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RISThe Modeled Response of the Mean Winter Circulation to Zonally Averaged SST Trends
Publisher: American Meteorological Society
Abstract: The response of the atmospheric winter circulation in both hemispheres to changes in the meridional gradient of sea surface temperature (SST) is examined in an atmospheric general circulation model. Climatological SSTs are ...
The Role of Tropospheric Rossby Wave Breaking in the Pacific Decadal Oscillation
Publisher: American Meteorological Society
Abstract: The leading pattern of extratropical Pacific sea surface temperature variability [the Pacific decadal oscillation (PDO)] is shown to depend on observed variability in the spatiotemporal distribution of tropospheric Rossby ...
The Role of Rossby Wave Breaking in Shaping the Equilibrium Atmospheric Circulation Response to North Atlantic Boundary Forcing
Publisher: American Meteorological Society
Abstract: The role of Rossby wave breaking (RWB) is explored in the transient response of an atmospheric general circulation model to boundary forcing by sea ice anomalies related to the North Atlantic Oscillation (NAO). When the ...
Tropospheric Rossby Wave Breaking and the NAO/NAM
Publisher: American Meteorological Society
Abstract: Objective analysis of several hundred thousand anticyclonic and cyclonic breaking Rossby waves is performed for the Northern Hemisphere (NH) winters of 1958?2006. A winter climatology of both anticyclonic and cyclonic ...
Response of the Wintertime Northern Hemisphere Atmospheric Circulation to Current and Projected Arctic Sea Ice Decline: A Numerical Study with CAM5
Publisher: American Meteorological Society
Abstract: he wintertime Northern Hemisphere (NH) atmospheric circulation response to current (2007?12) and projected (2080?99) Arctic sea ice decline is examined with the latest version of the Community Atmospheric Model (CAM5). The ...
Semigeostrophic Theory on the Hemisphere
Publisher: American Meteorological Society
Abstract: This paper presents the combined isentropic and spherical geostrophic coordinate version of semigeostrophic theory. This is accomplished by first proposing a spherical coordinate generalization of the geostrophic momentum ...
Vorticity Coordinates, Transformed Primitive Equations, and a Canonical Form for Balanced Models
Publisher: American Meteorological Society
Abstract: A potential pseudodensity principle is derived for the quasi-static primitive equations on the sphere. An important step in the derivation of this principle is the introduction of ?vorticity coordinates??that is, new ...
Wave Activity Diagnostics Applied to Baroclinic Wave Life Cycles
Publisher: American Meteorological Society
Abstract: Wave activity diagnostics are calculated for four different baroclinic wave life cycles, including the LC1 and LC2 cases studied by Thorncroft, Hoskins, and McIntyre. The wave activity is a measure of the disturbance ...
Dynamics of Landfalling Atmospheric Rivers over the North Pacific in 30 Years of MERRA Reanalysis
Publisher: American Meteorological Society
Abstract: large-scale analysis of landfalling atmospheric rivers (ARs) along the west coast of North America and their association with the upper-tropospheric flow is performed for the extended winter (November?March) for the years ...
The ITCZ in the Central and Eastern Pacific on Synoptic Time Scales
Publisher: American Meteorological Society
Abstract: The ITCZ in the central and eastern Pacific on synoptic time scales is highly dynamic. The active season extends roughly from May through October. During the active season, the ITCZ continuously breaks down and re-forms, ...