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RISStatistical Behavior of Transient Eddies near Mountains and Implications for Theories of Lee Cyclogenesis
Publisher: American Meteorological Society
Abstract: We examine the nature and spatial structure of meteorological high-frequency variability in two selected areas, one including the Alps and the other the Rocky Mountains. Seven years of geopotential height data, derived ...
Stationary Response of Barotropic Weakly Nonlinear Rossby Waves to Quasi-Resonant Orographic Forcing
Publisher: American Meteorological Society
Abstract: Stationary solutions and their stability properties of nondissipative barctropic flow in a narrow, longitudinally periodic channel on a ?plane with a sheared basic current and bottom topography are investigated. An analytical ...
A Theory of Deep Cyclogenesis in the Lee of the Alps. Part II: Effects of Finite Topographic Slope and Height
Publisher: American Meteorological Society
Abstract: The theory of cyclogenesis in the lee of the Alps presented by Speranza et al. in Part I is reexamined here (Part II) in the context of models dealing with finite amplitude topography. This generalization leads to the ...
A Nudging Scheme for the Assimilation of Precipitation Data into a Mesoscale Model
Publisher: American Meteorological Society
Abstract: A nudging procedure for the assimilation of rainfall data into a mesoscale model [the Bologna Limited Area Model (BOLAM)] has been developed in order to improve short-range forecasting. The scheme modifies the model specific ...
Orographically Induced Cyclogenesis: Analysis of Numerical Experiments
Publisher: American Meteorological Society
Abstract: Cyclogenesis induced by an isolated mountain chain in a baroclinic flow is simulated in a channel version of the HIBU (Mesinger-Janji?) primitive equation model. The main features characteristic of cyclogenesis in the Ice ...
Instabilities of a Baroclinic Flow Related to Topographic Forcing
Publisher: American Meteorological Society
Abstract: The presence of bottom topography in a baroclinic flow modifies the properties of the propagating baroclinic unstable modes and allows for the appearance of new unstable modes which are nonpropagating, as first shown by ...
Coupling between the Atmospheric Circulation and the Ocean Wave Field: An Idealized Case
Publisher: American Meteorological Society
Abstract: This work studies the two-way coupling between the atmospheric circulation and the ocean surface wave field, as it is described by the recent observations and theories on the dependence of the sea surface roughness on the ...
A Theory of Deep Cyclogenesis in the Lee of the Alps. Part I: Modifications of Baroclinic Instability by Localized Topography
Publisher: American Meteorological Society
Abstract: Observational and numerical studies on Alpine cyclogenesis have shown that a developing baroclinic wave approaching the mountain region gives rise to a disturbance of dipolar structure, extending throughout the troposphere ...
The Meteorological Model BOLAM at the National Observatory of Athens: Assessment of Two-Year Operational Use
Publisher: American Meteorological Society
Abstract: Since November 1999, the hydrostatic meteorological Bologna Limited-Area Model (BOLAM) has been running operationally at the National Observatory of Athens. The assessment of the model forecast skill during the 2-yr period ...