Hydrology and Earth System Sciences
www.hydrol-earth-syst-sci.net
1027-5606
1607-7938
8
1
2004
10.5194/hess-8-79-2004
http://www.hydrol-earth-syst-sci.net/8/79/2004/
http://www.hydrol-earth-syst-sci.net/8/79/2004/hess-8-79-2004.html
http://www.hydrol-earth-syst-sci.net/8/79/2004/hess-8-79-2004.pdf
79
87
0000-00-00
The trends and dependencies between air and water temperatures in lakes in northern Poland in 1961–2000
M. Dabrowski
W. Marszelewski
R. Skowron
Institute of Meteorology and Water Management in Warsaw, Branch in Bialystok, ul. Ciolkowskiego 2/3, 15-245 Bialystok, Poland
Nicolaus Copernicus University in Torum, Department of Hydrology and Water Management, ul. Fredry 6, 87-100 Torun, Poland
E-mail for corresponding author: marszel@geo.uni.torun.pl
Over 40 years, from 1961–2000, daily mean values of surface lake water
temperatures at 0.4 m depth in six lakes in northern Poland were recorded with nearby mean
daily air temperatures at 2 m. Air temperatures increased on average from 0.020 to
0.025°C year<sup>–1</sup> while lake-water temperatures varied more but
increased by 0.005 to 0.028°C year<sup>-1</sup>. For shorter periods (for
instance, for 10 days) the pattern of trend directions and values was more complex,
depending on the morphometric and trophic conditions of the lakes. It has been concluded
that changes in lake water temperatures during climate warming may be documented by studies
of lakes located relatively closely together (up to 300 kilometres).</p>
<p style="line-height: 20px;"><b>Keywords: </b>physical limnology, climate changes, lake water, temperature