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RISUral Blocking as an Amplifier of the Arctic Sea Ice Decline in Winter
Publisher: American Meteorological Society
Abstract: AbstractIn this paper, the lead?lag relationship between the Arctic sea ice variability over the Barents?Kara Sea (BKS) and Ural blocking (UB) in winter (DJF) ranging from 1979/80 to 2011/12 is examined. It is found that ...
The Role of Downward Infrared Radiation in the Recent Arctic Winter Warming Trend
Publisher: American Meteorological Society
Abstract: AbstractDuring the past three decades, the most rapid warming at the surface has occurred during the Arctic winter. By analyzing daily ERA-Interim data, it is found that the majority of the winter warming trend north of ...
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part II: Free Mode Characteristics of NAO and Diagnostic Study
Publisher: American Meteorological Society
Abstract: Through calculating the scatter diagrams of the streamfunction (?P or ?T) versus potential vorticity (PV) (qP or qT), where ?P and ?T are the planetary-scale streamfunction and total streamfunction, respectively, and using ...
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part III: Meridional Displacement of Westerly Jet Anomalies during Two Phases of NAO
Publisher: American Meteorological Society
Abstract: In this paper, the north?south variability of westerly jet anomalies during the two phases of the North Atlantic Oscillation (NAO) is examined in a theoretical model. It is found that the north?south variability of the ...
A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode
Publisher: American Meteorological Society
Abstract: his study investigates the relationship between El Niño?Southern Oscillation (ENSO) and southern annular mode (SAM) events with an idealized general circulation model. A series of model calculations are performed to examine ...
Dynamical Relationship between the Phase of North Atlantic Oscillations and the Meridional Excursion of a Preexisting Jet: An Analytical Study
Publisher: American Meteorological Society
Abstract: In this paper, it is shown from an analytical solution that in the presence of a preexisting jet the interaction between the zonal jet and the topography of the land?sea contrast (LSC) in the Northern Hemisphere (NH) tends ...
The Impact of ENSO on Wave Breaking and Southern Annular Mode Events
Publisher: American Meteorological Society
Abstract: This study examines the relationship between intraseasonal southern annular mode (SAM) events and the El Niño?Southern Oscillation (ENSO) using daily 40-yr ECMWF Re-Analysis (ERA-40) data. The data coverage spans the years ...
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part IV: Planetary and Synoptic Wave-Breaking Processes during the NAO Life Cycle
Publisher: American Meteorological Society
Abstract: Based on a highly idealized, analytical solution of the North Atlantic Oscillation (NAO) derived in Part III of this series, it is shown that wave breaking is not a necessary condition for the occurrence of NAO events. The ...
On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001
Publisher: American Meteorological Society
Abstract: his study presents mechanisms for the polar amplification of surface air temperature that occurred in the Northern Hemisphere (NH) between the periods of 1958?77 (P1) and 1982?2001 (P2). Using European Centre for Medium-Range ...