North Temperate Lakes LTER: Ice Duration - Trout Lake Area 1981 - current
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https://portal.edirepository.org/nis/mapbrowse?packageid=knb-lter-ntl.32.31
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Data includes day of freeze-up and thaw dates of seven northern primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, Crystal Bog, and Trout Bog). Observations are made approximately every other day during times of freeze and thaw. A lake is considered ice covered when the sampling station (the deepest part of the lake) is ice covered. The lake is considered thawed when it is possible to drive a boat from the boat landing to the sampling station without encountering ice.
The ice duration is the number of days during the winter season that the lake surface was frozen. This is calculated using the average date of ‘lastopen’ and ‘ice_on’ for freeze-up, and the average date of ‘lastice’ and ‘ice_off’ for the thaw. The average is rounded forward. A few early years do not have all four dates so duration in those cases use whatever dates are available. The ‘comments’ column notes the dates when multiple freeze/thaws occurred during the winter.
Sampling Frequency: annually. Number of sites: 7.
提供机构：
Environmental Data Initiative
创建时间：
2024-05-02
