Abstract
Thirty B2 type circulations (a blocking type pattern characterized by clear stationary troughs were proposed in the previous paper (Tsuchiya, 1963)) are selected at a certain criterion from the data of thirteen winter seasons for December 1944-February 1957. Then their climatic features are examined using daily meteorological data at nearly 100 stations of the middle latitudes in Northern Hemisphere. And we found out that there are clear temperature and precipitation anomalies over the eastern North America, the western Europe and the vicinity of Japan. This anomaly pattern resembles the continental glacier distribution during Pleistocene period.
Milankovitch presented a theory that seasonal and latitudinal secular variation of insolation computed from the earth's orbital movement as a planet explains the glacial growth. In connection with it, this paper describes the fact that the variation of insolation is favourable for causing the B2 type pattern in general circulation in winter. It is considered that Milankovitch's hypothesis is reasonable in the light of the modern theory and the observed fact on general circulation of the atmosphere.
Finally, as an example of the process of the B2 type circulation, discussion is made on the abnormal worldwide cold wave observed in the winter of 1962/63.
