Abstract: Spatial patterns of circulation variability over the Northern Hemisphere and their changes during the past 70 yr (1899?1969) are examined using eigenvector analyses of mean January and July sea-level pressure maps. The ...

Abstract: The combined representation of fields of three climatic variables with empirical orthogonal functions, herein referred to as eigenvectors, is discussed. The eigenvectors are derived from measurements of monthly mean sea-level ...

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Abstract: General circulation model experiments at 3000-year intervals for the past 18 000 years were made to estimate the magnitude, timing, and pattern of the climatic response to prescribed changes of orbital parameters (date of ...

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Abstract: Intraseasonal fluctuations of satellite-based observations of outgoing longwave radiation (OLR) and NMC analyses of 250 mb zonal wind (U250) are described based on global data from nine Northern Hemisphere summers ...

Abstract: The sensitivity of a low resolution, spectral general circulation model (GCM) to specification of physical processes is examined using a new version of the model with refined parameterizations. Specific refinements in ...

Abstract: Ten years of outgoing longwave radiation (OLR) and 250 mb circulation data are used in a statistical study which concentrates on 28?72 day fluctuations during Northern Hemisphere winter. The results of spectral and ...

Abstract: Four numerical experiments are analyzed to determine the three-dimensional response of the NCAR general circulation model to large prescribed changes in mid-latitude North Pacific Ocean surface temperature. The ocean surface ...

Abstract: Ring widths from trees on certain sites reflect climatic variation. Therefore, long time series derived from replicated and precisely dated ring-width chronologies may be utilized to extend climatic records into prehistoric ...