The desert will not go away completely the Red Sea does not make the surrounding lands green pastures, and an inland sea in the Sahara won't do so either.ĭepending on the outlet, it is possible that the stream of salt water enters a stream of sweet water (e.g. The effect consists in dampening temperature extremes in the Sahara area and in a reduction of the deserted area. Now the water circuit is closed and the Mariana trench never runs dry.Ĭlimatic change depends mainly on the size of the basins filled with salt water: The larger they are, the bigger the effect. It will create a river of salt water that may fill up some basins and eventually reaches the sea (either the Mediterranean sea or the Atlantic Ocean). Salt water under high pressure (from the ground of the Mariana trench) wells up at some point in the Sahara desert, becoming a fine source of hydroelectric power. The internal ocean water however will heat up on average.įirst observation: The portals as described in the question create a perpetuum mobile. The giant maelstrom around the Mariana Trench is going to cause a lot of mixing in the Pacific Ocean, so most of that ocean is going to be a lot colder than it was before.Īll of this cold water near the surface everywhere will mean that the Earth will radiate away much less energy and that there will be much less energy to drive atmospheric processes. This water is going to be under 10 degrees Celsius, so it'll cool down equatorial areas by a lot. Most of North Africa is going to get flooded, I have no clue what that will do with the climate. This means no more warm water flowing to the North Atlantic so that's a new ice age for Europe. The remaining flow is still a good 20 times the amount of water the Gulf Stream transports at its peak, so I would wager all ocean currents stop doing what they're doing and start flowing towards the South-West Pacific. Some speculation on what would happen if the water didn't heat up: Some animals and some humans in those parts of the world could possibly survive this for a few years. It will take probably take a few days for the effects of the sudden change of energy distribution to be transported by the jet steam towards the America's and the remaining parts of Asia, so they've got maybe another week before the freak weather begins (think hurricanes, extreme rainfall, etc.). Australia is closest to the Mariana Trench, so the weather there will turn weird after a day. So the America's, most of Asia and Australia will likely not flood. The shortest path from the Saharan portal back to the Mariana Trench is through the Himalaya's, so my guess is the water will mainly flow through Africa towards the Southern Atlantic and through Southern Europe the Eastern part of Africa and the Arabian Peninsula into the Indian Ocean. Next to go is anything within a few hundred kilometers of the Mariana Trench and anything in Northern Africa.Įurope and the rest of Africa will soon (within hours? days? weeks?) follow. After that anything going through the portal will die. The first creatures to die is probably a fish being blasted into an unlucky scorpion at high speed. This means that the Earth wouldn't cool nearly as fast as it normally would.Īnd, at some point, maybe after a few years, maybe after several decades, even if you were to turn off the portal, the increased greenhouse gases and incoming energy from the Sun will will cause a runaway greenhouse effect and turn Earth into Venus. To add to this, warmer water evaporates more readily, and water vapor is also a very strong greenhouse gas. We've managed to increase it by about 50% or so in the last hundred years. So, if all the oceans heat up 25 degrees, the carbon dioxide in the atmosphere is going to increase by factor of 10 or so. This is actually much more complicated than dividing by a third. Water of about 30 degrees Celsius can store only about a third of what water of 4 degrees can store. However, if water is heated, it can't store as much carbon dioxide. There is a lot of carbon dioxide stored in the oceans, around 60 times that of the pre-industrial atmosphere. Greenhouse gases like carbon dioxide reflect this radiation back at us. Normally, the Earth radiates away energy as long wave, or infra red radiation. So it then takes a few centuries for all the water to boil off and turn into vapor. Dropping from that pressure to pressure at sea level gives a flow speed of somewhat over 400 meters per second: $\sqrt$. Let's say your portal is 10km below sea level. pointed out, the amount of energy is not 'maybe a long term thing', it's the Major Issue. But it has no idea what it's got coming with this portal of yours. The climate of Earth has been roughed up quite a bit last century.
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