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Testing and Improving ENSO Models by Process Using Transfer Functions
(Wiley-Blackwell, 2010)
Some key elements of ENSO are not consistently well captured in GCMs. However, modifying the wrong parameters may lead to the right result for the wrong reason. We introduce “transfer functions” to quantify the input/ ...
The Effect of Milankovitch Variations in Insolation on Equatorial Seasonality
(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 ...
Upper-Ocean Singular Vectors of the North Atlantic Climate with Implications for Linear Predictability and Variability
(Wiley-Blackwell, 2012)
The limits of predictability of the meridional overturning circulation (MOC) and upper-ocean temperatures due to errors in ocean initial conditions and model parametrizations are investigated in an idealized configuration ...
Interaction and Variability of Ice Streams under a Triple-Valued Sliding Law and Non-Newtonian Rheology
(Wiley-Blackwell, 2011)
Ice streams are regions of fast flowing glacier ice that transport a significant portion of the total ice flux from present ice sheets. The flow pattern of ice streams can vary both temporally and spatially. In particular, ...
The Role of Ocean Dynamics in the Optimal Growth of Tropical SST Anomalies
(American Meteorological Society, 2010)
The role of ocean dynamics in optimally exciting interannual variability of tropical sea surface temperature (SST) anomalies is investigated using an idealized-geometry ocean general circulation model. Initial temperature ...
Biologically Induced Initiation of Neoproterozoic Snowball-Earth Events
(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 ...
Excitation of Intraseasonal Variability in the Equatorial Atmosphere by Yanai Wave Groups via WISHE-Induced Convection
(American Meteorological Society, 2011)
A mechanism is presented, based on multiscale interactions via nonlinear wind-induced surface heat exchange (WISHE), that produces eastward-propagating, intraseasonal convective anomalies in the tropical atmosphere. ...
Nonnormal Frontal Dynamics
(American Meteorological Society, 2010)
The generalized stability of the secondary atmospheric circulation over strong SST fronts is studied using a hydrostatic, Boussinesq, two-dimensional f-plane model. It is shown that even in a parameter regime in which these ...
An Atmospheric Teleconnection Linking ENSO and Southwestern European Precipitation
(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 ...
Optimal Excitation of Interannual Atlantic Meridional Overturning Circulation Variability
(American Meteorological Society, 2011)
The optimal excitation of Atlantic meridional overturning circulation (MOC) anomalies is investigated in an ocean general circulation model with an idealized configuration. The optimal three-dimensional spatial structure ...