we've seen a few videos of these "crystal clean" lakes, and...
clear water like this is generally not indicative of a healthy lake. a healthy lake has plant-like stuff floating around in it.
you know what actually creates that kind of a situation? acidification. the clarity is generally a response of the ph sinking to a point that it can't support any kind of life. these crystal clear lakes that have been destroyed by acidification to the point that they cannot support life are called "dead lakes".
that doesn't mean that every lake that looks like this is the result of acid rain. there are other factors that may create the same result. but a lake in a mountain in slovakia would likely not be this clear unless it's been destroyed by emissions floating south from germany.
Michal Špondr
Maybe there are just no plants in such height. :-P And maybe it's a melted snow which got frozen again, snow doesn't contain animals. If you were right, Europe should be full of such lakes because of the emissions.
deathtokoalas
europe is full of these lakes, and slovakia is the most affected area.
Nox Solitudo
I mean, Slovakia usually gets a lot of emissions floating SOUTH from Germany, and probably north from France too.
deathtokoalas
yeah, it's not like this is something that hasn't been studied to death. there's a lot of industrialization in the east of france, but it's the tremendous industrial production in germany (and, to a lesser extent, production in russia) that are the culprits here. really, it's a little surprising how few people have an awareness of this. if you google something like "acid rain europe", you'll see a number of maps that designate the worst areas as existing in a swath through the center of europe that includes sweden, poland and the former czechoslavakia.
SuperMegaUltraPigeon
I thought it was clear because of the shear altitude meaning there is little dirt or plant/animal life, sort of like an isolated lake.
deathtokoalas
yeah, i know this is an idea out there, but i don't think it's really accurate.
so, why do some high altitude lakes lack fish? obviously, fish need a way to migrate to the lake - they can't fly in. they could maybe get dropped by a bird, but that's a fluke thing, and unless they're asexual or pregnant they can't breed alone anyways. so, a relatively new lake that has no way for fish to get in to it will not have fish in it. but, those factors don't apply as well to other types of life. the idea that high altitudes eliminate soil, plants, insects, mammals, etc is not accurate. these kinds of things exist at all altitudes...
nor is there any connection between the glacial origin of a lake and it's ability to sustain an ecosystem - except that sometimes these lakes have unique ecosystems. there are glacial lakes all over canada with elaborate ecosystems. some of the best fishing is in the rocky mountains.
similarly, high altitudes are not a buffer against the high acidity in the rain in the region - which is well established. looking at pictures of the lake doesn't tell me anything. but a google search for tatra mountains and acid rain pulls up several results.
i'm acknowledging that i'm putting two and two together, here. but acidification is really a far more likely explanation for the clarity of the water than the idea that there's no life or soil because it's an isolated glacial lake. glacial lakes are isolated from the waterways in the region. they're not isolated from all the other ways for life to find their way to them. and, they're generally not void of life - unless they've been acidified.
SuperMegaUltraPigeon
You are probably right, i was just doing my bit of speculation. However i imagine even at such altitudes if the lake wasn't acidified then even some form of algae might live, causing the lake to not be clear.
deathtokoalas
ok, i've deleted enough people regurgitating something they read at some pop science website to make a final point and close the thread. just because you've found a link to something on slashdot or reddit doesn't mean the information in the link is worth reading. and, it's certainly not a reason to swing it around the internet like a biblical quote.
my point is that the popular media perception of this is probably wrong.
yes, black ice is more transparent than snow. but what this describes is how well you can see through the ice. it doesn't describe how well you can see through the water. a healthy lake full of black ice would be...black. because the water would be full of stuff. that's why they call it "black ice".
to get that kind of clarity through the lake, you have to be dealing with extraordinarily clear water - water that really only exists as (1) water coming from treatment plants and (2) water in lakes killed off from acidification.
thread closed.
