Summer sea ice severity in Hudson Strait, 1751–1870

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