Submitted by Just_a_happy_artist t3_10q94ji in explainlikeimfive
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Comments
[deleted] t1_j6om0r6 wrote
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Viv3210 t1_j6on3ki wrote
The follow-up question is: why don’t “we” see that yet? Is that global, as in are the oceans a perfect ball shape? (My guess is not) What places have already faced consequences?
NdavG100 t1_j6oo2zz wrote
If i'm not mistaken there is an island which has started to be drowned and lost like a quarter of its area
nim_opet t1_j6oo6oh wrote
We do see it. Pretty much every coastal community is affected; some are more low lying so it’s more noticeable, some coastlines are simply higher and effects such as loss of land are not noticeable.
breckenridgeback t1_j6oomo9 wrote
> The follow-up question is: why don’t “we” see that yet?
We do see it. It has consequences along the coasts everywhere in the world.
The reason it's not, like, submerging entire continents is that most land is more than 9 inches above sea level.
spirosand t1_j6oov08 wrote
Miami and NYC are feeling the effects, king high tides are problematic. It's pretty much worldwide.
Sand beaches just move with the sea level, so there isn't much visible effect.
The ocean is seldom just calm, so it's hard to see actual photos of direct sea level rise. It's more that more and more places are flooding.
Any-Broccoli-3911 t1_j6or03c wrote
Because you don't live in a low altitude region most likely, which is normal since most people live a lot more than 1 meter above the sea level and we won't even get an increase of 1 meter by 2100 in most prediction (though we will get close).
Also, most low altitude regions have dikes to block the sea and river from flooding the land.
aspheric_cow t1_j6orxb7 wrote
We do see it, mainly in the form of flooding from storms. The flooding is worse because the sea level is high to begin with, and you've got storm surges etc. on top of that. Many coastal cities are building flood barriers.
maveric_gamer t1_j6os8j0 wrote
I think you're thinking of Tuvalu - they're a Polynesian island nation that are currently trying to recreate all of their cultural heritage digitally and back it up into online spaces to preserve it, as it is one of the first nations to have a significant portion of its land area submerged by rising sea levels.
Eithersnore t1_j6ou8g6 wrote
Follow up question, how do they measure the sea level?
-au-re-li-us- t1_j6ouyiw wrote
The ocean is actually something of an oblong oval that is pulled into that shape by the gravity of the moon. The tides are this oval being rotated around the earth as it (the earth) moves relatively to the moon and vice versa.
superbob201 t1_j6ovr42 wrote
Take a bunch of measurements all over the world and do a weighted average.
Mr_Bo_Jandals t1_j6p2fov wrote
Potato_Octopi t1_j6p3zer wrote
You're not going to notice 9 inches over 100 years vs the daily rise and fall of tides.
OculusArcana t1_j6p4qe6 wrote
This is BULLSHIT! I want my beachfront property in Nevada YESTERDAY!! Somebody get me Lex Luthor on the phone!!!
breckenridgeback t1_j6p4uvk wrote
I regret to inform you that the Nevada desert is at an elevation of about 4000 feet.
Spadeninja t1_j6p5hit wrote
I’ve got a beach house I can sell you in Idaho
bradland t1_j6p5kto wrote
I live in South Florida. We see it.
Keep in mind that when they say sea level rise, they’re talking averages. Tides vary already. The ocean level rises and falls on every coastline.
What we’re seeing locally is that high tides inundate areas that weren’t previously subject to inundation, and areas that are normally tidally inundated stay wet longer, and in some places don’t dry out at all.
There’s a local boat ramp nearby that has a storm drain that stays flooded to the top pretty much all the time now. When I was a kid it would only flood with the tide.
We’re also seeing tremendous beach erosion. The shore is at a gradual slope, so every inch or rise moves the shore break a foot or so closer to the dune. This erodes the dune and makes for a short, steep beach.
When I was a kid, you could play frisbee in front of a local beachside pizza shop. That same shop is now atop a sea wall. There is nothing between it and the sea.
jengibredia t1_j6p5ux0 wrote
They are, even places like Malibu the older beach front homes are unliveable because the ocean gets in them when there's storms. The new beach houses have retaining walls.
los-gokillas t1_j6p66d8 wrote
You can see it if you look. I've had a favorite walking spot on the coast of New Hampshire and I can definitely see now how the coast has eroded in the last three years
--LowBattery-- t1_j6p69n7 wrote
Oceans have been rising steady for the last 12500 years. There are thousands of cities/villages/churches/pyramids/etc under water all over the world.
MoarTacos t1_j6p6u2p wrote
I’m sure you get this often, but my reaction to your username and profile pic borderline on visceral.
--LowBattery-- t1_j6p6xj4 wrote
I enjoy the long troll.
formerly_gruntled t1_j6p8ij9 wrote
Ask the folks in Newport News VA about their flooding ocean from streets.
A_California_Guy t1_j6p9rks wrote
Fun facts: human impairment of rivers (ie through dams, dredging, and other changes to their natural flow) has actually slowed sea level rise by a small but not insignificant margin.
Most sea level rise at this point is being driven by melting ices in places like Antarctica, Greenland, and the Arctic.
TrashGeologist t1_j6pbnde wrote
NOAA can use satellites that send down signals and measure the time it takes for it to bounce back. Same idea as a laser measurer you might use around the house, only a lot more lasers in a lot more places over a long period of time
Eithersnore t1_j6pc8d2 wrote
notacanuckskibum t1_j6pcfsq wrote
Check out what has been happening with high tides in Venice.
todlee t1_j6pcwes wrote
Yeah, as the last Ice Age ended. At its lowest point, sea level was 400'+ below where it is today. That was about 20,000 years ago, then it raised steadily for 15,000 years.
About 5000 years ago sea level stabilized, and now it's rising faster than it has in thousands of years. The planet has seen huge swings in sea level -- human civilization has not.
mildly_sexy t1_j6pde4s wrote
Where the water stops
Swedish-Butt-Whistle t1_j6pfi6r wrote
Newtok Alaska is a perfect example of this happening already.
Few know about it because Americans collectively don’t care about what happens to indigenous people. If this was happening in Manhattan the whole world would hear about it.
CurrentOutrageous855 t1_j6pfwln wrote
Just to add to this, there is a common vein that we are helpless and half the coast will disappear. Maldives have expanded, and denmark been dealing with it for centuries
[deleted] t1_j6pfyey wrote
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elkarion t1_j6pgra8 wrote
We're hoping for water to hydralicly split the fault line off so Cali leaves sooner. We need to start filling that sucker now.
DrBoby t1_j6pgrvz wrote
At what hour, there are tides.
Annanake420 t1_j6piaja wrote
Arizona here can confirm.
BruceBannaner t1_j6pj1jm wrote
Please site your source.
[deleted] t1_j6pj8ou wrote
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deadcommand t1_j6pjy98 wrote
They have been, but oceans are massive (to put it lightly) and so it takes a lot to raise them significantly.
[deleted] t1_j6pjz1m wrote
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spirosand t1_j6ol9l5 wrote
The ocean is about 9 inches higher than it was in 1900. It has risen about 3 inches in the last 20 years.
The rate of sea level rise will only increase going forward (we should be at a foot by about 2030). Two to 3 feet by 2100 .
Cheers.