Prior studies have demonstrated decreasing cerebral blood flow (CBF) in normal aging, but the full spatial pattern and potential mechanism of changes in CBF remain to be elucidated. Specifically, existing data have not been entirely consistent regarding the spatial distribution of such changes, potentially a result of neglecting the effect of age-related tissue atrophy in CBF measurements. In t...

This study addresses the role of soil moisture and its interaction with the overlying atmosphere in setting up climate anomalies over South America during El Niño years using observations as well as Atmospheric General Circulation Model (AGCM) simulations. It is found that during summertime land–atmosphere interaction is instrumental in setting the spatial pattern and sign of surface air temper...

Forecasts of summer weather patterns months in advance would be of great value for a wide range of applications. However, seasonal dynamical model forecasts for European summers have very little skill, particularly for rainfall. It has not been clear whether this low skill reflects inherent unpredictability of summer weather or, alternatively, is a consequence of weaknesses in current forecast ...

Circulation times (P32 from the antecubital and femnoral veins to a peripheral artery) and roentgenographic studies of the pattern of venous distribution of a radio-opaque substance (Diodrast introduced through a cardiac catheter into the axillary vein and'the inferior vena cava below the diaphragm) have been performed during the expiratory effort of the Valsalva maneuver. In normal subjects th...

This study examines the temporal evolution of the tropospheric circulation following large-amplitude variations in the strength of the Southern Hemisphere (SH) stratospheric polar vortex in data from 1979 to 2001 and following the SH sudden stratospheric warming of 2002. In both cases, anomalies in the strength of the SH stratospheric polar vortex precede similarly signed anomalies in the tropo...

[1] Droughts over the central United States (US) are modulated by sea surface temperature (SST) variations in the eastern tropical Pacific. Many models, however, are unable to reproduce the severity and spatial pattern of the ‘‘Dust Bowl’’ drought of the 1930s with SST forcing alone. We force an atmosphere general circulation model with 1930s SSTs and model-generated dust emission from the Grea...

This study examines the pattern transition of dust events identified based on RGB images from Himawari-8 satellite, along with associated key circulations and dynamic features, during spring 2016-2020. The are ordered onto a 4 × 3 topological map according to spatial similarity distribution using self-organizing maps. In this map, exhibits mainly an eastward displacement or amplification Taklim...