New GEOS-Chem developments

Last Updated 11 November 2021 (version 13.3.0)

New developments (versions 12.5.0 - 13.3.0) | Older developments

We list below the major new GEOS-Chem developments and their developers from version 12.5.0 (released September 2019) to version 13.3.0 (released November 2021). If these developments have benefited your work we strongly encourage you to offer co-authorship on publications to the relevant developers. This page is reviewed by the GEOS-Chem Steering Committee at every new X.Y version release. Older developments are adequately credited by citation following the guidelines in the Narrative GEOS-Chem Description page. A full version history of GEOS-Chem development can be found on the GEOS-Chem versions wiki 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 versions 12.5.0 - 13.3.0

  • (13.3.0) Extended AeroCom volcanic emissions to May 2020. Developer: Christoph A. Keller (NASA/GSFC)
  • (13.3.0) New size-dependent aerosol dry deposition. Developer: Jeff Pierce (CSU).  Reference: Emerson, E.W., A.L. Hodshire, H.M. DeBolt, K.R. Bilsback, J.R. Pierce, G.R. McMeeking, and D.K. Farmer, Revisiting particle dry deposition and its role in radiative effect estimates, PNAS, 117, 26076-26082, 2020.
  • (13.3.0) Aromatics chemistry. Developers: Kelvin Bates and Ke Li (Harvard). Reference: Bates, K.H., D.J. Jacob, K. Li, P. Ivatt, M.J. Evans, Y. Yan, and J. Lin, Development and evaluation of a new compact mechanism for aromatic oxidation in atmospheric models [preprint], Atmos. Chem. Phys. Discuss.,, in review, 2021.
  • (13.3.0) Ethylene and acetylene chemistry. Developer: Kelvin Bates and Ke Li (Harvard). Reference: Kwon, H.-A., R.J. Park, Y.J. Oak, .C..R. Nowland, S.J. Janz, M. Kowalewski, A. Fried, J. Walega, K.H. Bates, J. Choi, D.R. Blake, A, Wisthaler, J.-H. Woo, Top-down estimates of anthropogenic VOC emissions in South Korea using formaldehyde vertical column densities from aircraft during the KORUS-AQ campaign, Elementa, 9, 00109, 2021.
  • (13.3.0) CH3O2 + OH reaction. Developer: Kelvin Bates (Harvard). Reference: Bates, K.H., Jacob, D.J., Wang, S., Hornbrook, R.S., Apel, E.C., Kim, M.J., Millet, D.B., Wells, K.C., Chen, X., Brewer, J.F., Ray, E.A., Diskin, G.S., Commane, R., Daube, B.C. and Wofsy, S.C., The global budget of atmospheric methanol: new constraints on secondary, oceanic, and terrestrial sourceJ. Geophys. Res., 126,  e2020JD033439, 2021. 
  • (13.3.0) Hydroxymethanesulfonate (HMS) chemistry. Developer: Jonathan Moch (Harvard). Reference: Moch, J.M., E. Dovrou, L.J. Mickley, F.N. Keutsch, Z. Liu, Y. Wang, T.L. Dombek, M. Kuwata, S.H. Budisulistiorini, L. Yang, S. Decesari, M. Paglione, B. Alexander, J. Shao, J.W. Munger, D.J. Jacob, Global importance of hydroxymethanesulfonate in ambient particulate matter: Implications for air quality, J. Geophys. Res., 125, e2020JD032706,, 2020.
  • (13.3.0) Bug fix to cloud entrainment for nitrogen oxides and halogens uptake. The entrainment limitation was not correctly implemented in older versions. The bug was fixed by Viral Shah (Harvard).
  • (13.2.0) Trace metals simulation.  Developer: Jun-Wei Xu (Dalhousie U.).  Reference: Xu, J.-W., R.V. Martin, B.H. Henderson, J. Meng, Y.B. Oztaner, J.L. Hand, A. Hakami, M. Strum, and S.B. Phillips, Simulation of airborne trace metals in fine particulate matter over North America, Atmos. Environ., 214, 116883, 2019.
  • (13.2.0) Blowing snow emissions of sea salt aerosols and bromide. Developers: Jiayue Huang and Lyatt Jaegle (U. Washington).  Reference: Huang, J. and Jaeglé, L.: Wintertime enhancements of sea salt aerosol in polar regions consistent with a sea ice source from blowing snow, Atmos. Chem. Phys., 17, 3699–3712,, 2017.
  • (13.2.0) Improved wet scavenging (as option). Developers: Gan Luo and Fangqun Yu (SUNY Albany) Reference: Luo, G., Yu, F., and Moch, J. M.: Further improvement of wet process treatments in GEOS-Chem v12.6.0: impact on global distributions of aerosols and aerosol precursors, Geosci. Model Dev., 13, 2879–2903,, 2020.
  • (13.1.0) HEMCO 3.0 emission module. Developer: Haipeng Lin (Harvard U.)
    Reference:Lin, H., D.J. Jacob, E.W. Lundgren, M.P. Sulprizio, C.A. Keller, T.M. Fritz, S.D. Eastham, L.K. Emmons, P.C. Campbell, B. Baker, R.D. Saylor, and R. Montuoro, Harmonized Emissions Component (HEMCO) 3.0 as a versatile emissions component for atmospheric models: application in the GEOS-Chem, NASA GEOS, WRF-GC, CESM2, NOAA GEFS-Aerosol, and NOAA UFS models , Geosci. Model Dev. Discuss. [preprint],, in review, 2021.
  • (13.1.0) Methane emission inventory for Mexico. Developer: Tia Scarpelli (Harvard U.)
    Reference: Scarpelli, T.R., D.J. Jacob, C.A. Octaviano Villasana, I.F. Ramirez Hernandez, P.R. Cardenas Moreno, E.A. Cortes Alfaro, M.A. Garcia Garcia, and D. Zavala-Araiza, A gridded inventory of anthropogenic methane emissions from Mexico based on Mexico's National Inventory of Greenhouse Gases and Compounds, Environ. Res. Lett., 15, 105015, 2020.
  • (13.1.0) GCAP 2.0. Developer: Lee Murray (U. Rochester)
    Reference: Murray, L. T., Leibensperger, E. M., Orbe, C., Mickley, L. J., and Sulprizio, M.: GCAP 2.0: A global 3-D chemical-transport model framework for past, present, and future climate scenarios, Geosci. Model Dev. Discuss. [preprint],, in review, 2021.
  • (13.1.0) Diurnal variation of emissions from Chinese power plants. Developers: Hongjian Weng and Jintai Lin (Peking U.)
    Reference: Xiao Liu, Xing Gao, Xinbin Wu, Weilin Yu, Lulu Chen, Ruijing Ni, Yu Zhao, Hongwei Duan, Fuming Zhao, Lilin Chen, Shengming Gao, Ke Xu, Jintai Lin, and Anthony Y. Ku, Updated Hourly Emissions Factors for Chinese Power Plants Showing the Impact of Widespread Ultralow Emissions Technology Deployment, Environ. Sci. Technol., 53, 2570-2578, 2019.
  • (13.1.0) Vertical allocation of CEDS emissions by sector. Developer: Barron Henderson (US EPA)
    Reference: US EPA, Preparation of Emissions Inventories for the Version 7.1 2016 Hemispheric Emissions Modeling Platform. U.S. Environmental Protection Agency, Research Triangle Park, NC, 2019. (see Section 2.1.4)
  • (13.0.0) Streets et al. (2019) mercury emissions inventory Developer: Colin Thackray (Harvard U.)
    Reference: Streets, D.G., et al., Global and regional trends of mercury emissions and concentrations, 2010-2015, Atmos. Environ., 417-427, 2019.
  • (13.0.0) EDGARv4.2 mercury emissions inventory Developer: Amanda Giang (U. British Columbia)
    Reference: Muntean M, Janssens-Maenhout G, Song S, Giang A, Selin NE, Zhong H, Zhao Y, Olivier JG, Guizzardi D, Crippa M, Schaaf E. Evaluating EDGARv4.tox2 speciated mercury emissions ex-post scenarios and their impacts on modelled global and regional wet deposition patterns. Atmospheric Environment. 2018; 184:56-68.
  • (13.0.0) Stretched-grid capability in GCHP Developer: Liam Bindle (Washington U.)
    Reference: Bindle, L., R.V. Martin, M.J. Cooper, E.W. Lundgren, S.D. Eastham, B.M. Auer, T.L. Clune, H. Weng, J. Lin, L.T. Murray, J. Meng, C.A. Keller, S. Pawson, and D.J. Jacob, Grid-stretching capability for the GEOS-Chem 13.0.0 atmospheric chemistry model , Geophys. Model Dev. Discuss, [preprint],, in review, 2021.
  • (13.0.0) GFEI inventory of methane emissions from fuel exploitation Developer: Tia Scarpelli (Harvard)
    Reference: Scarpelli, T.R., D.J. Jacob, J.D. Maasakkers, M.P. Sulprizio, J.-X. Sheng, K. Rose, L. Romeo, J.R. Worden, and G. Janssens-Maenhout, A global gridded (0.1o x (0.1o ) inventory of methane emissions from fuel exploitation based on national reports to the United Nations Framework Convention on Climate Change, Earth System Sci. Data, 12, 563-575, 2020.
  • (13.0.0) Updated CEDS anthropogenic emission iventory, 1970-2017. Developer: Erin McDuffie (Dalhousie U., now at EPA)
    Reference: McDuffie, E. E., S. J. Smith, P. O'Rourke, K. Tibrewal, C. Venkataraman, E. A. Marais, B. Zheng, M. Crippa, M. Brauer, R. V. Martin, A global anthropogenic emission inventory of atmospheric pollutants from sector- and fuel- specific sources (1970- 2017): An application of the Community Emissions Data System (CEDS), Earth System Science Data, 12, 3413-3442, 2020.
  • (13.0.0) Updated ODIAC CO2 emissions to 2019. Implementer: Yi Cao (U. Wollongong)
    Oda, T., Maksyutov, S., and Andres, R. J.: The Open-source Data Inventory for Anthropogenic CO2, version 2016 (ODIAC2016): a global monthly fossil fuel CO2 gridded emissions data product for tracer transport simulations and surface flux inversions, Earth Syst. Sci. Data, doi:10.5194/essd-10-87-2018, 2018.
    Oda, T. and Maksyutov, S.: A very high-resolution (1 km×1 km) global fossil fuel CO2 emission inventory derived using a point source database and satellite observations of nighttime lights, Atmos. Chem. Phys., 11, 543-556, doi:10.5194/acp-11-543-2011, 2011.
  • (12.9.0) Halogen chemistry [Wang et al., 2021]. Developers: Xuan Wang (City U. of Hong Kong) and Tomas Sherwen (U. York)
    Reference: Wang, X., D.J. Jacob, W. Downs, S. Zhai, L. Zhu, V. Shah, C.D. Holmes, T. Sherwen, B. Alexander, M.J. Evans, S.D. Eastham, J.A. Neuman, P. Veres, T.K Koenig, R. Volkamer, L.G. Huey, T.J. Bannan, C.J. Percival, B.H. Lee, and J.A. Thornton, Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants,  Atmos. Chem. Phys., 21, 13973-13996, 2021.
  • (12.9.0) New calculation of cloudwater pH. Developer: Viral Shah (Harvard)
    Reference: Shah, V., D.J. Jacob, J.M. Moch, X. Wang, and S. Zhai, Global modeling of cloudwater acidity, rainwater acidity, and acid inputs to ecosystems, Atmos. Chem. Phys. Discuss.,, 2020.
  • (12.9.0) Updated lightning climatology to the end of 2019. Developer: Lee Murray (U. Rochester)
    Reference: Lee Murray's lightning data site
  • (12.8.0) New isoprene chemistry mechanism and updated wet deposition of secondary organics Developer: Kelvin Bates (Harvard)
    References: (1) Bates, K.H., and D.J. Jacob, A new model mechanism for atmospheric oxidation of isoprene: global effects on oxidants, nitrogen oxides, organic products, and secondary organic aerosol, Atmos. Chem. Phys., 19, 9613-9640, 2019. (2) Safieddine, S.A., and C.L. Heald, A global assessment of dissolved organic carbon in precipitation, Geophys. Res. Lett., 44, 11,672-11,681, 2017.
  • (12.8.0) Ozone deposition to ocean Developer: Ryan Pound (U. York)
    Reference: Pound, R.J., T. Sherwen, D. Helmig, L.J. Carpenter, and M.J. Evans, Influences of oceanic ozone deposition on tropospheric photochemistry, Atmos. Chem. Phys., 20, 4227-4239, 2020.
  • (12.7.0) Updated wet deposition (option). Developers: Gan Luo and Fangqun Yu (SUNY Albany)
    Reference: G. Luo, F. Yu, J. Schwab, Revised treatment of wet scavenging processes dramatically improves GEOS-Chem 12.0.0 simulations of nitric acid, nitrate, and ammonium over the United States, Geosci. Model Dev., 12, 3439-3447, 2019.
  • (12.7.0) Methyl, ethyl, and propyl nitrate chemistry. Developer: Jenny Fisher (U. Wollongong)
    Reference: Fisher, J.A., E.L. Atlas, B. Barletta, S. Meinardi, D.R. Blake, C.R. Thompson, T.B. Ryerson, J. Peischl, Z.A. Tzompa-Sosa, and L.T. Murray, Methyl, Ethyl, and Propyl Nitrates: Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments, J. Geophys. Res., 123, 12,429-12,451, 2018.
  • (12.7.0) Methanol as part of the standard GEOS-Chem chemical mechanism. Developers: Xin Chen and Dylan Millet (U. Minnesota), Katie Travis (NASA Langley)
    Reference: Chen, X., Millet, D. B., Singh, H. B., Wisthaler, A., Apel, E. C., Atlas, E. L., Blake, D. R., Bourgeois, I., Brown, S. S., Crounse, J. D., de Gouw, J. A., Flocke, F. M., Fried, A., Heikes, B. G., Hornbrook, R. S., Mikoviny, T., Min, K.-E., Müller, M., Neuman, J. A., O'Sullivan, D. W., Peischl, J., Pfister, G. G., Richter, D., Roberts, J. M., Ryerson, T. B., Shertz, S. R., Thompson, C. R., Treadaway, V., Veres, P. R., Walega, J., Warneke, C., Washenfelder, R. A., Weibring, P., and Yuan, B.: On the sources and sinks of atmospheric VOCs: an integrated analysis of recent aircraft campaigns over North America, Atmos. Chem. Phys., 19, 9097-9123,, 2019.
  • (12.7.0) MeMo v1.0 soil sink of methane. Implementer: Melissa Sulprizio (Harvard)
    Reference: Murguia-Flores, F., Arndt, S., Ganesan, A. L., Murray-Tortarolo, G., and Hornibrook, E. R. C.: Soil Methanotrophy Model (MeMo v1.0): a process-based model to quantify global uptake of atmospheric methane by soil, Geosci. Model Dev., 11, 2009-2032,, 2018.
  • (12.6.0) Update of APM aerosol microphysics to current model version. Developers: Gan Luo and Fangqun Yu (SUNY Albany)
  • (12.6.0) Diagnosing surface ozone and HNO3 concentrations below lowest model gridpoint. Developer: Katherine Travis (NASA Langley)
  • (12.6.0) BB4CMIP historical biomass burning emissions for 1750-2014. Developer: Pengfei Liu (Harvard)
  • (12.6.0) Aerosol nitrate photolysis (optional). Developer: Prasad Kasibhatla (Duke)
  • (12.6.0) Dependence of stomatal conductance on CO2 (optional). Developer: Amos Tai (Chinese U. Hong Kong)
  • (12.6.0) New aerosol hygroscopicity tables for chemistry and photolysis. Developer: Robyn Latimer (Dalhousie)
  • (12.6.0) HNO3 dry deposition at cold temperatures. Developer: Lyatt Jaegle (U. Washington)
  • (12.6.0) Updated treatment of heterogeneous NO2, NO3, and N2O5 chemistry in aerosols and clouds. Developers: Christopher Holmes (Florida State U.), Erin McDuffie (Dalhousie)
  • (12.5.0) Updated AeroCom volcanic emissions for 1978-2019. Developer: Christoph A. Keller (NASA/GSFC)

Older developments

  • (12.4.0) Off-line emissions for dust, lightning, biogenic VOCs, soil NOx, sea salt aerosol. Developers: Chi Li (Dalhousie) for overall development; David Ridley (MIT) and Jun Meng (Dalhousie) for dust; Lee Murray (U. Rochester) for lightning; Jintai Lin and Hongjian Meng (PKU) for biogenic VOCs, soil NOx, and sea salt aerosol.
    Reference: Weng, H.-J., Lin, J.-T. *, Martin, R., Millet, D. B., Jaeglé, L., Ridley, D., Keller, C., Li, C., Du, M.-X., and Meng, J.: Global high-resolution emissions of soil NOx, sea salt aerosols, and biogenic volatile organic compounds, Scientific Data, 7, 148, doi:10.1038/s41597-020-0488-5, 2020.
  • (12.4.0) FlexGrid capability for users to select custom nested domains at run time. Developers: Melissa Sulprizio and Jiawei Zhuang (Harvard), Jintai Lin (Peking U.). See FlexGrid wiki page.
  • (12.3.0) Updated ISORROPIA from version 2.0 to version 2.2. Developer: Sebastian Eastham (MIT)
  • (12.2.1) TOMAS updates. Developers: Emily Ramnarine and Jeff Pierce (CSU), Betty Croft (Dalhousie). See TOMAS in GEOS-Chem wiki page.
  • (12.2.0) GFAS biomass burning emissions. Developers: Killian Murphy and Mathew Evans (U. York). See GFAS in GEOS-Chem wiki page.
  • (12.2.0) Obspack diagnostics package. Developers: Andrew Jacobson (NOAA) and Robert Yantosca (Harvard) See Model diagnostics wiki page.
  • (12.1.0) Budget diagnostics. Developers: Christopher Holmes (FSU) and Elizabeth Lundgren (Harvard). See Model diagnostics wiki page.
  • (12.1.0) Anthropogenic dust emissions. Developer: Sajeev Philip (Dalhousie). Reference: Philip, S., R.V. Martin, G. Snider, C. Weagle, A. van Donkelaar, M. Brauer, D. Henze, Z. Klimont, C. Venkataraman, S. Guttikunda, and Q. Zhang, Anthropogenic fugitive, combustion and industrial dust is a significant, underrepresented fine particulate matter source in global atmospheric models, Environ. Res. Lett., 12, 044018, 2017.
  • (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.,, 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.

  • (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: Tomas 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.
  • (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).

  • (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.