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A graph that should be front-page news

lyrebirddreaming.com

11–20 of 469 posts

Re: A graph that should be front-page news

#11

Shouldn't the y-axis better be called "Standard DeviationS"? According to one comment on the site, the 3.5 means "3.5 times the SD", which makes much more sense to me. I initially tried to make sense of "SD being 3.5 on that day of the year", which seems to be a wrong interpretation.

No. The (standard) deviation is 3.5.

Re: A graph that should be front-page news

#12
post #9
post #3

Looking at the graph left me wondering just what it means exactly. I'm not well versed in statistics so "the standard deviation is 3.5°C" doesn't mean much. Also, what's up with that other line going down to -3.5°C? And what do the colors mean? In the sense that I'm not sure whether a darker blue means closer to or further from today.

You can go to the source website https://climatereanalyzer.org/clim/sst_daily/?dm_id=nino3.4 There's is an interactive chart that's easier to understand

Check out 2015, it had way hotter temperatures in November, with higher temperatures than the average in this period, but I would like a climatologist to explain this, draw correlations etc. The original post is a weird LLM-mediated mix of vague scaremongering with some easy piling on journalism "just because". So what am I supposed to with it? Nothing, because it's written by an LLM, I guess.

Re: A graph that should be front-page news

#13
post #9
post #3

Looking at the graph left me wondering just what it means exactly. I'm not well versed in statistics so "the standard deviation is 3.5°C" doesn't mean much. Also, what's up with that other line going down to -3.5°C? And what do the colors mean? In the sense that I'm not sure whether a darker blue means closer to or further from today.

You can go to the source website https://climatereanalyzer.org/clim/sst_daily/?dm_id=nino3.4 There's is an interactive chart that's easier to understand

Thanks for posting that link.

The graph has a key on the right hand side that clearly labels each colour of line, and the horizontal axis is scaled in months of each year. Scrolling down gets you notes and links to data sources.

In answer to another poster in this thread, the dataset only reaches back to 1983, I'm assuming because that is when they started monitoring these temperatures?

Re: A graph that should be front-page news

#15
post #3

Looking at the graph left me wondering just what it means exactly. I'm not well versed in statistics so "the standard deviation is 3.5°C" doesn't mean much. Also, what's up with that other line going down to -3.5°C? And what do the colors mean? In the sense that I'm not sure whether a darker blue means closer to or further from today.

I had the same concerns and think the chart would benefit from color grading the individual years by age. If the other outlier in the opposite direction is equally likely then it should also be concerning (obviously it is not). My understanding is the deviation is from the 1991-2020 subset avg, so a warming trend would be indicated by relative drift towards positive in the std dev across years from 82-present

Re: A graph that should be front-page news

#16
post #7
post #3

Looking at the graph left me wondering just what it means exactly. I'm not well versed in statistics so "the standard deviation is 3.5°C" doesn't mean much. Also, what's up with that other line going down to -3.5°C? And what do the colors mean? In the sense that I'm not sure whether a darker blue means closer to or further from today.

I'm not an authority on this, but here's is my understanding - I'd appreciate if someone could correct my mistakes. The baseline of 0.0 represents the average of all years. Anything above / below the baseline is a (standard) deviation from the average. The blue lines are the individual years since 1991 [1] while the red line is the year 2026. If a line is above the baseline, then the sea-surface temperature was hotte…

I think it is the other way around: SD is calculated from 1982-2020, while all measurement readings in the plot are 1982-2026. I believe this is meant to not introduce an unwanted shift but compare to sort of a 'stable process'. However, that should have been described and argued somewhere.

Re: A graph that should be front-page news

#20

There are many thing people could do, eat less meat, smaller homes, electric cars, green energy, no flights etc. but the vast majority of people does exactly nothing.

> eat less meat, smaller homes, electric cars, green energy, no flights etc.

How much % of the world's population would have to do those things, for the graph to show a reversal of the trend? 10%? 50%? Everyone?

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