A new study of temperature changes in many of the world's freshwater lakes has been presented, with publication soon in Geophysical Research Letters. The conclusion is the lakes are warming at an average rate of 0.3 degrees C per decade, or 3 degrees C per century. see link
|Comanche Peak Nuclear Power Plant near Granbury, Texas |
Aerial view, image from Google Images
It is simply wrong to perform a study to determine if, and how much, lakes' temperature changes and include those with known human influences. This is exactly what those scientists who measure air temperature have done by including measurements in cities with their known artificial heating from human activities. see link
Still, the lake temperature report apparently has a few lakes that showed a cooling trend. Two reasons the scientists gave for this are 1) shading by trees that block the sun (highly unlikely for a large lake), and 2) meltwater from glaciers. (again, highly unlikely for the lakes in Florida that are cooling).
What is also interesting is this statement:
"Even lakes at the same latitude, which might be expected to have similar responses to warming, showed big differences. “That kind of variation was a big surprise,” " according to one scientist.
This is interesting because it shows the same inconsistency as the adjacent cities not warming at the same rate, as documented earlier here on SLB. ( see link and Figure 7 and surrounding text, showing adjacent cities in the US have very different rates of heating and sometimes cooling)
When the lakes' temperature study is published, it will be interesting to examine the data and determine which artificially heated lakes are included, and what the scientists will do about that. Meanwhile, the pristine areas of the US show a cooling trend for air temperatures. It will be quite interesting to watch the trend of pristine lake temperatures.
Roger E. Sowell, Esq.
Marina del Rey, California
copyright (c) 2016 by Roger Sowell, all rights reserved