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RISA Simple Kinematic Source of Skewness in Atmospheric Flow Fields
Publisher: American Meteorological Society
Abstract: eopotential height fields exhibit a well-known pattern of skewness, with distributions that are positively skewed on the poleward side of the midlatitude jets/storm tracks and negatively skewed on the equatorward side. ...
The North Atlantic Jet Stream under Climate Change and Its Relation to the NAO and EA Patterns
Publisher: American Meteorological Society
Abstract: his paper describes recent variations of the North Atlantic eddy-driven jet stream and analyzes the mean response of the jet to anthropogenic forcing in climate models. Jet stream changes are analyzed both using a direct ...
On the Persistence and Predictability Properties of North Atlantic Climate Variability
Publisher: American Meteorological Society
Abstract: The persistence and climate noise properties of North Atlantic climate variability are of importance for trend identification and assessing predictability on all time scales from several days to many decades. Here, the ...
Impact of Atmospheric Blocking on South America in Austral Summer
Publisher: American Meteorological Society
Abstract: AbstractThis study investigates atmospheric blocking over eastern South America in austral summer for the period of 1979?2014. The results show that blocking over this area is a consequence of propagating Rossby waves that ...
The Eddy-Driven Jet and Storm-Track Responses to Boundary Layer Drag: Insights from an Idealized Dry GCM Study
Publisher: American Meteorological Society
Abstract: AbstractSimulations using a dry, idealized general circulation model (GCM) are conducted to systematically investigate the eddy-driven jet?s sensitivity to the location of boundary layer drag. Perturbations of boundary ...
Eddy-Driven Jet Sensitivity to Diabatic Heating in an Idealized GCM
Publisher: American Meteorological Society
Abstract: AbstractThe eddy-driven jet is studied using a dry idealized model to determine its sensitivity to thermal forcings. The jet latitude, speed, and variability are investigated under a series of Gaussian patch thermal forcing ...
Tropical and Extratropical Responses of the North Atlantic Atmospheric Circulation to a Sustained Weakening of the MOC
Publisher: American Meteorological Society
Abstract: The tropospheric response to a forced shutdown of the North Atlantic Ocean?s meridional overturning circulation (MOC) is investigated in a coupled ocean?atmosphere GCM [the third climate configuration of the Met Office ...
Persistent Circulation Regimes and Preferred Regime Transitions in the North Atlantic
Publisher: American Meteorological Society
Abstract: he persistent regime behavior of the eddy-driven jet stream over the North Atlantic is investigated. The North Atlantic jet stream variability is characterized by the latitude of the maximum lower tropospheric wind speed ...
Winter and Summer Northern Hemisphere Blocking in CMIP5 Models
Publisher: American Meteorological Society
Abstract: he frequencies of atmospheric blocking in both winter and summer and the changes in them from the twentieth to the twenty-first centuries as simulated in 12 models from phase 5 of the Coupled Model Intercomparison Project ...
Wave-Breaking Characteristics of Northern Hemisphere Winter Blocking: A Two-Dimensional Approach
Publisher: American Meteorological Society
Abstract: his paper generalizes and applies recently developed blocking diagnostics in a two-dimensional (2D) latitude?longitude context, which takes into consideration both mid- and high-latitude blocking. These diagnostics identify ...