CarbonTracker-Lagrange (CT-L) is a new regional inverse modeling framework currently under development and designed for estimating North American greenhouse gas emissions and uptake fluxes. CT-L uses surface sensitivity footprints from Lagrangian Particle Dispersion Models driven by high-resolution meteorological simulations. Surface fluxes are optimized for a consistency with a variety of in situ and remote sensing observations of CO2 using Bayesian and geostatistical inverse modeling techniques. A beta footprint product is available for download now, and more products are coming soon.
Atmospheric Transport Model:
CT-L uses a high-resolution WRF-STILT atmospheric transport model customized for Lagrangian simulations (Nehrkorn et al., Meteorol. Atmos. Phys., 107, 2010). Species independent 10-day surface footprints are computed and stored for each measurement along with back-trajectories.
CT-L uses an efficient inverse modeling framework described by Yadav and Michalak [Geoscientific Model Development, 6, 583-590, 2013] implemented at NOAA in python and modified to include boundary value optimization similar to the method of Lauvaux et al. [Atmospheric Chemistry and Physics, 12(1), 337-354, 2012]. The fast sparse-matrix algorithms enable ensembles of calculations to test sensitivity to data-weighting scenarios, mathematical construct(form of state vector; Bayesian versus geostatistical optimization), and prior information.
Support for CT-L has been provided by the NOAA Climate Program Office’s Atmospheric Chemistry, Carbon Cycle, & Climate (AC4) Program and the NASA Carbon Monitoring System.
CT-L Modeling team:
- NOAA & CIRES: A. Andrews, K. Thoning, M. Trudeau, R. Draxler, A. Stein, L. Hu, L. Bruhwiler, J. Miller, H. Chen, C. Alden, K. Masarie, A. Karion
- AER, Inc.: J. Eluszkiewicz, T. Nehrkorn, M. Mountain
- Carnegie Institution for Science/Stanford: A. Michalak, V. Yadav, Mae Qui
- Colorado State University: C. O’Dell
- Harvard University: S. Wofsy, B. Xiang, S. Miller, J. Benmergui
CT-L Data Providers:
- NOAA Earth System Research Laboratory’s Global Monitoring Division
- Penn State University (K. Davis, S. Richardson, N. Miles)
- NCAR (B. Stephens)
- Oregon State University (B. Law, A. Schmidt)
- Lawrence Berkeley National Lab (M. Torn, S. Biraud, M. Fischer)
- Earth Networks (C. Sloop)
- Environment Canada (D. Worthy)
- Harvard University (S. Wofsy, J. W. Munger)
- U of Minnesota (T. Griffis)
- CalTech (D. Wunch, P. Wennberg; S. Newman) & JPL (G. Toon)
- GOSAT-ACOS team
- Yadav and Michalak: http://www.geosci-model-dev.net/6/583/2013/gmd-6-583-2013.html
- Lauvaux et al.: http://www.atmos-chem-phys.net/12/337/2012/acp-12-337-2012.html
- Nehrkorn et al.: http://link.springer.com/article/10.1007%2Fs00703-010-0068-x