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17

Slight frame-challenge. I'd suggest detonating them in the highest level of the reaches of the atmosphere, Just outside the limits of the exosphere. (About 1000 Km up) The detonations should happen on the side of the planet facing the sun (such as it is, far away). Maths: Each 10 Mt explosion consists of $4.6*10^{16}$ joules, 35% of which would be thermal ...


8

I'll repost what I told you on Reddit, as this looks like the same map: For the most part the climate won't be any different as no major currents are interrupted outside the Arctic, but the change there won't make it any warmer so it'll still be Köppen ET/EF. Where you've added large inland bodies of water expect the Köppen classification to distort the ...


6

Not that much Deep currents Honestly because the north sea is so shallow and because the submerged doggerland island is still there, the deep north sea currents will barely be affected. Here are the real north sea currents. All you really lose is the central north sea current which is pretty minor. Surface currents Now these will really be bothered but ...


6

The earth every hour receives 430 quintillion Joules of energy, where 1 qunitillion = 10^18. The energy from a 1 Megaton nuclear bomb is 4.18*10^15 joules. Thus, a nuke of 10 MegaTon TNT equivalent releases 1000th the part of hourly radiation of sun. There are estimated around 14000 nukes in the world. If you burst all of them simultaneously, you will only ...


4

These hypothetical people might be better off using their magical device to create volcanic eruptions. When a volcano goes off, it releases a significant amount of greenhouse gases as well as ash and lava, so the heating would be more of a cumulative process. You wouldn't just be relying on the heat from the explosions, but using the resulting gases to help ...


3

Use the nukes to thicken the atmosphere by selective rock shattering. All the other answers so far have good maths re energy and warming and such, and I'm not going to repeat good work, but there is one more possibility - greenhouse effects and geological carbon sinks. Detonate your nukes at the bottom of the sea, such that it fractures rock. You haven't ...


2

There is a possible ambiguity with "40% as bright as our sun" and "daylight is as bright as Mars" - orange stars will emit more infrared in comparison to visible light than the Sun. If that refers to total energy received, you may need some other greenhouse gases in the atmosphere, such as methane, to keep it habitable. (1200 ppm CO2 is a ...


1

Cooked Earth (eventually) In the short term(1 year): Darkness descends on the whole earth. No sunlight, no photosynthesis. All plants die, which promptly leads to all animal life starving. Or possibly choking to death on all the released CO2 and methane from decomposition of a couple trillion tons of dead plants. The Sphere prevents heat loss by perfectly ...


1

I don't know if someone will read this coment nor if this information is still relevant, but i live in south-east Brazil and here we have subtropical rainforests because the altitude makes it happen. What i can say about the forests here is that it has three types, based in the precipitacion, mostly. All of them are a transitional forest between the atlantic ...


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