GEOS-CARB: A Framework for Monitoring Carbon Concentrations and Fluxes Steven Pawson 1, Lesley Ott 1, David Baker 2, George J. Collatz 1, Janusz Eluszkiewicz.

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Presentation transcript:

GEOS-CARB: A Framework for Monitoring Carbon Concentrations and Fluxes Steven Pawson 1, Lesley Ott 1, David Baker 2, George J. Collatz 1, Janusz Eluszkiewicz 3, Watson Gregg 1, Stephan R. Kawa 1, Thomas Nehrkorn 3, Tomohiro Oda 2, Chris O’Dell 2, Cecile Rousseaux 1,4, Andrew Schuh 2, Brad Weir 1,4 1 NASA Goddard Space Flight Center 2 Colorado State University 3 Atmospheric and Environmental Research 4 Universities Space Research Association

GEOS-Carb Phase 2a Goals Move from CMS Flux Pilot Project (FPP) towards global, integrated, carbon modeling Extend land and ocean fluxes and evaluation over a longer time period ( ) Incorporate new, high resolution fossil fuel flux estimates Evaluate flux estimates using atmospheric CO 2 observations Apply carbon data assimilation techniques to inform source and sink estimates Develop and evaluate CO 2 inversion techniques Flux Pilot Project Prototype Models GEOS-Carb I Maturation, Integration of models GEOS-Carb II Deliver mature flux and concentration products GEOS-Carb II Deliver mature flux and concentration products

GEOS-5 Atmospheric CO 2 Simulations Assimilation of Satellite CO 2 Observations Flux Assessment Using Atmospheric CO 2 CO 2 Observations In situ, TCCON, GOSAT, OCO-2 CASA-GFED NOBM ODIAC Land Flux Ocean Flux Fossil Fuel fPAR, Fires Ocean Color Night Lights Model Product Data Atmospheric Observations MERRA Reanalysis Meteorology Maturation of Inversion Techniques GEOS-Carb Modeling System

Ocean carbon flux – assessing uncertainty due to meteorological forcing 4 reanalyses datasets used to force the NOBM to estimate FCO 2 Global FCO 2 were insensitive to the choice of forcing reanalysis All global FCO 2 estimates were within 20% of in situ estimates High latitudes and tropics had largest ranges in estimated FCO 2 among the reanalyses No individual reanalysis was uniformly better or worse in the major oceanographic basins. Gregg W.W., N.W. Casey and C.S. Rousseaux, Sensitivity of Simulated Global Ocean Carbon Flux Estimates to Forcing by Reanalysis Products. Ocean Modelling, 80, 24-35

Ocean carbon flux – Effects of chlorophyll assimilation on CO 2 flux estimates Assimilation of chlorophyll decreases the uncertainty in chlorophyll concentration Global FCO 2 produced in the free-run and after assimilation were within -0.6 mol C m -2 y -1 of the observations. The FCO 2 values were not strongly impacted by the assimilation, and the uncertainty in FCO 2 was not decreased Chlorophyll aAir-Sea Fluxes FCO 2 Rousseaux C.S. and W.W. Gregg, The Effects of Chlorophyll Assimilation on Carbon Fluxes in a Global Biogeochemical Model. NASA Technical Report Series on Global Modeling and Data Assimilation, NASA TM , Vol. 33, 22 pp.

Land carbon flux – Development and evaluation of CASA/GFED3 Satellite data constraints: -Seasonal/interannual phenology: monthly GIMMS AVHRR NDVI -Woody allocation: MODIS Vegetation Continuous Fields -Vegetation class: MODIS Land Cover Type -Seasonal/interannual burned area (daily): MODIS Surface Reflectance & Fire detections Inputs: Meteorology (MERRA), Satellite derived vegetation states, Satellite derived fires/burned area Outputs: 1/2 o monthly NPP, Rh, Fire emissions (daily) Outputs scaled to 3 hourly 1x1.25 o GPP, RE, and fire for transport model Data available for from link on CMS website. More details in J. Collatz’s talk and poster. NPP Mortality Atmospheric Carbon Dead Carbon Pools Live Carbon Pools Respiration Fire

Evaluation of carbon fluxes using atmospheric CO 2 observations Completed manuscript assessing the ability of different CO 2 measurements to detect differences between flux estimates (Ott et al., in revision for JGR, 2014) Longer simulations facilitate evaluation of interannual variability represented in fluxes. Example shows simulated and observed column CO 2 at the Park Falls, WI TCCON site GOSAT zonal mean XCO 2 GEOS-5 zonal mean XCO 2 Sim - Obs Difference due to land flux estimate Assessment of Interannual Variability in CASA-GFED3

Refining tools that inform flux estimates – carbon data assimilation GEOS-Carb sought to integrate higher resolution fossil fuel emissions datasets into the GEOS- modeling system CO and CO 2 assimilation experiments using different combinations of fluxes help to identify causes of disagreement between models and observations 2013 ODIAC Emissions Assessment of Flux Errors Using Data Assimilation

Refining tools that inform flux estimates – inversion methodology Ported and tested 4DVar inversion code developed at CSU to NASA high-end computing systems – development will support higher resolution inverse methods (more details in D. Baker talk tomorrow) NOAA in situ + TCCON GOSAT 3-point scan OCO-2 best guess ASCENDS 1.57 μ m, 0.5 ppm RRV ASCENDS 2 μ m, 0.5 ppm RRV ASCENDS 2 μ m, 0.25 ppm RRV UNCERTAINTY REDUCTION, monthly flux estimates

Refining tools that inform flux estimates – inversion methodology GEOS-Carb also supported development of techniques to minimize the impact of observation bias on top-down flux estimates In these OSSEs, a hypothetical tropical sink is diagnosed in the wrong locations because of a small land-ocean bias contained in the psuedo observations (top) Bottom plot shows that when the bias is solved for along with flux corrections, the true pattern of fluxes is better diagnosed Results of ‘bias-aware’ inversion Results of ‘bias-unaware’ inversion Estimated Flux - Truth

Conclusions GEOS-Carb seeks to continue the progress of the FPP toward integrated, observation informed modeling tools Land and ocean fluxes are available for the years ODIAC fossil fuel emissions available upon request. We continued to use atmospheric transport models and data to evaluate and refine flux estimates Also introduced CO and CO 2 data assimilation using multiple emissions datasets to identify causes of model- data discrepancies Worked to mature inversions techniques by developing new methods to treat observation biases, building towards higher resolution inversions in the future GEOS-Carb II (2014 funded project) will build upon the foundation of the FPP and GEOS-Carb (2012) to provide model-based flux and concentration products to the carbon monitoring community (see L. Ott presentation Friday)