ramakrishna nemani, nasa arc richard waring, oregon state u. randy wynne, virginia tech weile wang,...
DESCRIPTION
Synergistic use of MODIS and Landsat data for mapping global forest carbon fluxes. Ramakrishna Nemani, NASA ARC Richard Waring, Oregon State U. Randy Wynne, Virginia Tech Weile Wang, NASA NPP Jennifer Dungan, NASA ARC Ranga Myneni, Boston U. Cristina Milesi, CSU Monterey Bay. - PowerPoint PPT PresentationTRANSCRIPT
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Ramakrishna Nemani, NASA ARC
Richard Waring, Oregon State U.
Randy Wynne, Virginia Tech
Weile Wang, NASA NPP
Jennifer Dungan, NASA ARC
Ranga Myneni, Boston U.
Cristina Milesi, CSU Monterey Bay
Synergistic use of MODIS and Landsat data for mapping global forest carbon fluxes
LDCM LST July 15, 2008
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1. Integration of satellite data with modeling
• Description of the Terrestrial Observation and Prediction System (TOPS)• A brief review of current TOPS applications• Potential for integrating Landsat data
2. Mapping global forest carbon fluxes
• Motivation• Approach• Key assumptions• Prototype activities• Global mapping with Google academic computing
outline
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Monitoring
Modeling
Forecasting
Multiple scales
Nemani et al., 2003, EOM White & Nemani, 2004, CJRS
A data-Modeling framework
Predictions are based onchanges in biogeochemicalcycles
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Data – Model Integration in TOPS
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Streamflow network Soil moisture network
FluxnetWeather network
Access to a variety of observing networks
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Access to a variety of remote sensing platforms
Integration across Platforms, Sensors, Products, DAACs ..Non-trivial
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Ability to integrate a variety of models
Biogeochemical CyclingCrop growth/yieldPest/Disease Global carbon cycle
Prognostic/diagnostic models
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Ability to work across different time and space scalesHours Decades
Vineyard water balance Continental Carbon Balance
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Gridded Weather Surfaces for Californiausing nearly 700 weather stations daily
TMAXTMIN
VPD
SRADPRECIP
maps come with cross-validation statistics
Weather networks often operatedby different govt. agencies and/or private industry. Rarely integratedbecause they are intended fordifferent audiences. We specializein bringing them together to providespatially continuous data.
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Daily satellite mapping of CA landscapes
SNOW COVER VEGETATION DENSITY
VEGETATION PHENOLOGY FIRE
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California : Ecological Daily Nowcast at 1km
Biome-BGCSimulation models
Outputs include plant growth, irrigation demand, streamflow
T P
RAD
Climate + Satellite Carbon and water cycles
ET
[Feb/01/2006]
0 2.5 5
GPP
GPP (gC/m2/d) ET (mm/d)
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Daily Nowcasts: California
Meteorology Hydrology Vegetation Ecosystem
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Weekly Ecocasts: CaliforniaCurrent Data Historical Data Anomaly Detection
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Correlations between temperatures and mosquito abundance in CA
Using TOPS Data to Identify Drivers of Mosquito Abundance and Virus Transmission Risk in California and western U.S.
These relationships are being used to develop predictive models.
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TOPS products for NOAA Fisheries: Forecasting Stream Temperature for Anadromous Fisheries Management
TOPS data and regional climate models will drive forecasts of steam temperature developed by NOAA Fisheries. Forecasts will be used in decision making related to water releases for management of habitat for endangered fish species.
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0 30
Forecast Irrigation (mm)
Irrigation Forecast for week of July 19-26, 2005
Tokalon Vineyard, Oakville, CA
CIMIS Measured Weather Data through July 18, 2005
NWS Forecast Weather Data July 19-26, 2005
0 1000meters N
Irrigation Forecasts
Fully automated web delivery to growers
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Moving from pools to fluxes
Flux towers shedding light on carbon cycling
MODIS algorithms
Availability of global Landsat data
Access to computing resources
Strong interest from Google Earth
Mapping global forest carbon fluxes
Motivation
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•Not to convince scientists
•Mainly to educate the public about climate change & Kyoto protocol
•Great to show we can do it at 30m globally
Education vs Science
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•Leaf Area Index can be used to scale carbon fluxes such as Gross Primary Production (GPP)
•Ratio between GPP and NEP (Net Ecosystem Production) is fairly constant for mature stands
•We can rely on remote sensing to map recent disturbances that deviate from a constant NEP/GPP ratio
Assumptions
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Climate and LAI interactions captured by BIOME-BGC
Relation between LAI and GPP depends on the climate
Standard MODIS LAI and GPP products are available at 1km
Landsat data have been widely used to estimate LAI (NDVI, SR, RSR)
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Fluxnet data are useful in simplifying carbon cycling
NEP/GPP ratio appears to be conservative, 0.25-0.30 for mature stands.Recently disturbed sites deviate from this, and are often large C sources (-0.8).
If we know, land cover, LAI and climate, GPP is relatively easy to estimate,Standard MODIS GPP algorithm does this globally at 1km.
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Managed Forests of Southeast
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MODIS Carbon Fluxes
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Leaf Area Index
ND
VIm
Mapping LAI from Thematic Mapper
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Leaf Area Index
ND
VI\N
DVI
m
Ability to map recent disturbances
Disturbances
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Net Ecosystem Production
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•Google Academic Computing 1000 clusters, over 30,000 CPUs
Over 100 Pb of storage
A new layer on Google Earth
Global Mapping
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Summary
Exciting opportunities for integratingLandsat data into operational DSS
Lot of interest from private sector
We may have resources to routinely process global Landsat data sets
Collaboration with Google Earth opens new opportunities for validation