US Long-Term Ecological Research Network
Ice Phenology Database


<strong>Please note that the official site for downloading this data set is the <a href="">National Snow and Ice Data Center</a>.</strong>This data set contains ice phenology data for 1450 Northern Hemisphere lakes and rivers (note in this document, the term &quot;lakes&quot; refers both lakes and rivers). Over 250 of these lakes have records longer than 50 years; and 70 longer than 100 years. The data are presented in two division. The main division contains 853 Northern Hemisphere lakes. The second division contains 597 Swedish lakes from data provided by Gesa Weyhenmeyer Each of the two divisions has a data table of lake characteristics and a data table containing the ice phenology data.i The lake characteristics includes data range, total number of years of data, and separate counts of non-missing years of data for ice on, ice off and ice duration. Additional information on lakes includes latitude and longitude, and, when available, area, depth, etc. The ice phenology data table includes the start and end year of the winter season, ice on and ice off dates and day numbers as well as ice duration. The day numbers are calculated relative to Dec 31 of the start year of the ice season. E.g., Dec 26 = -5, Dec 31 = 0, Jan 1 = 1, Jan 15 = 15,. Note that some information from the lake characteristics table is joined to the ice phenology datatable for convenience of querying. The following notes can help you query these data: 1. Note that multiple filters use the logical operand &quot;AND&quot; 2. When entering lakecodes or lakenames, the asterisk (*) acts as a &quot;wild card&quot; operator. Example: to get data for Lake Mendota and Lake Baikal, you could enter <b>*mendota* , *Baik*</b> 3. By first querying the Lake Characteristics table, you can learn which lakes&#39; data will be retrieved from a similar query on the Ice Phenology data table. 4. In some cases, the text associated with a filter may be confusing as the query forms generation is done through a previously existing application. For example, the filter for specifying a minimum number of years of iceon data asks the following: <b>Which years of iceon data would you like retrieved? </b> This should be interpreted as: <b>How many years of iceon data should the lakes have to be retrieved? </b> Then enter the minimum number of years <b>AND</b> also a large number to represent the maximum (the maximum is required). 5. If you click the box for &quot;all years of iceon data&quot;, you will get all lakes that pass the other filters. To retrieve only lakes with iceon data, set the minimum number of years = 1. 6. The counts of non-missing data for iceon, iceoff and ice duration are for the entire data range of a lake and do not take into account any filters which specify start years that you may have included. Thus the query may return data from lakes that do not meet the intended requirements. This is a result of using software designed for other data. Here is an example illustrating this: Querying for Canadian lakes for start years from 1901 to 2005 with a minimum of 90 years of iceoff data will return Toronto Harbor data because this site has 108 total years of iceoff data. However, many of these years of iceoff data occurred before 1900 and so the query only returns the 32 years of data post 1900. Number of sites: 1450(10905, 10906, 10907, 10908)
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