. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 9-4. 700-mb (~33 km) height pressure chart for April 1976 (labeled in dekameters) (after Wagner 1976). normal ice cover by April 1979. Again, some indica- tion of the mildness of conditions in the Pribilof Islands is given by the mean monthly temperature for April 1979 of C (~ C above normal) under the m/sec southerly component of the surface wind (~ m/sec above normal southerly flow). During this period of January 1976 to May 1979 there were 13 months during which t
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 9-4. 700-mb (~33 km) height pressure chart for April 1976 (labeled in dekameters) (after Wagner 1976). normal ice cover by April 1979. Again, some indica- tion of the mildness of conditions in the Pribilof Islands is given by the mean monthly temperature for April 1979 of C (~ C above normal) under the m/sec southerly component of the surface wind (~ m/sec above normal southerly flow). During this period of January 1976 to May 1979 there were 13 months during which there were mean southerly winds in the Pribilof Islands. Seven of these months were within the November-May ice season. Fig. 9-6 illustrates the regression of the January southern ice extent over the years 1975-79, showing that the ice edge in the eastern Bering Sea has re- treated ~550 km over this period. Table 9-1 shows that the rather dramatic rise in the mean January air temperature in the eastern Bering Sea coincided with the ice retreat and the shifting of the north-south component of the surface wind from north to south. Thus, in the period 1975-79 the mean January air temperature has risen ~ C, coinciding with a northerly to southerly shift in winds of ~ m/sec (~12 kn) over 1976-79. As mentioned previously, this coincides with the dramatic retreat of the ice edge (Figs. 9-2 and 9-6) and the rise in SST (Fig. 9-3). TABLE 9-1 January mean air temperatures with deviation from the mean and the monthly mean North-South component of the surface wind with the deviation from the mean from the Pribilof Islands for the period 1975-79 Air Deviation N-S surface Deviation temperature from mean wind from mean January (T) (T°C) (m/sec) (m/sec) 1975 1976 1977 1978 1979
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