Integrating Spaceborne Observations of Greenhouse Gases and...
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Integrating Spaceborne Observations of Greenhouse Gases and Forest Structure to Estimate Land-Cover and Land-Use Change Emissions Ben Poulter 1 , Leo Calle 2 , Philippe Ciais 3 , George Hurtt 4 , Masa Kondo 5 , Lesley Ott 1 , and Prabir Patra 6 1 NASA, 2 Montana State University, 3 LSCE, 4 University of Maryland, 5 Chiba University, 6 JAMSTEC
Transcript of Integrating Spaceborne Observations of Greenhouse Gases and...
Integrating Spaceborne Observations of Greenhouse Gases and Forest Structure to Estimate Land-Cover and Land-Use Change EmissionsBen Poulter1, Leo Calle2, Philippe Ciais3, George Hurtt4, Masa Kondo5, Lesley Ott1, and Prabir Patra6
1NASA, 2Montana State University, 3LSCE, 4University of Maryland, 5Chiba University, 6JAMSTEC
Acknowledgements
• Activities funded by:• NASA Carbon Monitoring System (CMS)• NASA Arctic-Boreal Vulnerability Experiment (ABoVE)• NASA Interdisciplinary Sciences (IDS)
• Data contributions from OCO-2, TRENDY Model Intercomparison, NASA GMAO
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Can we detect LULCC emissions from space?
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Land-cover change (Song et al. 2018)
Burned area (Andelaet al. 2017)
XCO2
ESM
What is the role of LULCC in the Earth system?
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Accounting for LULCC emissions?
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Net LULUCC = (Wood harvest + Deforestation Fires + Soil Erosion + Committed Emissions [products, slash] + Legacy Emissions + Crop Harvest + Pasture Management) - Regrowth
Can GHG satellites be integrated with forest structure missions?• GHG satellites track column concentrations
• How to disaggregate flux to source/sink sectors?
• Types of LULCC emissions would impose ‘instantaneous’ signature• Deforestation fires• Deforestation (loss of C uptake, slow release)• Crop harvest (rapid switch in carbon cycle)• Crop burning
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Urba
n OC
O-2
XCO 2
anom
aly
Wild
fire
OCO-
2 XC
O 2an
omal
y
LULCC
Integrated RS LUCC system
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XCO2 Enhancement Land
Cover ChangeLand
Use
Deforestation Fires
Wood Harvest
Grass Management
Integrated RS LUCC system
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• LULCC hotspots are not monitored for CO2
Integrated RS LUCC system
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• Addressing scale and disaggregation of GHG signal
Sensitivity of XCO2 to Land Cover Change
• Simulation of LULCC processes• LPJml -> WH, shifting cultivation, GH, CH, legacy
emissions, wildfire• Land Use Harmonization version 2 (1700 to
2017)• Atmospheric transport using GEOS5 and
also with ACTM• MERRA2 and JRA55 Reanalysis wind fields used• 2 x 3.75 degree resolution
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Sensitivity of XCO2 to Land Cover Change
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Woo
d Ha
rves
t
Fore
st Lo
ss
1992
2017
1992
2017
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Sensitivity of XCO2 to Land Cover Change
Enhancement of XCO2, ppm, (difference of S3 – S2)• Seasonal effect due to legacy emissions?
Sensitivity of XCO2 to Land Cover Change
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Diff
eren
ce (K
gCm
-2)
19922017
Net land use change emissions simulated by LPJ
Summary• Can we combine forest structure and GHG remote sensing for LULCC
applications?• LULCC XCO2 enhancement observed in simulation environment, e.g., OSSE• Distinguish between types of LULCC fluxes (instantaneous vs committed)• Address scaling challenges of datasets, observational period, and extent• Work toward a methodology for statistical disaggregation of XCO2
enhancement constrained by land cover, biomass, land use remote sensing with an atmospheric model (beyond atmospheric inversion)
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