flacaltenn
Diamond Member
Attempt to go back to the topic.. Interesting observation from studies on Lake Tahoe where a warming trend has also been identified. Actual water temp measurements since the 60s show about 1.5degF warming. HOWEVER -- NASA satellite data shows "over 3 degrees of warming in just last 16 years".. Needs to be resolved. And the study in THIS OP relies very heavily on satellite measurements.
NC Media Watch: Will Lake Tahoe soon reach boiling point? (Updated 12-27-09, 2027)
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So what other effects might be in play here? Certainly Lake Tahoe has been fighting a clarity issue since all the feeders into the lake have been HIGHLY affected by development alongside river/streams. Leading to a very noticeable decline in water clarity which can increase direct solar absorption of heat.
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Secchi depth is a test where a white plate is lowered until it can't be seen..
Then there's the side-effects of regulations to control turbidity and pollutants in the feeder systems for the Lake. Highly restricted on what runs off into the Lake throughout the season. Which COULD mean that there is less volume filling the lake or that the streams/rivers are SHALLOWER than before leading to higher temperatures of the new waters entering the lake.
Don't know -- can't tell. Too many possibilities to pin that increase JUST on IR backradiation from increased CO2. Which we already know doesn't directly efficiently heat a volume of water.
Thanks! That's an interesting idea that I hadn't heard of before.
It's not really UHI effect but it is related. Instead we see past temperatures cooled, whereas this is another reason for them to be raised (or present temps to be cooled).
The lake level has been noticeably lower during the past decade as well. Not totally related to annual precipt, but more related to all the controls and regulations put on the drainage into the lake. Could very well be man-made warming -- but not just related to atmospheric effects.
Lake Tahoe Storage | Truckee Meadows Water Authority
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