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RISOn the Relationship of Barotropic Singular Modes to the Low-Frequency Variability of a General Circulation Model
Publisher: American Meteorological Society
Abstract: The hypothesis that extratropical low-frequency variability can be viewed as a linear barotropic response to spatially incoherent forcing is put to test. The recurrent ultra-low-frequency structures [i.e., the empirical ...
The Influence of Midlatitude Ocean–Atmosphere Coupling on the Low-Frequency Variability of a GCM. Part I: No Tropical SST Forcing
Publisher: American Meteorological Society
Abstract: This study examines the extent to which the thermodynamic interactions between the midlatitude atmosphere and the underlying oceanic mixed layer contribute to the low-frequency atmospheric variability. A general circulation ...
The Influence of Midlatitude Ocean–Atmosphere Coupling on the Low-Frequency Variability of a GCM. Part II: Interannual Variability Induced by Tropical SST Forcing
Publisher: American Meteorological Society
Abstract: This study extends the investigation of the impact of midlatitude ocean?atmosphere interactions on the atmospheric circulation to the interannual timescale by incorporating SST variability in the tropical Pacific representative ...
The Influence of Midlatitude Ocean–Atmosphere Coupling on the Low-Frequency Variability of a GCM. Part II: Interannual Variability Induced by Tropical SST Forcing
Publisher: American Meteorological Society
Abstract: This study extends the investigation of the impact of midlatitude ocean?atmosphere interactions on the atmospheric circulation to the interannual timescale by incorporating SST variability in the tropical Pacific representative ...
Tropical Intraseasonal Oscillations in a Simple Nonlinear Model
Publisher: American Meteorological Society
Abstract: This study examines two possible mechanisms responsible for the selection of the preferred period of the Madden and Julian (40?50 day) oscillation. A global two-level nonlinear model with a positive-only CISK-type cumulus ...
The Linear and Nonlinear Extratropical Response of the Atmosphere to Tropical Intraseasonal Heating
Publisher: American Meteorological Society
Abstract: This study examines the dynamical nature of the linear and nonlinear extratropical response of the atmosphere to tropical intraseasonal heating with various temporal and spatial structures. A global two-level model is used. ...
The Late Fall Extratropical Response to ENSO: Sensitivity to Coupling and Convection in the Tropical West Pacific
Publisher: American Meteorological Society
Abstract: The extratropical response to El Niño in late fall departs considerably from the canonical El Niño signal. Observational analysis suggests that this response is modulated by anomalous forcing in the tropical west Pacific ...
Characteristics of North American Summertime Rainfall with Emphasis on the Monsoon
Publisher: American Meteorological Society
Abstract: The core region of the North American summer monsoon is examined using spatially averaged daily rainfall observations obtained from gauges, with the objective of improving understanding of its climatology and variability. ...
The Effective Number of Spatial Degrees of Freedom of a Time-Varying Field
Publisher: American Meteorological Society
Abstract: The authors systematically investigate two easily computed measures of the effective number of spatial degrees of freedom (ESDOF), or number of independently varying spatial patterns, of a time-varying field of data. The ...
The Atmospheric Bridge: The Influence of ENSO Teleconnections on Air–Sea Interaction over the Global Oceans
Publisher: American Meteorological Society
Abstract: During El Niño?Southern Oscillation (ENSO) events, the atmospheric response to sea surface temperature (SST) anomalies in the equatorial Pacific influences ocean conditions over the remainder of the globe. This connection ...