Chaim I. Garfinkel
Publications

  • Garfinkel, C. I., M. M. Hurwitz, L. D. Oman, D. W. Waugh (in press), Contrasting Effects of Central Pacific and Eastern Pacific El Nino on Stratospheric Water Vapor, GRL.
  • Garfinkel, C. I., L. D. Oman, E. A. Barnes, D. W. Waugh, M. M. Hurwitz, A. M. Molod (in press), Connections between the Spring Breakup of the Southern Hemisphere Polar Vortex, Stationary Waves, and Air-Sea Roughness, J. Atmos. Sci.

    @Article{ GOetal13,
    AUTHOR = {Garfinkel, C.I. and L. D. Oman and E. A. Barnes and D. W. Waugh and M. M. Hurwitz and A M. Molod},
    YEAR = {2013},
    TITLE = { Connections between the Spring Breakup of the Southern Hemisphere Polar Vortex, Stationary Waves, and Air-Sea Roughness},
    JOURNAL = JAS,
    volume = {accepted},
    doi ={},
    summary = {An updated air-sea roughness parameterization in GEOSCCM leads to a decrease in model biases in Southern Hemispheric ozone, polar cap temperature, stationary wave heat flux, and springtime vortex breakup. A dynamical mechanism is proposed whereby an improved parametrization of drag at the air-sea interface leads to improved stationary waves. Increased surface friction leads to anomalous eddy momentum flux convergence primarily in the Indian Ocean sector (where eddies are strongest climatologically) in September and October. The localization of the eddy momentum flux convergence anomaly in the Indian Ocean sector leads to a zonally asymmetric reduction in zonal wind and, by geostrophy, to a wavenumber-1 stationary wave pattern. This tropospheric stationary wave pattern leads to enhanced heat flux entering the stratosphere. The net effect is an improved Southern Hemisphere vortex: the vortex breaks up earlier in spring (i.e., the spring late-breakup bias is partially ameliorated) yet is no weaker in mid-winter. As many other chemistry-climate models use a similar scheme for their surface layer momentum drag and have similar biases in the stratosphere, we expect that results from GEOSCCM may be relevant for other climate models.}, } }

  • Garfinkel, C. I., D. W. Waugh, E. P. Gerber (2013), The Effect of Tropospheric Jet Latitude on Coupling between the Stratospheric Polar Vortex and the Troposphere, J. Clim., 26, 2077-2095, doi: 10.1175/JCLI-D-12-00301.1.

    @Article{GWetal12,
    AUTHOR = {Garfinkel, C.I. and D. W. Waugh and E.P. Gerber},
    YEAR = {2013},
    TITLE = {Effect of Tropospheric Jet Latitude on Coupling between the Stratospheric Polar Vortex and the Troposphere},
    JOURNAL = JC,
    doi = {10.1175/JCLI-D-12-00301.1},
    volume = {26},
    summary = {The tropospheric response to an identical stratospheric vortex configuration is shown to be strongest for a jet centered near 40S and weaker for jets near either 30S or 50S by more than a factor of three. Stratosphere-focused mechanisms based on eddy phase speed, eddy heat flux, stratospheric potential vorticity inversion, planetary wave reflection, and zonal length scale, appear to be incapable of explaining the differences in the magnitude of the jet shift. In contrast, arguments based purely on tropospheric dynamics involving the strength of eddy-zonal mean flow feedbacks and jet persistence, and related changes in the synoptic eddy momentum flux, appear to explain this effect. The dependence of coupling between the stratospheric polar vortex and the troposphere on tropospheric jet latitude is generally consistent with the variability and trends in jets in the North Atlantic, North Pacific, and Southern Hemisphere in observations and comprehensive models. }, }

    2012

    2011

    2010

    pre-2010

    My Ph.D. dissertation: Stratosphere-Troposphere Coupled Variability in the Wintertime Northern Hemisphere.

     

     

  • Publications

    Submitted/In Press

    • Garfinkel, C.I., D. W. Waugh, L.D. Oman, L. Wang, and M.M. Hurwitz, (submitted to J. Geophys. Res.). Temperature trends in the tropical upper troposphere and lower stratosphere: connections with sea surface temperatures and implications for water vapor and ozone.

    2013

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