Determining the Vulnerability and Resilience of Boreal Forests & Shrubs across Northwestern North America R. D’Arrigo 1 L. Andreu-Hayles 1 S. Goetz 3 R. Oelkers 1 R. Wilson 1,2 G. Wiles 1,4 N. Davi 1,5 1. Lamont-Doherty Earth Observatory, Palisades, NY [email protected] 2. University of St. Andrews, UK 3. Northern Arizona University, AZ 4. The College of Wooster, Ohio 5. William Paterson University, NJ NASA ABOVE Science Meeting, Boulder Colorado, January 19-20, 2017
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Determining the Vulnerability and Resilience of Boreal Forests & Shrubs across Northwestern North America
R. D’Arrigo1
L. Andreu-Hayles1
S. Goetz3
R. Oelkers1
R. Wilson1,2
G. Wiles1,4
N. Davi1,5
1. Lamont-Doherty Earth Observatory, Palisades, NY [email protected]. University of St. Andrews, UK
3. Northern Arizona University, AZ4. The College of Wooster, Ohio
5. William Paterson University, NJ
NASA ABOVE Science Meeting, Boulder Colorado, January 19-20, 2017
PROJECT GOALS
1. UPDATE TREE-RING FIELD COLLECTIONS OF TREE/SHRUB WOOD AT NORTHERN ALASKAN TREELINE FOR RECENT DECADES.
2. GENERATE TREE-RING CHRONOLOGIES OF RING WIDTH AND DENSITY.
3. COMPARE TREE-RING AND SATELLITE INDICES TO ASSESS RECENT EXTREMES & TRENDS IN BOREAL FOREST GROWTH RATES (IN NW NORTH AMERICA)
The overarching theory being tested in this project is that the current controls over vegetation growth are not operating as they have been in the past.
BUILDS UPON & EXTENDS PREVIOUS WORK IN THE REGION
TRE
E R
ING
WID
TH T
RE
ND
GIMMS3g NDVI TREND
1982-2008
Beck et al. 2013 GPC
TREE-RING SAMPLES SITES NORTHWESTERN NORTH AMERICA
We will target sites that have not been updated in the past decade or more
1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010-3
-1.5
0
1.5
3
Daws
on Ju
ly-Aug
ust Te
mpera
ture
Time (years)
(b) 1897-2001 r = 0.454 p < 0.0011900-1950 r = 0.424 p = 0.0019 1951-2001 r = 0.491 p < 0.001
1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 20100.8
0.9
1
1.1
1.2
Resid
ual NE
XP MX
D
1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010-3
-1.5
0
1.5
3
Daws
on Su
mmer
Temper
ature
Time (years)
(a) 1897-2001 r = 0.300 p = 0.0021900-1950 r = 0.516 p < 0.001 1951-2001 r = 0.079 p = 0.581
1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 20100
0.5
1
1.5
2
Resid
ual NE
XP TR
W
Top: Ringwidth and air temperatures (Dawson, Yukon) show recent loss of correlation.
Bottom: More consistent correlation of ring Late Wood Density (MXD) and airtemperature (Andreu-Hayles et al. 2011).
Changing climate sensitivity at Firth River, Alaska.
Top: GIMMS3g NDVIBottom: May-June growing season temperatures
Beck et al. 2013 GPC
Correlations of tree-ring density & NDVI (1982-2004) at 4 sites (stars) within the ABoVE domain
ADDITIONAL TREE-RING DATA FROM LUCKMAN COLLECTION
Contains material with at least eight, 800-1100 year chronologies from three species (Engelmann spruce, Whitebark pine and Alpine larch) from sites in the Yukon, southern British Columbia, and Alberta.
There are also extensive core collections - some never measured - that will be used to develop regional temperature records for the past 3-400 years using MXD and BI, which will be compared to satellite data.
SUMMARYRecently funded NSF Arctic project affiliated with NASA ABOVE.
This project will update and improve coverage for a tree-ring network (ring width, maximum latewood density, blue light intensity).
This network will be compared to NDVI and other indices (climate) to assess and cross-validate recent growth trends and extremes in the far North and increase
understanding of recent patterns (greening, browning) across NW North America.
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