< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> Atmospheric Chemistry Modeling Group, Harvard University

CURRENT RESEARCH PROJECTS

Last Updated: May 8, 2018

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Our research focuses on better understanding the chemical composition of the atmosphere, its perturbation by human activity, and the implications for life on Earth. We use advanced global models of atmospheric composition to interpret observations from satellites, aircraft, ground networks, and other platforms. We view our models as part of an integrated observing system bridging the information from different data sets to increase fundamental knowledge and address pressing environmental issues.

GLOBAL MODELS. A central tool in our research is the GEOS-Chem global 3-D model of atmospheric composition, developed by a large grass-roots research community at Harvard and elsewhere. See the GEOS-Chem web site for more details. We apply the model to a wide range of atmospheric chemistry problems and lead its development on both scientific and software engingeering fronts. GEOS-Chem provides a cutting-edge tool for modeling atmospheric composition and at the same time a powerful chemical module for Earth System Models to be used in study of chemistry-climate interactions and for chemical data assimilation.

AIRCRAFT MISSIONS. Aircraft enable detailed chemical characterization of atmospheric composition from the surface to the stratosphere. We have been involved over the years in many aircraft missions in different regions of the world. Our roles include mission design, flight planning, near-real-time model simulations, and post-mission data analysis. We use the GEOS-Chem model to integrate and interpret observations taken from different instruments and from different platforms.

SATELLITE OBSERVATIONS. Satellites are revolutionizing atmospheric chemistry research by providing global continuous data to inform emission inventories, air quality, climate forcing, and other issues. The data require advanced models for interpretation and we lead the development and application of these models. Our activities include retrievals of satellite spectra using radiative transfer models, inverse model analyses, chemical data assimilation, and Observing System Simulation Experiments (OSSEs) for future satellite missions.

model ITCT satellite

CURRENT PROJECTS

Air quality | Methane | Chemistry-climate interactions | Global atmospheric chemistry | Model development

AIR QUALITY METHANE CHEMISTRY-CLIMATE INTERACTIONS
  • See Loretta Mickley's research page. Students/postdocs working on chemistry/climate interactions projects generally have Loretta Mickley as primary research advisor.

GLOBAL ATMOSPHERIC CHEMISTRY MODEL DEVELOPMENT

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Project Descriptions



nigeria TROPOSPHERIC OXIDANTS

BACKGROUND:

Tropospheric oxidants (ozone and OH) are of central importance for global atmospheric chemistry. The hydroxyl radical (OH) is the main atmospheric oxidant responsible for removal of atmospheric gases, yet we have little understanding of its variability. Ozone is a major greenhouse gas in the middle/upper troposphere and a toxic gas at the surface. Chemical production and loss of ozone and OH involve complex nonlinear mechanisms with nitrogen oxides (NOx) as critical precursors and strong coupling to transport. Better understanding this chemistry holds the key to quantifying human influence.

OBJECTIVES:

  • Better understand the sources and chemistry of nitrogen oxides;
  • Develop a new method for monitoring global OH;
  • Better understand nonlinearity in oxidant chemistry and its coupling to transport.

APPROACH:

  • Interpret aircraft and satellite observations of nitrogen oxides in the upper troposphere to better understand sources and chemistry;
  • Conduct observing system simulation experiments (OSSEs) to determine the potential for satellite observations to quantify OH concentrations and its trends;
  • Conduct very high resolution simulations of tropospheric chemistry to investigate nonlinearities.

PEOPLE: Rachel Silvern, , Yuzhong Zhang, Eloise Marais (now at U. Birmingham), Lu Hu (now at U. Montana)

COLLABORATORS: Christoph Keller (NASA GSFC), John Worden (JPL)

REFERENCES:

  • Hu, L., C.A. Keller, M.S. Long, T. Sherwen, B. Auer, A. Da Silva, J.E. Nielsen, S. Pawson, M.A. Thompson, A.L. Trayanov, K.R. Travis, S.K. Grange, M.J. Evans, and D.J. Jacob, Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module within the NASA GEOS Earth System Model, submitted to Geosci. Model Dev., 2018. [PDF]

  • Silvern, R.F., D.J. Jacob, K.R. Travis, T. Sherwen, M.J. Evans, R.C. Cohen, J.L. Laughner, S.R. Hall, K. Ullmann, J.D. Crounse, P.O. Wennberg, J. Peischl, and I.B. Pollack, Observed NO-NO2 ratios in the upper troposphere imply errors in NO-NO2-O3 cycling kinetics or an unaccounted NOx reservoir,, Geophys. Res. Lett., in press, 2018. [PDF]

SUPPORT: NASA ACMAP, NASA IDS

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nigeria TROPOSPHERIC HALOGEN CHEMISTRY

BACKGROUND:

Atmospheric observations indicate high concentrations of halogen radicals (Cl, Br, I) in the troposphere, resulting in oxidant chains and catalytic cycles that have important implications for the global budgets of the main tropospheric oxidants (ozone and OH), the oxidation of mercury, and other processes. Halogen chemistry has in general not been included in global models of tropospheric chemistry because the underlying processes are not well understood. This situation is rapidly changing.

OBJECTIVES:

  • Develop a comprehensive understanding of stratospheric-tropospheric Cl-Br-I chemistry for implementation in global models;
  • Examine the implications for global tropospheric oxidant chemistry.

APPROACH:

  • Implement a comprehensive representation of halogen chemistry in the GEOS-Chem global model;
  • Evaluate it with observations for halogen radicals and their reservoirs;
  • Quantify the effects on tropospheric ozone, OH, and related species, and the consistency with atmospheric observations of these species.

PEOPLE: Lei Zhu, Xuan Wang

COLLABORATORS: Sebastian Eastham (MIT), Mat Evans and Tomas Sherwen (U. York)

REFERENCES:

  • Schmidt, J.A., D.J. Jacob, H.M. Horowitz, L. Hu, T. Sherwen, M.J. Evans, Q. Liang, R.M. Suleiman, D.E. Oram, M. LeBreton, C.J. Percival, S. Wang, B. Dix, and R. Volkamer, Modeling the tropospheric BrO background: importance of multiphase chemistry and implications for ozone, OH, and mercury, J. Geophys. Res., 121, 11819-11835, 2016. [PDF]

SUPPORT: National Science Foundation, JLAQC

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fires AIR QUALITY IN CHINA

BACKGROUND:

Air quality in China is among the worst in the world and there is strong public pressure to improve it. Newly installed surface air quality networks together with satellite observations can lead to a better understanding of air quality problems, better choices for emission control strategies, and understanding of the effects of future climate change.

OBJECTIVES:

  • Understand the effects of anthropogenic emissions and meteorological variability in determining ozone and particulate matter (PM) air quality in China;
  • Project the effects of future climate change.

APPROACH:

  • Interpret interannual variability and trends in satellite observations of ozone, formaldehyde, and NO2 over China;
  • Analyze and model surface network data for ozone and PM to determine the dominant sources and the expected responses to emission controls;
  • Use observed relationships of air quality and meteorological variables, and extreme value theory, to project the effects of climate change on Beijing air quality.

PEOPLE:Ke Li, Lu Shen, Xuan Wang, Jonathan Moch, Shixian Zhai, Drew Pendergrass

REFERENCES:

  • Shen, L., D.J. Jacob, L.J. Mickley, Y. Wang, and Q. Zhang, Uncertain effect of climate change on winter haze pollution in Beijing , submitted to Nature Comm., 2018.

  • Making sense of air quality, presented by Daniel Jacob at the PKU-Harvard Summer School on Climate, Weather, Pollution, and Health Consequences, Beijing, August 2, 2017. [[PDF]

SUPPORT: Harvard Global Institute, JLAQC

COLLABORATORS:Hong Liao (NUIST)

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PRB AIR QUALITY IN THE UNITED STATES

BACKGROUND:

Air quality in the US has been steadily improving but surface concentrations of ozone and particulate matter (PM) still exceed air quality standards. Emission control strategies that have been successful in the past may not be as successful in the future as chemical regimes change and as natural emissions and international transport of pollution become more important. We need to better understand what controls ozone and PM in the present day and the implications for meeting the standards. There is also increasing interest in formaldehyde as a carcinogenous air pollutant.

OBJECTIVES:

  • Better understand the factors controlling surface ozone in the eastern US;
  • Better understand the factors controlling organic and sulfate PM, and their trends;
  • Better understand biogenic isoprene chemistry and its role for production ozone, PM, and formaldehyde;
  • Develop a capability for monitoring US air quality from space.

APPROACH:

  • Use a high-resolution version of the GEOS-Chem model to interpret air quality observations in the eastern US from surface networks and aircraft;
  • Use advanced inverse methods to infer biogenic isoprene emission from satellite observations of formaldehyde;
  • Improve the value of satellite NO2 observations as constraints on NOx emissions.

PEOPLE: Jennifer Kaiser, Rachel Silvern, Katherine Travis (now at MIT)

REFERENCES:

  • Kaiser, J., D.J. Jacob, L. Zhu, K.R. Travis, J.A. Fisher, G. González Abad, L. Zhang, X. Zhang, A. Fried, J.D. Crounse, J.M. St. Clair, and A. Wisthaler, High-resolution inversion of OMI formaldehyde columns to quantify isoprene emission on ecosystem-relevant scales: application to the Southeast US, Atmos. Chem. Phys., 18, 5483-5497, 2018. [PDF]

  • Silvern, R.F., D.J. Jacob, K.R. Travis, T. Sherwen, M.J. Evans, R.C. Cohen, J.L. Laughner, S.R. Hall, K. Ullmann, J.D. Crounse, P.O. Wennberg, J. Peischl, and I.B. Pollack, Observed NO-NO2 ratios in the upper troposphere imply errors in NO-NO2-O3 cycling kinetics or an unaccounted NOx reservoir,, Geophys. Res. Lett., in press, 2018. [PDF]

SUPPORT: NASA ACCDAM, NASA Aura, EPA

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PRB ORGANIC CHEMISTRY

BACKGROUND:

The atmospheric chemistry of volatile organic compounds (VOCs) has major implications for oxidant concentrations and for formation of organic aerosol. VOCs are emitted from a range of biogenic and anthropogenic sources. They undergo various oxidation cascades in the atmosphere, producing increasingly substituted and cleaved compounds, terminating eventually in the formation of CO2 or the removal by deposition. Most of the species and reactions involved have never been measured and must be inferred indirectly. Multigenerational products of VOC oxidation may be responsible for an "organic soup" in the remote troposphere that is suggested by observations but not understood at all. Representing organic chemistry in models is a major challenge.

OBJECTIVES:

  • Understand fully the chemical mechanism for isoprene oxidation and its implications for ozone, OH, aerosols;
  • Improve understanding of the budgets of oxygenated organics;
  • Better understand the budgets of formaldehyde and glyoxal as satellite proxies of VOC oxidation.

APPROACH:

  • Develop VOC oxidation mechanisms from first principles and test them in box models and in GEOS-Chem;
  • Interpret observations of oxygenated organics in the remote troposphere from the ATom aircraft campaign;
  • Interpret satellite observations of formaldehyde and glyoxal.

PEOPLE: Jennifer Kaiser, Kelvin Bates

REFERENCES:

  • Kaiser, J., D.J. Jacob, L. Zhu, K.R. Travis, J.A. Fisher, G. González Abad, L. Zhang, X. Zhang, A. Fried, J.D. Crounse, J.M. St. Clair, and A. Wisthaler, High-resolution inversion of OMI formaldehyde columns to quantify isoprene emission on ecosystem-relevant scales: application to the Southeast US, Atmos. Chem. Phys., 18, 5483-5497, 2018. [PDF]

SUPPORT: NASA ACMAP, HUCE

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PRB MERCURY CHEMISTRY

BACKGROUND:

Mercury deposition to ecosystems results in accumulation of toxic forms of mercury up the food chain. Mercury is emitted to the atmosphere mostly as Hg(0), and is oxidized in the atmosphere to Hg(II) which can be rapidly deposited but also reduced back to Hg(0). Understanding atmospheric Hg(0)/Hg(II) redox chemistry is therefore crucial to predicting the patterns of mercury deposition and the subsequent biogeochemical cycling.

OBJECTIVES:

  • Better understand the atmospheric redox chemistry of mercury;
  • Determine the implications for mercury deposition to ecosystems and subsequent biogeochemical cycling.

APPROACH:

  • Simulations of detailed mercury chemistry in the GEOS-Chem atmospheric model coupled to ocean and terrestrial mercury reservoirs;
  • Use this model to interpret global atmospheric observations of mercury.

PEOPLE: Colin Thackray

COLLABORATORS: Elsie Sunderland (Harvard), Alfonso Saiz-Lopez (CSIC)

REFERENCES:

  • Saiz-Lopez, A., S.P. Sitkiewicz, D. Roca-Sanjuan, J.M. Oliva-Enrich, J.Z. Davalos, R. Notario, M. Jiskra, Y. Xu, F. Wang, C.P. Thackray, E.M. Sunderland, D.J. Jacob, O. Tratnikov, C.A. Cuevas, A.U. Acuna, D. Rivero, J.M.C. Plane, D.E. Kinnison, and J.E. Sonke, Atmospheric photoreduction of gaseous oxidized mercury requires a rethink of the global mercury cycle submitted to Nature, 2018.

SUPPORT: NSF

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CH4 METHANE EMISSION INVENTORIES

BACKGROUND:

Methane is the second most important anthropogenic greenhouse gas after CO2. It is particularly important for near-term (~20 years) climate change. Methane is emitted by a wide range of processes including oil/gas systems, livestock, landfills, wastewater, rice cultivation, and wetlands. The magnitudes of these sources, their spatial distributions, and their temporal trends are poorly understood. Improving methane emission inventories is imperative for climate policy.

OBJECTIVES:

  • Develop a high-resolution global methane emission inventory from the oil and gas industry;
  • Develop global methane emission inventories from aquatic systems including hydroelectric and other reservoirs, and coastal environments including estuaries;
  • Construct gridded policy-relevant anthropogenic emission inventories for Canada and Mexico to be evaluated with atmospheric observations.

APPROACH:

  • Estimate emissions and their distributions using best available data for activities and emission factors;
  • Use ancillary data as from satellites to inform the distribution of emissions;
  • Work with climate agencies in Canada and Mexico to construct gridded versions of their national inventories.

PEOPLE:   Bram Maasakkers, Jianxiong Sheng, Tia Scarpelli, Melissa Sulprizio, Yuzhong Zhang

COLLABORATORS: Ritesh Gautam (EDF), Elsie Sunderland (Harvard)

REFERENCES:

  • Sheng, J.-X., D. J. Jacob, J.D. Maasakkers, M.P. Sulprizio, D. Zavala-Areiza, and S. Hamburg, A high-resolution (0.1ox0.1o) inventory of methane emissions from Canadian and Mexican oil and gas systems, Atmos. Environ., 158, 211-215, 2017. [PDF]

  • Maasakkers, J.D., D.J.Jacob, M.P. Sulprizio, A.J. Turner, M. Weitz, T. Wirth, C. Hight, M. DeFigueiredo, M. Desai, R. Schmeltz, L. Hockstad, A.A. Bloom, K.W. Bowman, S. Jeong, and M.L. Fischer, Gridded national inventory of U.S. methane emissions, Environ. Sci. Technol., 50, 13123−13133, 2016. [PDF]

SUPPORT: NASA CMS, NASA IDS, Harvard Climate Initiative, DOD NDSEG Fellowship to TRS

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CH4 INFERRING GLOBAL METHANE EMISSIONS FROM ATMOSPHERIC OBSERVATIONS

BACKGROUND:

Observations of atmospheric methane can test emission inventories and diagnose emission trends. This involves statistical inversion of chemical transport models that relate emissions to concentrations. Satellites are now providing global continuous observations of methane that deliver powerful constraints on methane emissions worldwide. This information can be exploited to improve national emission inventories reported in international climate policy agreements and to identify targets for reducing methane emissions. The TROPOMI instrument launched in October 2017 promises to revolutionize our ability to map methane emissions from space by provding daily global coverage of methane concentrations.

OBJECTIVES:

  • Infer global methane emissions and trends using satellite observations;
  • Use aircraft observations to constrain methane emissions on regional scales.

APPROACH:

  • Use GOSAT satellite observations for 2009-present to constrain methane emissions, their trends, and OH concentrations (the main methane sink);
  • Use results for the US to improve the national emission inventory compiled by EPA;
  • Use the long-term satellite record from SCIAMACHY (2003-2012), GOSAT (2009-), and TROPOMI (2018-) to understand current trends in atmospheric methane and attribute them to changes in different source types and in OH concentrations (the main methane sink).

PEOPLE: Bram Maasakkers, Jianxiong Sheng, Melissa Sulprizio, Yuzhong Zhang, Hannah Nesser)

COLLABORATORS: Melissa Weitz (EPA), Tom Wirth (EPA), Anthony Bloom (JPL), John Worden (JPL), Ilse Aben (SRON)

REFERENCES:

  • Sheng, J.-X., D.J. Jacob, J.D. Maasakkers, Y. Zhang, and M.P. Sulprizio, Potential of low-Earth orbit (TROPOMI) and geostationary (GeoCARB, GEO-CAPE) satellite instruments for constraining methane emissions on fine regional scales: application to the Southeast US , submitted to Atmos. Meas. Tech., 2018. [PDF].

  • Sheng, J.-X., D.J. Jacob, A.J. Turner, J.D. Maasakkers, M.P. Sulprizio, A.A. Bloom, A.E. Andrews, and D. Wunch, High-resolution inversion of methane emissions in the Southeast US using SEAC4RS aircraft observations of atmospheric methane: anthropogenic and wetland sources, Atmos. Chem. Phys., 18, 6483-6491, 2018. [PDF]

  • Global distribution of methane emissions, emission trends, and OH trends from an inversion of 2010-2015 GOSAT data, presented by J.D. (Bram) Maasakkers at the AGU 2017 Fall meeting, New Orleans, Dec 11-15, 2017. [PDF]

SUPPORT: NASA CMS, NASA IDS

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CH4 DETECTING METHANE POINT SOURCES FROM SPACE

BACKGROUND:

Anthropogenic emissions of methane come from a very large number of relatively small point sources including coal mine vents, oil/gas processing facilities, stockyards, landfills, etc. These sources have highly variable emissions, and can spike under abnormal conditions. Satellites provide a vantage point for continuous monitoring of these point sources and detecting emission spikes. Pixel resolution, precision, and return time can however limit the information from a satellite instrument. Quantitative interpretation of the observed turbulent plume in terms of a point emission rate is not a trivial problem.

OBJECTIVES:

  • Infer point source emissions from plume observations with the GHGSat satellite instrument;
  • Determine the ability of different satellite observing configurations to resolve the distribution of point sources;
  • Determine how one may combine satellite observations with a surface network to detect abnormal emitters.

APPROACH:

  • Conduct large-eddy simulations of point sources to test different algorithms for retrieving emission rates from plume observations;
  • Conduct observing system simulation experiments (OSSEs) to test the ability of different satellite systems to resolve the distribution of emissions in oil/gas fields;
  • Conduct OSSEs for arbitrary fields of point sources to determine the ability of different satellite and ground systems for detecting abnormal emitters.

PEOPLE: Daniel Varon, Dan Cusworth, Alex Turner (now at UC Berkeley)

COLLABORATORS: Jason McKeever (GHGSat, Inc.), Cynthia Randles, Laurent White, Jeremry Boardman (Exxon Mobil)

REFERENCES:

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    Varon, D.J., D.J. Jacob, J. McKeever, D. Jervis, B.O.A. Durak, Y. Xia, and Y. Huang, Quantifying methane point sources from fine-scale (GHGSat) satellite observations of atmospheric methane plumes , submitted to Atmos. Chem. Phys.., 2018. [PDF]

  • Capabilities of different satellite observing systems or mapping methane emissions on regional to km scales, presented by Daniel Jacob at the NASA GEO-CAPE workshop, College Park, Maryland, May , 2018. [PPT]

SUPPORT: GHGSat, Inc., Exxon Mobil, DOE ARPA-E

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ESMF GEOS-Chem AS CHEMICAL MODULE FOR EARTH SYSTEM MODELS AND MASSIVELY PARALLEL APPLICATIONS

BACKGROUND:

Earth System Models (ESMs) used for climate simulations, seasonal forecasting, and data assimilation do not include detailed atmospheric chemistry because of the perceived complexity and computational cost. Yet atmospheric chemistry is key to climate forcing and air quality forecasting, and is also needed for assimilation of chemical observations from satellites. The software architecture needed to couple chemical modules in ESMs also allows massively parallel chemical transport modeling using the Message Passing Interface (MPI) protocol. This provides the basis for the high-performance version of GEOS-Chem (GCHP).

OBJECTIVES:

  • Develop a capability for use of GEOS-Chem as chemical module in ESMs through the Earth System Modeling Framework (ESMF), using exactly the same code as in the off-line GEOS-Chem developed and supported by a large community of atmospheric chemistry users;
  • Demonstrate this capability in the NASA-Goddard Earth Observing System ESM (GEOS), the NCAR ESM (CESM), and the Beijing Climate Center (BCC) ESM;
  • Use this on-line capability for seasonal forecasting of air quality, and for joint chemical and meteorological data assimilation;
  • Develop capability for massively parallel GEOS-Chem simulations through GCHP.

APPROACH:

  • Integrate GEOS-Chem into different ESM environments;
  • Develop a capability for chemical data assimilation within the NASA GEOS data assimilation system;
  • Develop GCHP as a powerful resource for high-resolution simulations of atmospheric chemistry.

PEOPLE:   Sebastian Eastham (now at MIT), Lu Hu (now at U. Montana), Jiawei Zhuang, Ada Shaw, GEOS-Chem Support Team

COLLABORATORS: Steven Pawson (NASA/GSFC), Christoph Keller (NASA/GSFC), Lin Zhang (PKU), Xiao Lu (PKU), Randall Martin (Dalhousie), Jintai Lin (PKU)

REFERENCES:

  • 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. [PDF].

  • Hu, L., C.A. Keller, M.S. Long, T. Sherwen, B. Auer, A. Da Silva, J.E. Nielsen, S. Pawson, M.A. Thompson, A.L. Trayanov, K.R. Travis, S.K. Grange, M.J. Evans, and D.J. Jacob, Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module within the NASA GEOS Earth System Model, submitted to Geosci. Model Dev., 2018. [PDF]

SUPPORT: NASA MAP, NASA ACMAP, JLAQC

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Scale SCALE ISSUES IN GLOBAL MODELS OF ATMOSPHERIC COMPOSITION

BACKGROUND:

Atmospheric composition problems cover a wide range of spatial scales, from the dispersion of point sources to the global circulation, and a wide range of chemical scales, from radical chemistry taking place on time scales of less than a second to the accumulation of long-lived gases. Many of the more interesting problems in atmospheric composition require proper accounting of this continuum of scales and involving nonlinear coupling between chemistry and transport on all scales. Accomplishing this in a computationally tractable manner is a grand challenge in modeling atmospheric composition.

OBJECTIVES:

  • Understand the sensitivity of model results to different simulation environments including spatial resolution, on-line vs. off-line, grid structure, etc.;
  • Develop algorithms to optimize the choice of simulation environment for a particular problem.
  • Better understand the model requirements needed for global-scale transport of chemical plumes.
  • Speed up the integration of chemical kinetics (chemical solver).

APPROACH:

  • Study the role of numerical diffusion in realistic divergent atmospheric flows;
  • Use satellite observations to better understand the global-scale transport of chemical plumes;
  • Determine the model resolution needed to simulate global-scale transport of chemical plumes;
  • Test the sensitivity of GEOS-Chem simulations to different model environments including on-line vs. off-line and spatial resolution.
  • Explore numerical and machine learning methods to speed up the chemical solver..

PEOPLE: Karen Yu (now at TIVO), Sebastian Eastham (now at MIT), Jiawei Zhuang, Ada Shaw

REFERENCES:

  • Zhuang, J., D.J. Jacob, and S.D. Eastham, The importance of vertical resolution in the free troposphere for modeling intercontinental plumes, submitted to Atmos. Chem. Phys., 2017. [PDF]

  • Eastham, S.D. and D. J. Jacob, Limits on the ability of global Eulerian models to resolve intercontinental transport of chemical plumes, Atmos. Chem. Phys., 17, 2543-2553,2017. [PDF]

SUPPORT: NASA MAP

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Scale GEOS-CHEM ON THE CLOUD

BACKGROUND:

Cloud computing can allow GEOS-Chem users worldwide to run the model with no local hardware or systems support, and no installation or compilation of the code. Users can instead access the standard configuration of the model through the cloud and execute it for their application. They can also download the model and its environment from the cloud, ensuring compatibility with their local system. This has many advantages in terms of computing cost, model access, user support, reproducibility of results, and traceability of the standard model.

OBJECTIVES:

  • Develop capability to run GEOS-Chem and host its input databases on the cloud.

APPROACH:

  • Work with Amazon Web Services (AWS) and GEOS-Chem users to develop a successful business model.

PEOPLE: Jiawei Zhuang, Judit Flo-Gaya

REFERENCES:

SUPPORT: NASA ACMAP

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