From: <Rick.Sylvia_at_ferguson.com> > Currently, I've got a lanyard attached to the thermometer, and I just drop it > overboard and drag it along for about 10 minutes. When I drag it, it's only > about an inch underwater. It's got holes in the top and bottom, so it gets > water flowing through it as it's dragged along. I've never done anything like this, but I will mention that moving the thermometer will result in slightly different temperatures than keeping it still - think of wind chill. As well, the water temperatures can change dramatically with depth. The top layers can be significantly warmer due to sunlight absorption, rainfall etc, and can be warmed or cooled by wind. If you get more than a few inches down, the temp can drop a lot - however, it may vary more slowly over time. Therefore, measuring the temperature at the same depth is important if you want a realistic comparison from day to day. Measuring the temp profile with depth can be interesting - attaching the thermometer to a knotted line and measuring at each knot each time will show how temps change with depth over time. If you're on a boreal lake, you might even catch the seasonal turnover (I forget what that's called) if you measure year round. Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Fri Jul 05 2002 - 08:55:13 PDT
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