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![Page 1: Simulating the impacts of Large Scale Insect- and Disease- Driven Tree Mortality on atmospheric chemistry Colette Heald, Sam Silva Department of Civil.](https://reader034.fdocuments.us/reader034/viewer/2022042707/5a4d1b687f8b9ab0599b1eae/html5/thumbnails/1.jpg)
Simulating the impacts of
Large Scale Insect- and Disease- Driven Tree Mortality
on atmospheric chemistry
Colette Heald, Sam SilvaDepartment of Civil &
Environmental EngineeringMassachusetts Institute of Technology
Jeffrey Geddes, Randall MartinDepartment of Physics & Atmospheric Science
Dalhousie University, Canada
AGU Fall Meeting 2015 Abstract A41R-07 [email protected]
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Human-Driven Land Use and Land Cover Change
Ramenkutty et al. (2008)
Global Croplands
Global Pastures
Croplands
Grasslands
Forests
Area
(106
km
2 )
Lawrence et al. (2012)
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http://www.fws.gov/news/blog/index.cfm/2011/5/18/
“Natural” Land Cover Change
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http://www.fws.gov/news/blog/index.cfm/2011/5/18/
“Beetle-Battle”http://www.climate.org/
“Unprecedented Assault”http://www.ucsusa.org/
“Perfect Storm” http://www.fws.gov/
“Zombie Trees” http://www.king5.com/
“The West’s Hurricane Katrina”
http://e360.yale.edu/
“Natural” Land Cover Change
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Land System Impacts on Atmospheric Chemistry ??
DEPOSITION
BVOC NOx
Terrestrial Ecosystems
NOxOH OH CH4
BVOC
O3, SOA O3, PAN, HNO3 …
Biosphere acts as both a
source and sink of
important reactive chemical species
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Land-Atmosphere Exchange in a Chemical Transport Model
Geddes et al. (2015) Atmos. Chem. Phys. Discuss.
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Projected Insect- and Disease-driven Tree Mortality (2013 – 2027)
http://www.fs.fed.us/foresthealth/technology/nidrm.shtml
2013 National Insect and Disease Risk Map
GEOS-Chem Land Input File
Base Simulation
Tree Mortality Simulation
Impacts on atmospheric chemistry?
Jun-Jul-Aug
Geddes et al. (2015) Atmos. Chem. Phys. Discuss.
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Predicted Tree Loss Exceeds 20% in Many RegionsNeedleleaf Trees
Broadleaf Trees
Pine, spruce, fir beetles; Spruce budworm
Beech bark disease; Dutch elm disease; Oak wilt
Tree Cover Fraction Tree Cover
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Country-wide BVOC Emissions Decrease ~5%; Locally up to 50%Iso
pren
eTo
tal
Mon
oter
pene
s
Tota
l Se
squi
terp
enes Δ
Emiss
ions
(μm
ol m
-2
hr-1)
Emiss
ions
(μm
ol m
-2
hr-1)
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Slower Deposition Velocity (~10%) over Affected Regions
DRY DEPO
SITION
𝐹 𝑖=𝑣 𝑑×[𝐶 ]
Ozone Deposition Velocity
Lower vegetation density decreases grid-average deposition velocity (vd)
Important for species whose depositional losses are competitive
with chemistry
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Spatial Variability in O3 Impacts Depend on Chemistry/Deposition
O 3 (p
pb)
Base Simulation
Changing Emissions
Only
Changing Emissions
& Depositio
n
O3 (
ppb)
Decrease in concentrations (~0.6
ppb) due to lower BVOC emissions
Net increase in concentrations (~1.2 ppb) due to slower
deposition velocities
Largelycounteracted by…
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Spatial Variability in O3 Impacts Depend on Chemistry/Deposition
Base Simulation
Changing Emissions
& Depositio
n
Mitigates high O3 in polluted regions
Exacerbates high O3 in clean regions
Changing Emissions
Only
O 3 (p
pb)
O3 (
ppb)
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Organic Aerosol Decreased by ~10%; Locally up to ~25%
Biogenic-derived Secondary Organic Aerosol (ug/m3)
Relative Impact to Total Organic Aerosol
Highest impacts (~25%) in terpene-dominated regions
Total OA decreases by 5-10% across large areas of
south, eastern, and northwestern U.S.
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Conclusions & Future Considerations
Large local impacts on atmospheric chemistry due to projected tree mortality
Temporal dimension of insect attack and post-
disturbance succession?
Insect - Fire - Climate Interactions?
Geddes JA, Heald CL, Silva SJ and Martin RV (2015) Land cover change impacts on atmospheric chemistry: Simulating projected large-scale tree mortality in the US,
Atmos. Chem. Phys. Discuss., 15, 29303-29345.
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Conclusions & Future Considerations
Large local impacts on atmospheric chemistry due to projected tree mortality
Must consider land cover change in regional chemistry and climate predictions
Temporal dimension of insect attack and post-
disturbance succession?
Insect - Fire - Climate Interactions?
Current and future oil palm expansion:
Sam SilvaA43G-0392 13:40
O3 (ppb)
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Acknowledgements
…and Thanks for your attention
A41R: Tropospheric Chemistry-Climate-Biosphere InteractionsConveners, Chairs, and PresentersFunding:Natural Sciences and Engineering Research Council of Canadaand the NSERC CREATE IACPES ProgramNational Science Foundation (AFC-1238109)