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RISHorizontal Divergence Associated with Zonally Isolated Jet Streams
Publisher: American Meteorological Society
Abstract: Horizontal divergence in the upper troposphere associated with zonally isolated jet streams in the climatological-mean fold for the Northern Hemisphere winter is examined by using the wind fields obtained from the NMC ...
Midwinter Suppression of Baroclinic Wave Activity in the Pacific
Publisher: American Meteorological Society
Abstract: Seasonal variations in baroclinic wave activity and jet stream structure in the Northern Hemisphere are investigated based upon over 20 years of daily data. Baroclinic wave activity at each grid point is represented for ...
Interannual Variability of the East Asian Winter Monsoon and Related Modulations of the Planetary Waves
Publisher: American Meteorological Society
Abstract: nterannual variability of the East Asian winter monsoon is investigated through composite analysis applied to observational data for 50 recent years. Although the monsoon activity itself is confined into the lower troposphere, ...
Structure and Mechanisms of the Southern Hemisphere Summertime Subtropical Anticyclones
Publisher: American Meteorological Society
Abstract: The three-dimensional structure and dynamics of the climatological-mean summertime subtropical anticyclones in the Southern Hemisphere (SH) are investigated. As in the Northern Hemisphere (NH), each of the surface subtropical ...
Mechanisms of Meridional Teleconnection Observed between a Summer Monsoon System and a Subtropical Anticyclone. Part I: The Pacific–Japan Pattern
Publisher: American Meteorological Society
Abstract: Summertime atmospheric circulation over the midlatitude western North Pacific (WNP) is influenced by anomalous convective activity near the Philippines. This meridional teleconnection, observed in monthly anomalies and ...
Mechanisms of Meridional Teleconnection Observed between a Summer Monsoon System and a Subtropical Anticyclone. Part II: A Global Survey
Publisher: American Meteorological Society
Abstract: A global survey is conducted for atmospheric anomaly patterns of meridional teleconnection over the summer hemisphere associated with anomalous tropical convection. The patterns may be akin to the Pacific?Japan (PJ) ...
A Formulation of a Phase-Independent Wave-Activity Flux for Stationary and Migratory Quasigeostrophic Eddies on a Zonally Varying Basic Flow
Publisher: American Meteorological Society
Abstract: A new formulation of an approximate conservation relation of wave-activity pseudomomentum is derived, which is applicable for either stationary or migratory quasigeostrophic (QG) eddies on a zonally varying basic flow. The ...
Geographical Dependence of Upper-Level Blocking Formation Associated with Intraseasonal Amplification of the Siberian High
Publisher: American Meteorological Society
Abstract: Intraseasonal amplification events of the surface Siberian high in winter are generally associated with blocking ridge formation in the upper troposphere. Composite analysis applied to the 20 strongest intraseasonal events ...
Mechanisms of Intraseasonal Amplification of the Cold Siberian High
Publisher: American Meteorological Society
Abstract: Mechanisms of intraseasonal amplification of the Siberian high are investigated on the basis of composite anomaly evolution for its strongest events at each of the grid points over Siberia. At each location, the amplification ...
Interannual Seesaw between the Aleutian and Icelandic Lows. Part II: Its Significance in the Interannual Variability over the Wintertime Northern Hemisphere
Publisher: American Meteorological Society
Abstract: Through analysis of observational data for the period of 1973?94, the late-winter formation of an interannual seesaw between the surface Aleutian and Icelandic lows (AL and IL, respectively) is shown to significantly impact ...