We list below the major new GEOS-Chem developments in v11-02 (released May 2018) and v11-01 (released May 2017). We encourage you to offer co-authorship on publications if these developments have benefited your work. This page is reviewed by the GEOS-Chem Steering Committee at every new version release. Older developments listed lower down in a separate section are adequately credited by citation following the guidelines in the Narrative GEOS-Chem Description page. For questions or guidance please contact the relevant Working Group Chair or Model Scientist. For new developments in the adjoint model see the adjoint wiki page.

New developments in GEOS-Chem v11-02

• (11-02) High-performance GEOS-Chem (GCHP). Developers: Seb Eastham (MIT), Lizzie Lundgren (Harvard), Jiawei Zhuang (Harvard). Reference: Eastham, S.D., M.S. Long, C.A. Keller, E. Lundgren, R.M. Yantosca, J. Zhuang, C. Li, C.J. Lee, M. Yannetti, B.M. Auer, T.L. Clune, J. Kouatchou, W.M. Putman, M.A. Thompson, A.L. Trayanov, A.M. Molod, R.V. Martin, and D.J. Jacob, GEOS-Chem High Performance (GCHP): A next-generation implementation of the GEOS-Chem chemical transport model for massively parallel applications , Geosci. Mod. Dev. Discuss., https://doi.org/10.5194/gmd-2018-55, 2018.

• (11-02) Updated black carbon absorption properties. Developers: Xuan Wang (Harvard) and Colette Heald (MIT). Reference: Wang, X., Heald, C. L., Ridley, D. A., Schwarz, J. P., Spackman, J. R., Perring, A. E., Coe, H., Liu, D., and Clarke, A. D.: Exploiting simultaneous observational constraints on mass and absorption to estimate the global direct radiative forcing of black carbon and brown carbon, Atmos. Chem. Phys., 14, 10989-11010, doi:10.5194/acp-14-10989-2014, 2014.

• (11-02) CEDS global anthropogenic emission inventory. Implementer: Lu Shen (Harvard)

• (11-02) EDGAR v4.3.1 global anthropogenic emission inventory. Implementer: Chi Li (Dalhousie)

• (11-02) New global ethane emissions. Developer: Zitely Tzompa-Sosa and Emily Fischer (Colorado State U.). Reference: Tzompa-Sosa, Z. A., Mahieu, E., Franco, B., Keller, C. A., Turner, A. J., Helmig, D., et al. (2017). Revisiting global fossil fuel and biofuel emissions of ethane. Journal of Geophysical Research: Atmospheres, 122(4), 2493–2512. http://doi.org/10.1002/2016JD025767

• (11-02) DICE-Africa emission inventory for Africa. Developers: Eloise Marais (U. Birmingham) and Christine Wiedinmyer (NCAR). Reference: Marais, E. and C. Wiedinmyer, Air quality impact of Diffuse and Inefficient Combustion Emissions in Africa (DICE-Africa), Environ. Sci. Technol., 50(19), 10739–10745, doi:10.1021/acs.est.6b02602, 2016.

• (11-02) Acetaldehyde emissions from vegetation and the ocean. Developer: Dylan Millet (U. Minnesota). Reference: Millet, D.B., et al., Global atmospheric budget of acetaldehyde: 3D model analysis and constraints from in-situ and satellite observations, Atmos. Chem. Phys., 10, 3405-3425, 2010.

• (11-02) Ammonia emissions from Arctic seabirds. Developers: Betty Croft and Randall Martin (Dalhousie). Reference: Croft, B., G. R. Wentworth, R. V. Martin, W. R. Leaitch, J. G. Murphy, B. N. Murphy, J. K. Kodros, J. P. D. Abbatt and J. R. Pierce, Contribution of Arctic seabird-colony ammonia to atmospheric particles and cloud-albedo radiative effect, Nat. Commun., 7:13444, doi:10.1038/ncomms13444, 2016.

• (11-02) Natural ammonia emissions. GEIA inventory. Implementer: Eleanor Morris (U. York)

• (11-02) Lightning emission updates. Developer: Lee Murray (U. Rochester). Reference: lightning wiki page /p>

• (11-02) PAN chemistry. Developer: Emily Fischer (Colorado Sate U.). Reference: Fischer, E.V., D.J. Jacob, R.M. Yantosca, M.P. Sulprizio, D.B. Millet, J. Mao, F. Paulot, H.B. Singh, A.-E. Roiger, L. Ries, R.W. Talbot, K. Dzepina, and S. Pandey Deolal, Atmospheric peroxyacetylnitrate (PAN): a global budget and source attribution, Atmos. Chem. Phys., 14, 2679-2698, 2014.

• (11-02) New isoprene oxidation mechanism. Developers: Katie Travis (MIT), Jenny Fisher (U. Wollongong), Eloise Marais (U. Birmingham), Chris Chan Miller (Harvard-SAO), Kelvin Bates (Harvard), Becky Schwantes (Caltech). References:

• Travis, K. R., D. J. Jacob, J. A. Fisher, P. S. Kim, E. A. Marais, L. Zhu, K. Yu, C. C. Miller, R. M. Yantosca, M. P. Sulprizio, A. M. Thompson, P. O. Wennberg, J. D. Crounse, J. M. St. Clair, R. C. Cohen, J. L. Laughner, J. E. Dibb, S. R. Hall, K. Ullmann, G. M. Wolfe, J. A. Neuman, and X. Zhou, Why do models overestimate surface ozone in the Southeast United States, Atmos. Chem. Phys., 16, 13561-13577, doi:10.5194/acp-16-13561-2016, 2016.

• Fisher, J.A., D.J. Jacob, K.R. Travis, P.S. Kim, E.A. Marais, C. Chan Miller, K. Yu, L. Zhu, R.M. Yantosca, M.P. Sulprizio, J. Mao, P.O. Wennberg, J.D. Crounse, A.P. Teng, T.B. Nguyen, J.M. St. Clair, R.C. Cohen, P. Romer, B.A. Nault, P.J. Wooldridge, J.L. Jimenez, P. Campuzano-Jost, D.A. Day, P.B. Shepson, F. Xiong, D.R. Blake, A.H. Goldstein, P.K. Misztal, T.F. Hanisco, G.M. Wolfe, T.B. Ryerson, A. Wisthaler, and T. Mikoviny. Organic nitrate chemistry and its implications for nitrogen budgets in an isoprene- and monoterpene-rich atmosphere: constraints from aircraft (SEAC4RS) and ground-based (SOAS) observations in the Southeast US. Atmos. Chem. Phys., 16, 2961-2990, 2016

• Marais, E. A., D. J. Jacob, J. L. Jimenez, P. Campuzano-Jost, D. A. Day, W. Hu, J. Krechmer, L. Zhu, P. S. Kim, C. C. Miller, J. A. Fisher, K. Travis, K. Yu, T. F. Hanisco, G. M. Wolfe, H. L. Arkinson, H. O. T. Pye, K. D. Froyd, J. Liao, V. F. McNeill, Aqueous-phase mechanism for secondary organic aerosol formation from isoprene: application to the southeast United States and co-benefit of SO2 emission controls, Atmos. Chem. Phys., 16, 1603-1618, 2016.

• Chan Miller, C., D.J.Jacob, E.A. Marais, K. Yu, K.R. Travis, P.S. Kim, J.A. Fisher, L. Zhu, G.M. Wolfe, F.N. Keutsch, J. Kaiser, K.-E. Min, S.S. Brown, R.A. Washenfelder, G. Gonzalez Abad, and K. Chance, Glyoxal yield from isoprene oxidation and relation to formaldehyde: chemical mechanism, constraints from SENEX aircraft observations, and interpretation of OMI satellite data, Atmos. Chem. Phys., 17, 8725-8738, 2017.

• (11-02) Integrated halogen (Cl-Br-I) chemistry. Developers: Thomas Sherwen and Mat Evans (U. York), Seb Eastham (MIT), Lei Zhu (Harvard). Reference: Sherwen, T.,J.A. Schmidt, M.J. Evans, L.J. Carpenter, K. Grossmann, S.D. Eastham, D.J. Jacob, B. Dix, T.K. Koenig, R. Sinreich, I. Ortega, R. Volkamer, A. Saiz-Lopez, C. Prados-Roman, A.S. Mahajan, and C. Ordonez, Global impacts of tropospheric halogens (Cl, Br, I) on oxidants and composition in GEOS-Chem, Atmos. Chem. Phys., 16, 12239-12271, 2016.

• (11-02) HOBr + S(IV) chemistry. Developers: Qianjie Chen and Becky Alexander (U. Washington). Reference: Chen, Q., J.A. Schmidt, V. Shah, L. Jaegle, T. Sherwen, and B. Alexander, Sulfate production by reactive bromine: Implications for the global sulfur and reactive bromine budgets, Geophys. Res. Lett., 44, 7069-7078, 2017.

• (11-02) In-cloud SO2 oxidation by transition metals. Developers: Becky Alexander and Viral Shah (U. Washington). Reference: Alexander, B., Park, R.J., Jacob, D.J., and Gong, S., Transition metal catalyzed oxidation of atmospheric sulfur: Global implications for the sulfur budget, J. Geophys. Res., 114, D02309, 2009.

• (11-02) Aqueous-phase isoprene SOA. Developer: Eloise Marais (U. Birmingham). Reference: Marais, E. A., D. J. Jacob, J. L. Jimenez, P. Campuzano-Jost, D. A. Day, W. Hu, J. Krechmer, L. Zhu, P. S. Kim, C. C. Miller, J. A. Fisher, K. Travis, K. Yu, T. F. Hanisco, G. M. Wolfe, H. L. Arkinson, H. O. T. Pye, K. D. Froyd, J. Liao, V. F. McNeill, Aqueous-phase mechanism for secondary organic aerosol formation from isoprene: application to the southeast United States and co-benefit of SO2 emission controls, Atmos. Chem. Phys., 16, 1603-1618, 2016.

• (11-02) Simple organic aerosol. Implementers: Sal Farina and Jeff Pierce (Colorado State U.), Patrick Kim and Daniel Jacob (Harvard), Jenny Fisher (U. Wollongong). Reference: Kim, P.S., D.J. Jacob, J.A. Fisher, K. Travis, K. Yu, L. Zhu, R.M. Yantosca, M.P. Sulprizio, J.L. Jimenez, P. Campuzano-Jost, K.D. Froyd, J. Liao, J.W. Hair, M.A. Fenn, C.F. Butler, N.L. Wagner, T.D. Gordon, A. Welti, P.O. Wennberg, J.D. Crounse, J.M. St. Clair, A.P. Teng, D.B. Millet, J.P. Schwarz, M.Z. Markovic, and A.E. Perring, Sources, seasonality, and trends of Southeast US aerosol: an integrated analysis of surface, aircraft, and satellite observations with the GEOS-Chem model, Atmos. Chem. Phys., 15, 10,411-10,433, 2015.

• (11-02) Methane emissions. Developer/implementer: Bram Maasakkers (Harvard).

• (11-02) New atmospheric chemistry of mercury. Developer: Hannah Horowitz (U. Washington) and Colin Thackray (Harvard). Reference: Horowitz, H.M., D.J. Jacob, Y. Zhang, T.S. Dibble, F. Slemr, H.M. Amos, J.A. Schmidt, E.S. Corbitt, E.A. Marais, and E.M. Sunderland, A new mechanism for atmospheric mercury redox chemistry: implications for the global mercury budget, Atmos. Chem. Phys., 17, 6353-6371, 2017.

• (11-02) New treatment of chemistry in tagged CO simulation. Developer: Jenny Fisher (U. Wollongong). Reference: Fisher, J.A., L.T. Murray, D.B.A. Jones, and N.M. Deutscher, Improved method for linear carbon monoxide simulation and source attribution in atmospheric chemistry models illustrated using GEOS-Chem v9, Geoscientific Model Development, 10, 4129–4144, 2017.

New developments in GEOS-Chem v11-01

• (11-01) FlexChem. Developers: Mike Long (Harvard), Mat Evans (York), Melissa Sulprizio (Harvard), Bob Yantosca (Harvard), Lizzie Lundgren (Harvard).

• (11-01) Optimal timesteps. Developers: Sajeev Philip (Dalhousie), Randall Martin (Dalhoisie). Reference: Philip, S., R.V. Martin, and C.A. Keller, Sensitivity of chemistry-transport model simulations to the duration of chemical and transport operators: a case study with GEOS-Chem v10-01, Geosci. Model Dev., 9, 1683-1695, doi:10.5194/gmd-9-1683-2016, 2016.

• (11-01) Lana DMS climatology. Implementer: Tom Breider (Harvard). Reference: Breider, T.J., L.J. Mickley, D.J. Jacob, C. Ge, J. Wang, M.P. Sulprizio, B. Croft, D.A. Ridley, J.R. McConnell, S. Sharma, L. Husain, V.A. Dutkiewicz, K. Eleftheriadis, H. Skov, and P.K. Hopke, Multi-decadal trends in aerosol radiative forcing over the Arctic: contribution of changes in anthropogenic aerosol to Arctic warming since 1980, J. Geophys. Res., 122(6), 3573–3594, doi:10.1002/2016JD025321, 2017.

• (11-01) Impaction scavenging for hydrophobic BC and homogeneous IN removal. Developer: Qiaoqiao Wang (Max Planck Institute). Reference: Wang, Q., D.J. Jacob, J.R Spackman, A.E. Perring, J.P. Schwarz, N. Moteki, E.A. Marais, C. Ge, J. Wang, and S.R.H. Barrett, Global budget and radiative forcing of black carbon aerosol: constraints from pole-to-pole (HIPPO) observations across the Pacific, J. Geophys. Res., 119, 195-206, 2014.

• (11-01) Improved dust size distribution scheme. Developer: Li Zhang (CU Boulder). Reference: Zhang, L., J. F. Kok, D. K. Henze, Q. Li, and C. Zhao, Improving simulations of fine dust surface concentrations over the western United States by optimizing the particle size distribution, Geophys. Res. Lett., 40, 3270–3275, doi:10.1002/grl.50591, 2013.

• (11-01) Brown carbon UV absorption. Developer: Melanie Hammer (Dalhoisie). Reference: Hammer M.S., R.V. Martin, A van Donkelaar, V. Buchard, O. Torres, D.A. Ridley, and R.J.D. Spurr, Interpreting the ultraviolet aerosol index observed with the OMI satellite instrument to understand absorption by organic aerosols: Implications for atmospheric oxidation and direct radiative effects, Atmos. Chem. Phys., 16, 2507-2523, doi:10.5194/acp-16-2507-2016, 2016.

• (11-01) Acid uptake on dust aerosols. Developer: T. Duncan Fairlie (NASA/LARC). Reference: Fairlie, T. D., D.J. Jacob, J.E. Dibb, B. Alexander, M.A. Avery, A. van Donkelaar, and L. Zhang, Impact of mineral dust on nitrate, sulfate, and ozone in transpacific Asian pollution plumes, Atmos. Chem. Phys., 10, 3999-4012, doi:10.5194/acp-10-3999-2010, 2010.

• (11-01) Online emission of marine POA. Developers: Brett Gantt (NCSU), Matthew Johnson (NASA Ames). Reference: Gantt, B., M.S. Johnson, M. Crippa, A.S.H. Prévôt, and N. Meskhidze, Implementing marine organic aerosols into the GEOS-Chem model, Geosci. Model Dev., 8, 619-629, doi:10.5194/gmd-8-619-2015, 2015.

• (11-01) Updated PAH model. Developer: Carey Friedman (MIT). Reference: Friedman, C. L., Y. Zhang, and N.E. Selin, Climate change and emissions impacts on atmospheric PAH transport to the Arctic, Environ. Sci. Technol., 48 (1), 429-437, 2014

• (11-01) Hg ocean rate coefficients. Developer: Shaojie Song (MIT). Reference: Song, S., N.E. Selin, A.L. Soerensen, H. Angot, R. Artz, S. Brooks, E.-G. Brunke, G. Conley, A. Dommergue, R. Ebinghaus, T.M. Holsen, D.A. Jaffe, S. Kang, P. Kelley, W.T. Luke, O. Magand, K. Marumoto, K.A. Pfaffhuber, X. Ren, G.-R. Sheu, F. Slemr, T. Warneke, A. Weigelt, P. Weiss-Penzias, D.C. Wip, and Q. Zhang, Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling, Atmos. Chem. Phys., 15, 7103-7125, doi:10.5194/acp-15-7103-2015, 2015.

• (11-01) Arctic Hg processes. Developer: Jenny Fisher (Wollongong). References: Fisher, J.A., D.J. Jacob, A.L. Soerensen, H.M. Amos, A. Steffen, and E.M. Sunderland, Riverine source of Arctic Ocean mercury inferred from atmospheric observations, Nature Geoscience, 5, 499-504, 2012; Fisher, J.A., D.J. Jacob, A.L. Soerensen, H.M. Amos, E.S. Corbitt, D.G. Streets, Q. Wang, R.M. Yantosca, and E.M. Sunderland, Factors driving mercury variability in the Arctic atmosphere and ocean over the past thirty years, Global Biogeochem. Cycles, 27, 1226-1235, 2013.

• (11-01) Updated Hg emissions. Developer: Yanxu Zhang (Harvard). Reference: Zhang, Y., D.J. Jacob, H.M. Horowitz, L. Chen, H.M. Amos, D.P. Krabbenhoft, F. Slemr, V. St. Louis, and E.M. Sunderland, Observed decrease in atmospheric mercury explained by global decline in anthropogenic emissions, PNAS, doi:10.1073/pnas.1516312113, 2016.

• (11-01) Updated Hg emissions (cont'd). Developers: Amanda Giang (MIT), Shaojie Song (MIT). Reference: AMAP/UNEP, 2013. AMAP/UNEP geospatially distributed mercury emissions dataset 2010v1.

• (11-01) Updated CO2 data: CDIAC fossil fuel emissions and CASA balanced biosphere fluxes. Developer: Ray Nassar (Environment Canada).

• (11-01) CO2 direct effect on isoprene emissions. Developer: Amos Tai (CUHK). Reference: Tai, A.P.K., L.J. Mickley, C.L. Heald, and S. Wu, Effect of CO2 inhibition on biogenic isoprene emission: Implications for air quality under 2000-to-2050 changes in climate, vegetation, and land use, Geophys. Res. Let., 40, 3479-3483, 2013.

• (11-01) Criegee intermediates. Developers: Dylan Millet (U. Minnesota), Eloise Marais (Harvard). Reference: Millet, D.B., M. Baasandorj, D. K. Farmer, J.A. Thornton, K. Baumann, P. Brophy, S. Chaliyakunnel, J.A. de Gouw, M. Graus, L. Hu, A. Koss, B.H. Lee, F.D. Lopez-Hilfiker, J.A. Neuman, F. Paulot, J. Peischl, I.B. Pollack, T.B. Ryerson, C. Warneke, B.J. Williams, and J. Xu, A large and ubiquitous source of atmospheric formic acid, Atmos. Chem. Phys., 15, 6283-6304, doi:10.5194/acp-15-6283-2015, 2015.

• (11-01) GFED 4.1. Developers: Prasad Kasibhatla (Duke), Christoph Keller (NASA/GSFC).

• (11-01) 0.1° x 0.1° CAC emissions. Implementer: Aaron van Donkelaar (Dalhousie).

• (11-01) TOMAS Jeagle sea salt extension Developer: Jack Kodros (Colorado State).

• (11-01) QFED and FINN emissions for Hg simulation Implementer: Jenny Fisher (Wollongong).

Older Model Developments (v10)

• (10-01) GEOS-Chem HP capability and ESMF compatibility. Developers: Mike Long (Harvard), Bob Yantosca (Harvard). Reference: M.S. Long, R. Yantosca, J. E. Nielsen, C.A. Keller, A. da Silva, M.P. Sulprizio, S. Pawson, D.J. Jacob, Development of a grid-independent GEOS-Chem chemical transport model (v9-02) as an atmospheric chemistry module for Earth System Models, Geosci. Model. Dev., 8, 595-602, 2015.

• (10-01) Flexible buffering zone for the nested model simulations at 0.25° (lat) x 0.3125° (lon) resolution. Developer: Lin Zhang(Peking U.).

• (10-01) Online radiative transfer. Developers: David Ridley (MIT), Colette Heald (MIT). Reference: Heald, C.L., D.A. Ridley, J.H. Kroll, S.R.H. Barrett, K.E. Cady-Pereira, M.J. Alvarado, C.D. Holmes, Beyond Direct Radiative Forcing: The Case for Characterizing the Direct Radiative Effect of Aerosols, Atmos. Chem. Phys., 14, 5513-5527, doi:10.5194/acp-14-5513-2014, 2014.

• (10-01) Harvard-NASA Emissions Component (HEMCO). Developer: Christoph Keller (Harvard). Reference: C. A. Keller, M. S. Long, R. M. Yantosca, A. M. Da Silva, S. Pawson, and D. J. Jacob, HEMCO v1.0: A versatile, ESMF-compliant component for calculating emissions in atmospheric models, Geosci. Model Devel., 7, 1409-1417, 2014.

• (10-01) CO2 emissions. Developer: Ray Nassar (Environment Canada). Reference: Nassar, R., L. Napier-Linton, K. R. Gurney, R. J. Andres, T. Oda, F. R. Vogel, and F. Deng, Improving the temporal and spatial distribution of CO2 emissions from global fossil fuel emission data sets, J. Geophys. Res. Atmos., 118, 917-933, doi:10.1029/2012JD018196, 2013.

• (10-01) GFED4 biomass burning emissions. Developers: Prasad Kasibhatla (Duke), Christoph Keller (Harvard).

• (10-01) FINNv1 biomass burning emissions. Developers: Jenny Fisher (University of Wollongong), Christine Wiedinmyer (NCAR), Jingqiu Mao (GFDL). Reference: Wiedinmyer, C., Akagi, S. K., Yokelson, R. J., Emmons, L. K., Al-Saadi, J. A., Orlando, J. J., and Soja, A. J., The Fire INventory from NCAR (FINN): a high resolution global model to estimate the emissions from open burning, Geosci. Model Dev., 4, 625-641, doi:10.5194/gmd-4-625-2011, 2011.

• (10-01) Updated biogenic emissions based on MEGAN2.1 and CLM plant functional types. Developer: Dylan Millet (UMN). Reference: Hu, L., D.B. Millet, M. Baasandorj, T.J. Griffis, P. Turner, D. Helmig, A.J. Curtis, and J. Hueber, Isoprene emissions and impacts over an ecological transition region in the US Upper Midwest inferred from tall tower measurements, J. Geophys. Res., 120, 3553-3571, doi: 10.1002/2014JD022732, 2015.

• (10-01) Updated PARANOX ship plume model. Developers: Chris Holmes (Florida State), Geert Vinken (Eindhoven). Reference: Holmes, C. D., Prather, M. J., and Vinken, G. C. M., The climate impact of ship NOx emissions: an improved estimate accounting for plume chemistry, Atmos. Chem. Phys., 14, 6801-6812, doi:10.5194/acp-14-6801-2014, 2014.

• (10-01) MASAGE NH3. Developer: Fabien Paulot (NOAA). Reference: Paulot F., Jacob, D.J., Pinder R.W., Bash J.O., Travis, K., Henze D.K., Ammonia emissions in the United States, Europe, and China derived by high-resolution inversion of ammonium wet deposition data: Interpretation with a new agricultural emissions inventory (MASAGE_NH3), J. Geophys. Res., 119, 4,343-4,364, 2014.

• (10-01) EDGAR v4.2 emissions. Developers: Qiang Zhang (Tsinghua), Meng Li (Tsinghua), Sajeev Philip (Dalhousie).

• (10-01) HTAP emissions. Developers: Qiang Zhang (Tsinghua), Meng Li (Tsinghua).

• (10-01) MIX Asian emissions. Developers: Qiang Zhang (Tsinghua), Meng Li (Tsinghua). Reference: Li, M., Zhang, Q., Streets, D. G., He, K. B., Cheng, Y. F., Emmons, L. K., Huo, H., Kang, S. C., Lu, Z., Shao, M., Su, H., Yu, X., and Zhang, Y.: Mapping Asian anthropogenic emissions of non-methane volatile organic compounds to multiple chemical mechanisms, Atmos. Chem. Phys., 14, 5617-5638, doi:10.5194/acp-14-5617-2014, 2014.

• (10-01) NEI2011 North American emissions. Developer: Katie Travis (Harvard).

• (10-01) Two-way coupling between global and nested GEOS-Chem models. Developers: Jintai Lin (Peking U.), Yingying Yan (Peking U.). Reference: Y.-Y. Yan, Lin, J.-T., Y. Kuang, D.-W. Yang, L. Zhang, Tropospheric carbon monoxide over the Pacific during HIPPO: two-way coupled simulation of GEOS-Chem and its multiple nested models, Atmos. Chem. Phys., 14, 12649-12663, doi:10.5194/acp-14-12649-2014, 2014

• (10-01) Universal tropospheric-stratospheric Chemistry eXtension (UCX) mechanism. Developers: Sebastiam Eastham (MIT), Steven Barrett (MIT). Reference: Eastham, S.D., Weisenstein, D.K., Barrett, S.R.H., Development and evaluation of the unified tropospheric-stratospheric chemistry extension (UCX) for the global chemistry-transport model GEOS-Chem, Atmos. Env., 89, 2014.