Abstract
In view of the interrelated nature of component parts of the atmospheric circulation, it is suggested that surface-atmosphere interaction studies should be hemispheric in scope for time intervals beyond a few days. Hemispheric data sources for potentially important surface conditions—sea-surface temperature, snow cover, sea-ice extent, and soil moisture—are discussed and an example of the extent of such data as are readily available is given. This example is discussed in conjunction with the evolving circulation pattern in terms of the origin of anomalous surface conditions and their possible effects. The role of anomalous surface features in relation to November to December climatological persistence is discussed for two regions on the basis of conditions in November and December 1959.
