Now showing items 1-20 of 95

    • Abrupt Climate Shifts in Greenland Due to Displacements of the Sea Ice Edge 

      Li, Camille; Battisti, David S.; Schrag, Daniel P.; Tziperman, Eli (American Geophysical Union, 2005)
      An atmospheric circulation model is used to show that a reduction in sea ice extent in the North Atlantic produces a climatic response consistent with abrupt changes in temperature and snow accumulation recorded in Greenland ...
    • Are the 41kyr Glacial Oscillations a Linear Response to Milankovitch Forcing? 

      Ashkenazy, Yosef; Tziperman, Eli (Elsevier, 2004)
      The characteristics of glacial oscillations changed drastically ~0.8Ma ago, at the ‘‘mid-Pleistocene transition’’. During the past 0.8Ma the ~100 kyr glacial–interglacial oscillations were strongly asymmetric (i.e., long ...
    • Asymmetry of Daily Temperature Records 

      Ashkenazy, Yosef; Feliks, Yizhak; Gildor, Hezi; Tziperman, Eli (American Meteorological Society, 2008)
      The authors study the NCEP–NCAR reanalysis temperature records and find that surface daily mean temperature cools rapidly and warms gradually at the midlatitudes (around 40°N and 40°S). This “asymmetry” is partially related ...
    • Atmospheric Superrotation in Warm Earth Climates 

      Arnold, Nathan Patrick (2014-02-25)
      This thesis considers atmospheric superrotation, a state of westerly equatorial winds which must be maintained by up-gradient eddy momentum fluxes. Superrotation has appeared in simulations of warm climates that generate ...
    • An Atmospheric Teleconnection Linking ENSO and Southwestern European Precipitation 

      Shaman, Jeffrey; Tziperman, Eli (American Meteorological Society, 2011)
      Numerous studies have demonstrated statistical associations between the El Niño–Southern Oscillation (ENSO) and precipitation in the Mediterranean basin. The dynamical bases for these teleconnections have yet to be fully ...
    • Biologically Induced Initiation of Neoproterozoic Snowball-Earth Events 

      Tziperman, Eli; Halevy, Itay; Johnston, David T; Knoll, Andrew Herbert; Schrag, Daniel P. (Proceedings of the National Academy of Sciences, 2011)
      The glaciations of the Neoproterozoic Era (1,000 to 542 MyBP) were preceded by dramatically light C isotopic excursions preserved in preglacial deposits. Standard explanations of these excursions involve remineralization ...
    • Calculating the Time-Mean Oceanic General Circulation and Mixing Coefficients from Hydrographic Data 

      Tziperman, Eli (American Meteorological Society, 1988)
      The relation between the circulation calculated from averaged hydrographic data (such as the Levitus data), and the actual time average circulation is examined using a CTD dataset which provides both time and space coverage ...
    • Can a Convective Cloud Feedback Help to Eliminate Winter Sea Ice at High CO2 Concentrations? 

      Abbot, Dorian S.; Walker, Christopher; Tziperman, Eli (American Meteorological Society, 2009)
      Winter sea ice dramatically cools the Arctic climate during the coldest months of the year and may have remote effects on global climate as well. Accurate forecasting of winter sea ice has significant social and economic ...
    • Circulation in the Eastern Levantine Basin Determined by Inverse Methods 

      Tziperman, Eli; Hecht, Artur (American Meteorological Society, 1988)
      A finite difference linear inverse model is applied to hydrographic data from six summer and fall cruises in a small area (250 × 200 km) of the eastern Mediterranean sea. The temperature and salinity equations are used to ...
    • The Climatological Seasonal Circulation of the Mediterranean Sea 

      Tziperman, Eli; Malanotte-Rizzoli, Paola (Sears Foundation for Marine Research, 1991)
      The horizontal circulation of the upper 800 m of the Mediterranean Sea is calculated from a seasonal climatological hydrographic data set using a simple inverse model. The results show a fairly steady surface circulation ...
    • Coherent Resonant Millennial-Scale Climate Oscillations Triggered by Massive Meltwater Pulses 

      Timmermann, Axel; Gildor, Hezi; Michael, Schulz; Tziperman, Eli (American Meteorological Society, 2003)
      The role of mean and stochastic freshwater forcing on the generation of millennial-scale climate variability in the North Atlantic is studied using a low-order coupled atmosphere–ocean–sea ice model. It is shown that ...
    • Computing the Steady Oceanic Circulation Using an Optimization Approach 

      Tziperman, Eli; Thacker, William C.; Bryan, Kirk (Elsevier, 1992)
      The traditional method for computing the steady oceanic circulation has been by stepping an oceanic model forward in time until transients are damped by friction. An alternative method, which has the potential for being ...
    • Consequences of Pacing the Pleistocene 100 kyr Ice Ages by Nonlinear Phase Locking to Milankovitch Forcing 

      Tziperman, Eli; Raymo, Maureen E.; Huybers, Peter John; Wunsch, Carl (American Geophysical Union, 2006)
      The consequences of the hypothesis that Milankovitch forcing affects the phase (e.g., termination times) of the 100 kyr glacial cycles via a mechanism known as “nonlinear phase locking” are examined. Phase locking provides ...
    • Controlling Spatiotemporal Chaos in a Realistic El Niño Prediction Model 

      Tziperman, Eli; Scher, Harvey; Zebiak, Stephen E.; Cane, Mark A. (American Physical Society, 1997)
      A method for controlling low-order chaotic behavior of continuous spatiotemporal systems is developed and demonstrated in a complex, realistic 3D partial differential equation model that is used successfully for predicting ...
    • Controls on the Activation and Strength of a High-Latitude Convective Cloud Feedback 

      Abbot, Dorian; Tziperman, Eli (American Meteorological Society, 2009)
      Previous work has shown that a convective cloud feedback can greatly increase high-latitude surface temperature upon the removal of sea ice and can keep sea ice from forming throughout polar night. This feedback activates ...
    • Convection from a Source in an Ocean Basin 

      Speer, Kevin; Tziperman, Eli (Elsevier, 1990)
      A model is presented for the deep interior stratification and upwelling in an ocean basin connected to a marginal sea. Three elements make up the model: a marginal sea, a turbulent boundary current and an interior region. ...
    • Dynamics of a Snowball Earth Ocean 

      Ashkenazy, Yosef; Gildor, Hezi; Losch, Martin; Macdonald, Francis Alexander; Schrag, Daniel P.; Tziperman, Eli (Nature Publishing Group, 2013)
      Geological evidence suggests that marine ice extended to the Equator at least twice during the Neoproterozoic era (about 750 to 635 million years ago), inspiring the Snowball Earth hypothesis that the Earth was globally ...
    • Dynamics of ice stream temporal variability: Modes, scales, and hysteresis 

      Robel, Alexander Abram; DeGiuli, E.; Schoof, C.; Tziperman, Eli (Wiley-Blackwell, 2013)
      Understanding the mechanisms governing temporal variability of ice stream flow remains one of the major barriers to developing accurate models of ice sheet dynamics and ice‒climate interactions. Here we analyze a simple ...
    • The Effect of ENSO on Tibetan Plateau Snow Depth: A Stationary Wave Teleconnection Mechanism and Implications for the South Asian Monsoons 

      Shaman, Jeffrey; Tziperman, Eli (American Meteorological Society, 2005)
      An atmospheric stationary wave teleconnection mechanism is proposed to explain how ENSO may affect the Tibetan Plateau snow depth and thereby the south Asian monsoons. Using statistical analysis, the short available record ...
    • The Effect of Milankovitch Variations in Insolation on Equatorial Seasonality 

      Ashkenazy, Yosef; Eisenman, Ian; Gildor, Hezi; Tziperman, Eli (American Meteorological Society, 2010)
      Although the sun crosses the equator 2 times per year at the equinoxes, at times in the past the equatorial insolation has had only one maximum and one minimum throughout the seasonal cycle because of Milankovitch orbital ...