Zhen Liu, Cosmin Safta, Khachik Sargsyan, Bart G. van Bloemen Waanders, Ray P. Bambha, Hope A. Michelsen Sandia National Laboratories, CA/NM Tao Zeng Georgia.

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Presentation transcript:

Zhen Liu, Cosmin Safta, Khachik Sargsyan, Bart G. van Bloemen Waanders, Ray P. Bambha, Hope A. Michelsen Sandia National Laboratories, CA/NM Tao Zeng Georgia Department of Natural Resources, GA CMAS October 2012

NRC, 2010: Verifying Greenhouse Gas Emissions: Methods to Support International Climate Agreements, pp16, Fig. 1.3 Growing fossil fuel CO 2 emissionRising atmospheric CO 2 concentrations

Global: NRC, Country: EPA, State, county and 1-10km: Gurney et al., 2009, ES&T [Marland, 2008, J. Ind. Ecol., 136–139] Annual average (higher uncertainty after temporal allocation) gridded

Aircraft Satellite GOSAT (Los Angeles Basin, CA) [Kort et al., 2012, GRL] 3.2±1.5 ppm [Mays et al., 2009, ES&T] (Indianapolis, IN) Model? “A signal-to-noise problem”

 Goals:  Quantitatively examine model skills/errors on different time/spatial scales;  Develop model diagnostics and inverse modeling approach to pinpoint fossil fuel emissions;  Construct regional CO 2 budget and quantify its uncertainties.  Add a CO 2 module in CMAQ  Widely used and well tested CTM, large user community;  Highly modularized codes makes adding species/processes easy;  Adaptable nested model domains enables high resolution modeling.

(done/under development)  CMAQ: version 5.0  Meteorology:WRF  BC/IC:CarbonTracker (CT) (3°× 2°; 3-hourly)  Biosphere flux:(1) CarbonTracker (CASA) (1°× 1°) (2) VPRM (3) Sib3  Fossil fuel emission: (1) CDIAC (1°× 1°; monthly) (2) VULCAN (2002; 10km; hourly)  Fire emission:GFEDv3.1 (0.5°× 0.5°; 3-hourly)  Chemistry:CB-05  CO 2  Oceans flux:CarbonTracker  Benchmark: Oct. 2007, U.S. 36km, 22L

Root Mean Square Deviation (RMSD) = 0.47 ppm CMAQ-CDIACCarbonTracker

CMAQ-VULCANCarbonTracker Root Mean Square Deviation (RMSD) = 0.48 ppm

CMAQ-VULCANCarbonTracker Some hotspots could still be seen (> 4ppm enhancement) Root Mean Square Deviation (RMSD) = 0.43 ppm

40mile north of Denver; elev masl; 300m above ground

Transport difference between CMAQ (36km) and TM5 (1°× 1°) only leads to 0.47 ppm Root Mean Square Deviation (RMSD) near the surface in terms of monthly mean CO 2 distribution. 36km CMAQ with hourly VULCAN (10km) emission inventory is capable of capturing urban CO 2 hotspots in the contiguous U.S. and diurnal pattern of CO 2 downwind of urban Denver. Some hotspots might be observed using the PBL column average metric.  Implementing finer resolution biosphere module (VPRM) and transport;  Adding secondary CO 2 source (oxidation of CO and VOCs) in CMAQ;  Comprehensive model evaluation with tower and aircraft data.

 CarbonTracker-2011 results are provided by NOAA ESRL (  Tower CO 2 data are provided by NOAA GMD.  WRF output and non-CO 2 emission data are shared by the SESARM project (  Funding for this work was provided by Sandia National Laboratories, Laboratory Directed Research And Development Program.

AMT

LEF

WKT

WBI

CMAQ-VULCANCarbonTracker (500m above ground)

Meteorology:ECMWF (1°× 1° nested over NA) Biosphere:Carnegie-Ames-Stanford-Approach (CASA) Ocean:[Jacobson et al., 2007] Fossil fuel:CDIAC [Oda and Maksyutov, 2011] Fire:GFEDv3.1 Observations:NOAA ESRL, CSIRO, IPEN-CQMA [Peters et al., 2007, PNAS]