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RISDynamics of Zonal-Mean Flow Assimilation and Implications for Winter Circulation Anomalies
Publisher: American Meteorological Society
Abstract: Seasonally averaged 200-mb circulations for recent winters (1987/88 and 1988/89) that represent opposite phases of El Niño and a zonal-mean zonal flow index cycle are diagnosed using data assimilated by the Goddard Earth ...
Influence of Orography on the Extratropical Response to El Niño Events
Publisher: American Meteorological Society
Abstract: The contribution of the interaction between tropically forced circulation anomalies and the extratropicalmountains in the generation of extratropical circulation anomalies during the 1987/88 and 1988/89 winter seasons is ...
On the Forcing of ENSO Teleconnections by Anomalous Heating and Cooling
Publisher: American Meteorological Society
Abstract: ENSO teleconnections were originally regarded as a single train of stationary Rossby waves generated by a compact region of enhanced (reduced for La Niña) equatorial convective heating. While more recent studies have greatly ...
Do Stationary Waves Drive the Zonal-Mean Jet Anomalies of the Northern Winter?
Publisher: American Meteorological Society
Abstract: The role of zonal-mean zonal flow (u) perturbations in generating anomalous stationary waves has been acknowledged since the 1939 study by Rossby and his collaborators. However, the dynamical mechanisms, which in turn ...
Linearity in ENSO's Atmospheric Response
Publisher: American Meteorological Society
Abstract: The linearity, or extent of antisymmetry, of El Niño and La Niña heating and circulation anomalies is examined for the period 1950?2000. Characteristic structures are obtained by compositing winter season anomalies for ...
Zonal-Eddy Dynamics of the North Atlantic Oscillation
Publisher: American Meteorological Society
Abstract: This research is an attempt to understand the dynamical mechanisms that drive the wintertime North Atlantic oscillation (NAO) on monthly and longer timescales. In an earlier work by DeWeaver and Nigam, the authors showed ...
Atmospheric Circulation and Its Effect on Arctic Sea Ice in CCSM3 Simulations at Medium and High Resolution
Publisher: American Meteorological Society
Abstract: The simulation of Arctic sea ice and surface winds changes significantly when Community Climate System Model version 3 (CCSM3) resolution is increased from T42 (?2.8°) to T85 (?1.4°). At T42 resolution, Arctic sea ice is ...
The Response of the Extratropical Hydrological Cycle to Global Warming
Publisher: American Meteorological Society
Abstract: The change in the hydrological cycle in the extratropics under global warming is studied using the climate models participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report. The changes ...
ENSO Diabatic Heating in ECMWF and NCEP–NCAR Reanalyses, and NCAR CCM3 Simulation
Publisher: American Meteorological Society
Abstract: Diabatic heating associated with El Niño?Southern Oscillation (ENSO) variability is residually diagnosed from the European Centre for Medium-Range Forecasts (ECMWF) and National Centers for Environmental Prediction ...
Persistence and Inherent Predictability of Arctic Sea Ice in a GCM Ensemble and Observations
Publisher: American Meteorological Society
Abstract: The temporal characteristics of Arctic sea ice extent and area are analyzed in terms of their lagged correlation in observations and a GCM ensemble. Observations and model output generally match, exhibiting a red-noise ...