The Sun is more active now than over the last 8000 years (2004)

Author: firebaze

Score: 46

Comments: 19

Date: 2020-10-29 22:44:46

Web Link

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abakus wrote at 2020-10-30 00:18:57:

How much of the global warming can be explained by this increased sun activity?

smitty1110 wrote at 2020-10-30 00:38:05:

Almost none [1]. In theory, solar radiation has been decreasing a bit, so we should have cooled slightly over the past 50 years.

[1] -

https://climate.nasa.gov/faq/14/is-the-sun-causing-global-wa...

bumby wrote at 2020-10-30 01:13:21:

Is the little hump inn temperature in the 1940s interpretable? Is it possible this is from the mass industrialization during WW2?

jeffbee wrote at 2020-10-30 01:20:13:

No, the little hump during the war is caused by the fact that before and after the war there were various groups sampling sea surface temperatures with various techniques, but during the war only the Americans kept recording these temperatures.

refurb wrote at 2020-10-30 01:10:43:

So the sun is more active but irradiance is decreasing?

keithnz wrote at 2020-10-30 01:24:21:

see the link IvyMike posted below from the same group

techload wrote at 2020-10-30 00:36:09:

From the article, at the very end:

"Whether this effect could have provided a significant contribution to the global warming of the Earth during the last century is an open question. The researchers around Sami K. Solanki stress the fact that solar activity has remained on a roughly constant (high) level since about 1980 - apart from the variations due to the 11-year cycle - while the global temperature has experienced a strong further increase during that time. On the other hand, the rather similar trends of solar activity and terrestrial temperature during the last centuries (with the notable exception of the last 20 years) indicates that the relation between the Sun and climate remains a challenge for further research."

throwaway189262 wrote at 2020-10-30 04:00:31:

It would be nuts if high solar activity spurred abundant food and thrust humanity into the electrical age. There's gotta be some big trigger why we suddenly have all this tech within 200 years after 100k years of modern humans walking about as cavemen

marsokod wrote at 2020-10-30 09:05:47:

For the trigger in the last 200 years, it is just fossile fuels. Having all this energy provides us with enough food and comfort to survive, thus lot's of spare time and spare manpower dedicated to research and improving tech. It also feeds all these machines we are making.

Going back to renewable will be tough (but is mandatory). We are a species that has been high on cocaine for a couple of centuries and we just realized that it slowly killing us, and it is running out anyway. Our only option is to sober up.

loopz wrote at 2020-10-30 04:49:52:

10000 years of unprecedented stable temperature. See Attenboroughs new documentary on Netflix!

keithnz wrote at 2020-10-30 00:49:28:

keeping in mind that was in 2004 and a bunch of further research has happened.

orwin wrote at 2020-10-30 00:42:44:

Sadly not much. The stratosphere is getting colder, while the troposphere is getting hotter, and the overall energy the earth is getting from the sun is sensibly the same. See

https://earthobservatory.nasa.gov/world-of-change/Solar

(it was a quick search)

sleepysysadmin wrote at 2020-10-30 12:18:01:

A very large portion, not all, not little.

https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Sunspo...

Notice the Modern Maximum starting around ~1800 which is also when all the graphs of global warming show increases; whereas normally the industrial revolution is blamed.

Maunder minimum ->

https://en.wikipedia.org/wiki/Little_Ice_Age

Medieval maximum ->

https://en.wikipedia.org/wiki/Medieval_Warm_Period

though our data is far less clear about that period of time.

Fundamentally, you can look at this graph.

https://en.wikipedia.org/wiki/Geologic_temperature_record#/m...

The climate warms and cools quite regularly. The Earth warmed 6 celcius over the last 20,000 years without our help.

https://en.wikipedia.org/wiki/Eemian

about 115,000 years ago it was 1-2 celcius warmer. Which is roughly what is currently being predicted as part of climate change by 2100.

pacamara619 wrote at 2020-10-30 00:56:27:

An absolutely tiny and negligible amount, almost immeasurably small.

thrill wrote at 2020-10-30 00:40:39:

According to some researchers, pretty much all of it. Take a look at the list of skeptical (and frequently demonized) scientists here:

https://thebestschools.org/features/top-climate-change-scien...

IvyMike wrote at 2020-10-30 00:51:00:

It's been about one and a half "11 year" cycles since this was published. Here's a recent paper from the same group, which covers those years:

https://www.mps.mpg.de/solar-cycle-25-has-begun?c=2169

My reading is the most recent cycle was relatively "tame" but I would love for an expert to weigh in.

breput wrote at 2020-10-30 01:24:34:

The last solar cycle was extraordinarily inactive. I'm not sure why this bubbling to the top - the title even with the (2004) is misleading.

https://en.wikipedia.org/wiki/Solar_cycle_24

glofish wrote at 2020-10-30 00:20:30:

In a related news here today:

The Laptev Sea hasn't frozen

https://news.ycombinator.com/item?id=24932466

bamboozled wrote at 2020-10-30 01:26:00:

Is this actually related?

The sea is freezing due to an anthropomorphic climate emergency, the other is more of an astronomical observation with seemingly immeasurable impact on our climate.

bergerjac wrote at 2020-10-30 00:15:12:

It's to help us see through all the liars in power.