Euro-limpacs Deliverables

ABSTRACT - DELIVERABLE 9

Report providing a descriptive overview of collated available long-term historical data on temperature and ice cover in lakes and rivers relevant to the determination of direct climate change impacts on surface waters

This data report provides a descriptive overview of the long−term historical data on temperature and ice cover in lakes and rivers for Task 3(i) of Work package 1. The extent of the available data is outlined and some examples are provided. The most valuable data sets from the point of view of climate research are those that are not only long, but complete. However, most long−term environmental data series do have gaps, and those described here are no exception. Small gaps can often be filled by interpolation, but larger gaps can cause substantial problems. The frequency of occurrence of large gaps in most of the data sets described here is low enough not to have a serious effect on overall data quality. The data sets described in this report include the following:

i) Daily river water temperature data covering the last 25−35 years. Examples include data from the Rhine (1969−2002) and Rhône (1968−2002),
ii) Monthly mean river water temperature data covering much of the 20th century. Examples include data from the Rhine, Danube and Inn (all 1901−1990),
iii) Monthly lake water temperature profiles covering much of the second half of the 20th century. Examples include data from the Swiss lakes Zürichsee (1936−40; 1945−2004), Greifensee (1956−2004) and Walensee (1972−2002),
iv) Daily lake surface water temperatures covering the last part of the 20th century. Examples include data from Lough Feeagh, Ireland (1960−2004); Windermere, UK (1960−2000) and Müggelsee, Germany (1976−2004).
v) Monthly mean lake surface water temperatures covering much of the 20th century. Examples include data from Lake Constance (1901−1990), Zeller See (1901−1990), Traunsee (1905−1990) and Mondsee (1909−1990), all in Austria.
vi) Historical observations of the timing of ice−on and ice−off on rivers and lakes distributed
vii) Ice cover datasets throughout Europe and the rest of the Northern Hemisphere, including many that go back to the 19th and 18th centuries, and some that extend back even further. Examples include the Tornionjoki River, Finland (ice−off, since 1692/93); the Miramichi River, Canada (ice−off, since 1829/30); Kallavesi, Finland (ice−on and ice−off, since 1833/34); Lej da San Murezzan, Switzerland (ice−off, since 1831/32); Lake Baikal, Russia (ice−off, since 1868/69); and Lake Suwa, Japan (ice−on, since 1443/44).

Very few of the data sets described here have been published and access to the vast majority of them is by arrangement with the respective owners on a case−by−case collaborative basis only.

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