. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Shelf environment 457 present time during fisheries investigations under the aegis of the International North Pacific Fisheries Commission (INPFC) and other studies during this period have been summarized by Dodimead et al. (1963) and Favorite et al. (1976); and recent OCSEAP and PROBES studies are summarized in Chapters 1-8 of this book. MONTHLY MEAN CONDITIONS Ice information presented is based on data from Potocsky (1975) and recent satellite imagery; temp- er
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Shelf environment 457 present time during fisheries investigations under the aegis of the International North Pacific Fisheries Commission (INPFC) and other studies during this period have been summarized by Dodimead et al. (1963) and Favorite et al. (1976); and recent OCSEAP and PROBES studies are summarized in Chapters 1-8 of this book. MONTHLY MEAN CONDITIONS Ice information presented is based on data from Potocsky (1975) and recent satellite imagery; temp- erature and salinity data are based on the current (June 1979) NODC geofile (including OCSEAP data) and Japanese and NWAFC fisheries cruises. These last data have been computer-processed into monthly means by V2° (lat.) and 1° (long.) quadrangles, and anomalies are derived from these means; however, only summaries of conditions for winter (January- March), May, July, and September are presented and discussed. There are several limitations to the presen- tations of mean conditions in this area: first, data are not sufficient for summaries by V2 X 1° quadrangles (nor even 2 X 2°), and thus there are numerous gaps in each month and only limited data from October to March. Second, equivalent data were not acquired in warm and cold years; thus in some instances the values represent mean conditions, in others (in warm or cold years) possibly extremely anomalous conditions. (The numbers of observations and years are not presented here, but are available at NWAFC.) Third, the paucity of data can also result in isolated anomalous values and tonguelike protrusions that may merely reflect a preponderance of data from a single year rather than a significant environmental feature. Nevertheless, the data reflect a high degree of continuity of conditions throughout the area that cannot be obtained in any other manner. Ice In the northern Bering Sea, monthly mean air temperatures vary from 1
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