960
10 2006 2006 1988
Choctawhatchee River
Water-Year
Droughts
New
ton A
L
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Choctawhatchee River Water-Year Streamflow
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Choctawhatchee River Reconstruction Potential
Months of April, May and June streamflow are highly correlated
with Bald Cypress Tree Ring Chronologies (TRC)
3-month seasons of FMA, MAM, AMJ and MJJ streamflow are highly correlated
with Bald Cypress Tree Ring Chronologies (TRC)
6-month seasons of FMAMJJ, MAMJJA and AMJJAS streamflow are highly correlated
with Bald Cypress Tree Ring Chronologies (TRC)
TRC1 ends in 1992 TRC2 ends in 1987
Newton Water-Year: TRC1 (0.49) / TRC2 (0.65) Bruce Water-Year: TRC1 (0.54) / TRC2 (0.61)
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http://choctawhatcheerivertreeringstudy.weebly.com/