151 research outputs found
Unstable radiative-dynamical interactions
No full textThesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1988.Includes bibliographical references.by Steven John Ghan.Sc.D
Modelling the synoptic scale relationship between eddy heat flux and the meridional temperature gradient
No full textThesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology and Physical Oceanography, 1981.Microfiche copy available in Archives and Science.Bibliography: leaves 63-65.by Steven John Ghan.M.S
Erratum: Challenges in constraining anthropogenic aerosol effects on cloud radiative forcing using present-day spatiotemporal variability
No full textCOLLOQUIUM Correction for “Challenges in constraining anthropogenic aerosol effects on cloud radiative forcing using present-day spatiotemporal variability,” by Steven Ghan, Minghuai Wang, Shipeng Zhang, Sylvaine Ferrachat, Andrew Gettelman, Jan Griesfeller, Zak Kipling, Ulrike Lohmann, Hugh Morrison, David Neubauer, Daniel G. Partridge, Philip Stier, Toshihiko Takemura, Hailong Wang, and Kai Zhang, which appeared in issue 21, May 24, 2016, of Proc Natl Acad Sci USA (113:5804–5811; first published February 26, 2016; 10.1073/pnas.1514036113)
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Religious Intolerance in Africa: The Islam-Christian, North-South Divide in Africa and False Gods
No full textTrans-Atlantic Roundtable on Race and Religion. Accra, Ghan
Climate Scientists as Activists
No full textThe pursuit of global political solutions to climate change is not for the faint of heart—but it is a matter of civic responsibility.</jats:p
Anthropogenic Sulfate, Clouds, and Climate Forcing
No full textThis research work is a joint effort between research groups at the Battelle Pacific Northwest Laboratory, Virginia Tech University, Georgia Institute of Technology, Brookhaven National Laboratory, and Texas A&M University. It has been jointly sponsored by the National Aeronautics and Space Administration, the U.S. Department of Energy, and the U.S. Environmental Protection Agency. In this research, a detailed tropospheric aerosol-chemistry model that predicts oxidant concentrations as well as concentrations of sulfur dioxide and sulfate aerosols has been coupled to a general circulation model that distinguishes between cloud water mass and cloud droplet number. The coupled model system has been first validated and then used to estimate the radiative impact of anthropogenic sulfur emissions. Both the direct radiative impact of the aerosols and their indirect impact through their influence on cloud droplet number are represented by distinguishing between sulfuric acid vapor and fresh and aged sulfate aerosols, and by parameterizing cloud droplet nucleation in terms of vertical velocity and the number concentration of aged sulfur aerosols. Natural sulfate aerosols, dust, and carbonaceous and nitrate aerosols and their influence on the radiative impact of anthropogenic sulfate aerosols, through competition as cloud condensation nuclei, will also be simulated. Parallel simulations with and without anthropogenic sulfur emissions are performed for a global domain. The objectives of the research are: To couple a state-of-the-art tropospheric aerosol-chemistry model with a global climate model. To use field and satellite measurements to evaluate the treatment of tropospheric chemistry and aerosol physics in the coupled model. To use the coupled model to simulate the radiative (and ultimately climatic) impacts of anthropogenic sulfur emissions
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