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Annual indices of sea ice severity in Hudson Strait, for the period 1751 to 1870, are derived from written historical evidence
contained in ships' log-books. These logs were all kept on Hudson's Bay Company ships sailing from London to the Company's
trading posts. The log-books are homogeneous in nature and this property facilitates their numerical interpretation. The annual
indices are subjected to face validity testing which indicates that they may plausibly be accepted as measures of sea ice
severity. The results are examined in relation to the presentday behaviour of sea ice in Hudson Strait and they provide evidence
that the summer severity of ice conditions is mainly determined by atmospheric circulation conditions. 相似文献
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