All models are wrong … we make tentative assumptions about the real world which we know are false but which we believe may be useful … the statistician.

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Anna M. Michalak Department of Civil and Environmental Engineering

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Presentation transcript:

All models are wrong … we make tentative assumptions about the real world which we know are false but which we believe may be useful … the statistician knows, for example, that in nature there never was a normal distribution, there never was a straight line, yet with normal and linear assumptions, known to be false, he can often derive results which match, to a useful approximation, those found in the real world. (Box, 1976) Source: Kim Mueller, UM

Determining Regional Emissions Patterns of Greenhouse Gases Anna M. Michalak 1, Sharon M. Gourdji 1, Kim Mueller 1, Deborah Huntzinger 1, Vineet Yadav 1, Adam Hirsch 2,3, Arlyn E. Andrews 2, Thomas Nehrkorn 4 1 The University of Michigan 2 NOAA Earth Systems Research Laboratory 3 University of Colorado 4 Atmospheric and Environmental Research, Inc.

North American Carbon Program  Science questions: Diagnosis – What is the carbon balance of NA? Attribution – What processes control sources and sinks? Prediction – How will the carbon balance evolve? Decision support – How can we manage the carbon cycle?

Fossil fuelsRa Total CO 2 flux CO 2 SourceCO 2 Sink GPP Rh Disturbance Measurement location Top-down Bottom-up Source: Kim Mueller, UM

Synthesis Bayesian Inversion Meteorological Fields Transport Model Sensitivity of observations to fluxes (H) Residual covariance structure (Q, R) Prior flux estimates (s p ) CO 2 Observations (y) Inversion Flux estimates and covariance ŝ, V ŝ Biospheric Model Auxiliary Variables ? ?

TransCom, Gurney et al Large Regions Inversion

Bottom-Up Estimates Deborah Huntzinger, U. Michigan Deciduous Broad-Leaf ForestsGrasslands

Synthesis Bayesian Inversion Meteorological fields Transport model Sensitivity of observations to fluxes (H) Residual covariance structure (Q, R) Prior flux estimates (s p ) CO 2 observations (y) Inversion Flux estimates and covariance ŝ, V ŝ Biospheric model Auxiliary variables

Geostatistical Inversion Meteorological fields Transport model Sensitivity of observations to fluxes (H) Residual covariance structure (Q, R) Auxiliary variables (X) CO 2 observations (y) Variable selection Inversion Covariance optimization Flux estimates and covariance ŝ, V ŝ Trend estimate and covariance β, V β select significant variables optimize covariance parameters

Geostatistical Approach to Inverse Modeling  Geostatistical inverse modeling objective function: H = transport information, s = unknown fluxes, y = CO 2 measurements X and  define the model of the trend R = model data mismatch covariance Q = spatio-temporal covariance matrix for the flux deviations from the trend Deterministic component Stochastic component

Features of GIM  Minimizes a priori assumptions: Does not require prior estimates of fluxes Provides strongly data driven estimates Does not assume fixed “patterns” within regions or biomes  Uses available auxiliary information  Minimizes aggregation errors  Provides independent estimates  Can be applied directly at multiple spatial and temporal scales  Can be used to infer scale-specific process-based understanding  Provides path to ecosystem model improvement

Global Gridscale CO 2 Flux Estimation Estimate global monthly CO 2 fluxes (ŝ) at 3.75°x5° for 1997 to 2001 in a GIM framework using:  CO 2 flask data from NOAA-ESRL network (y)  TM3 (atmospheric transport model) (H)  Auxiliary environmental data (X)

Global Gridscale CO 2 Flux Estimation S. Gourdji January 2000 Gourdji et al. (JGR 2008)

Annual Average Biospheric Flux Mueller et al. (JGR, 2008)

Global/ bottom-up comparison Background

North American CO 2 Flux Estimation Estimate North American monthly/ weekly/ daily CO 2 fluxes (ŝ) at 1°x1° for 2004 to 2007 in a GIM framework using:  CO 2 continuous measurements (y)  STILT Lagrangian atmospheric transport model (H)  Auxiliary environmental data (X) LAI June 2004 WRF domains and locations of continuous measurements T. Nehrkorn Sample influence function, June 2004

Recovered fluxes (F8d/C3hr-aft) Source: Sharon Gourdji (UM) and Adam Hirsch (NOAA ESRL)

Auxiliary variable selection Objective 3: N.A. CO 2 fluxes for 2004 Biospheric Variables Anthropogenic Variables Biomes Net Primary Production (ISLSCP2) Home Heating Crop Type (e.g. %Corn or Wheat) NDVI Impervious Surfaces (%) Cropland Carbon PAR (Shortwave radiation) Night-time Lights Enhanced Vegetation Index (MODIS) Precipitation NOx Emissions Evapotranspiration (GLDAS) Sensible Heat Flux (GLDAS) Population Density (Landscan) Fire Radiative Power (MODIS) Soil Organic Carbon Density (ISLSCP2) Power Plant Emissions Fire Emissions (GFED) Soil Moisture (AMSR) SO2 Emissions fPAR (MODIS) Soil Moisture (GLDAS) Vulcan Fossil Fuel Emissions GPP (MODIS) Soil Nitrogen Density (ISLSCP2) EDGAR Fossil Fuel Emissions LAI (MODIS) Soil Respiration Emissions (CDIAC) Land Cover (MODIS) Soil Texture (ISLSCP2) Land Surface Water Index Temperature - Air (GLDAS) Latent Heat Flux (GLDAS) Temperature - Soil (GLDAS)

Scalability

3.75 o x 5.0 o ―: est. flux ―: CASA ― : X km 2 -- : NEE -- : X 1 o x 1 o -. : CASA/SiB

Key Differences for Non-CO 2 Inversions  Larger variety of types of sources  Point vs. areal sources  Chemistry  Cannot “pre-subtract” fossil fuel emissions  Multi-species inversions  Available data: Types (flask, continuous, aircraft, flux, remote sensing) Quantity of available atmospheric information Inventories and auxiliary data  Availability of prior information

GOT MET? A. Hirsch T. Nehrkorn

Conclusions  Geostatistical approach Yields strongly atmospheric data driven estimates of flux variability Can be used to estimate fluxes at fine resolutions, without the use of prior flux estimates Allows benefit of auxiliary data to be evaluated Allows fluxes and the influence of auxiliary data to be estimated concurrently (w/ uncertainties)  Geostatistical approach offers an opportunity to examine processes across spatial and temporal scales  Use of auxiliary variables within a geostatistical framework can be used to derive process-based understanding directly from an inverse model

Acknowledgments  Research group: Alanood Alkhaled, Abhishek Chatterjee, Sharon Gourdji, Deborah Huntzinger, Kim Mueller, Shahar Shlomi, Vineet Yadav, and Yuntao Zhou  Kevin Gurney (Purdue U.)  Peter Curtis (Ohio State U.)  Christian Rödenbeck (MPIB)  Kevin Schaefer (NSIDC)  Data providers: Marc Fischer (LBL), Sherri Heck (NCAR), Andy Jacobson (NOAA), Natasha Miles (Penn State), Wouter Peters (NOAA), Scott Richardson (Penn State), Britt Stephens (NCAR), Margaret Torn (LBL), Tris West (ORNL), Steve Wofsy (Harvard), Doug Worthy (MSC), Jeff Morisette (NASA), ISLSCP II, LEDAPS, MOD14, GEIA, MODIS, GOES, TERRASTAT, GPCP, NSIDC, TOPS, NLDAS, NOAA-ESRL cooperative air sampling network  Funding sources: