Nikolai Lofving Hersfeldt
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Earth orbitting a K2-type star
🕑 Added 2023-10-16 10:03:39 +0000 UTCFirst of the next series of models I'm running after eccentricity, placing earth in orbit of other stars. The general approach here is working out appropriate parameters for a typical main sequence star of a certain effective temperature, setting a year length and solar flux appropriate for a roughly Earth-analagous position in that star's habitable zone (4% of the distance from the inner conservative HZ edge to the outer edge), keeping CO2 at 300 ppm, and then adjusting solar flux to get a global average temp around 15 C.
So this one is for a star with an effective temperature of 5000 K, and I'll do 4000 and 3000 K as well (and some hotter stars as well; and I'll eventually do even cooler stars when I get around to tidal-locked planets). It's a pretty subtle change so far, but you can see generally cooler summers due to the shorter year (I haven't written down all the parameters anywhere convenient just yet but it should be about half the length of our years).
Comments
Nikolai Lofving Hersfeldt
Antarctica and east africa are partially just issues with exoplasim's model at this resolution and the particular setup here; compare to the baseline model run at close to Earth's actual parameters https://worldbuildingpasta.blogspot.com/2022/05/climate-explorations-temperature.html#baseline . There is still notably more tundra and equatorial rainforest here, likely because of shorter, milder seasons.
Thanasis Kinias
This is interesting! The most notable change seems to be the really dramatic expansion of tundra. I presume this is a result of shorter summers meaning that you never get a <10°C growing season? But then there’s the appearance of tundra in Antarctica as well—is that because the winter doesn’t get a deep, so even the short summer is enough to bring temps up above freezing? The other thing I notice here is the rainforest in East Africa. Do you know what’s going on there? Has the Indian Ocean monsoon been disrupted?
