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Baroclinic Modons as Prototypes for Atmospheric Blocking
Publisher: American Meteorological Society
Abstract: A two-layer quasi-geostrophic channel model on a ?-plane is used to investigate the properties of dipole eddies which may be relevant models for atmospheric blocking. It is shown that quasi-stationary equivalent barotropic ...
A Direct Method for Assimilating Sea Surface Height Data into Ocean Models with Adjustments to the Deep Circulation
Publisher: American Meteorological Society
Abstract: There is as yet no consensus an the best method for inserting surface data into ocean models so that appropriate information is transmitted to the deeper layers in a rapid and efficient manner. First we consider the ...
Weather Regimes in the Pacific from a GCM
Publisher: American Meteorological Society
Abstract: Weather regimes have been sought by examining the 500-mb streamfunction of the UGAMP GCM run for 10 yr at T42 resolution with perpetual January forcing. Five-day low-pass EOFs provide a low-order phase space in which to ...
Isolated Anomalies in Westerly Jet Streams: A Unified Approach
Publisher: American Meteorological Society
Abstract: A weakly nonlinear theory is presented that may explain the persistence of the two main types of low-frequency anomalies observed in the midlatitude jet stream by Dole and Gordon (1983). The theory describes how nonlinearity ...
A Theoretical and Diagnostic Study of Solitary Waves and Atmospheric Blocking
Publisher: American Meteorological Society
Abstract: Theories which associate atmospheric blocking with isolated ?free mode? solutions of the equations of motion are reviewed and the central role played by the potential function ? ≡ dq/d? (where q is the is the quasi-geostrophic ...
Persistent Jet Stream Intensifications: A Comparison between Theory and Data
Publisher: American Meteorological Society
Abstract: A diagnostic study of persistent intense jet stream events in the Pacific has been carried out with a 15 winter NMC dataset to assess the relevance of the weakly nonlinear model recently proposed by Haines and Malanotte-Rizzoli. ...
Sea Level Assimilation Experiments in the Tropical Pacific
Publisher: American Meteorological Society
Abstract: Idealized twin experiments with the HOPE ocean model have been used to study the ability of sea level data assimilation to correct for errors in a model simulation of the tropical Pacific, using the Cooper and Haines method ...
Salinity Assimilation Using S(T): Covariance Relationships
Publisher: American Meteorological Society
Abstract: Assimilation of salinity into ocean and climate general circulation models is a very important problem. Argo data now provide far more salinity observations than ever before. In addition, a good analysis of salinity over ...
Initialization of Seasonal Forecasts Assimilating Sea Level and Temperature Observations
Publisher: American Meteorological Society
Abstract: In this paper, the combined assimilation of satellite observed sea level anomalies and in situ temperature data into a global ocean model, which is used to initialize a coupled ocean?atmosphere forecast system, is described. ...