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Related: About this forumAll The Global Temperature Graphs You'll Need, Lovingly Curated And In One Place
?w=582&h=325Climate geeks will find this elementary but not everybody is a climate geek.
Deke Arndt on Twitter:
The pretty graphic upthread is the annual global temperature anomaly (or departure) from the 20th century average. Each red dot is an individual year. Dots above the black line were warmer than the 20th century average; dots below were cooler than the 20th century average.
Pink bars are decadal average anomalies, very simply the average of the ten red dots in a decade. The most recent decade is in a different shade because its the current one, and partly it only has 9 member years. Its getting warmer, but thats not why were here right now. 3/n
Were here to look at base periods, and how they [DONT] affect things. Heres the very same data, but with pretty red circles plotted as less pretty blue and red bars. Same logic applies. You can click this here very graph in CAG: https://www.ncdc.noaa.gov/cag/global/time-series/globe/land_ocean/ytd/12/1880-2019
?w=591&h=379
The trend since 1880? 1.26 degrees Fahrenheit per century (0.70 deg Celsius). 5/n
Sometimes, this data is plotted versus the 1981-2010 average (often called normal a problematic but historically entrenched term). The red circles are lower; because theyre being compared to the warmer 1981-2010 period. But the trend is identical: 1.26 deg F / century. 6/n
The trend since 1880? 1.26 degrees Fahrenheit per century (0.70 deg Celsius). 5/n
Sometimes, this data is plotted versus the 1981-2010 average (often called normal a problematic but historically entrenched term). The red circles are lower; because theyre being compared to the warmer 1981-2010 period. But the trend is identical: 1.26 deg F / century. 6/n
?w=1024
Sometimes, people want to compare to preindustrial times. We often use 1880-1900 as an imperfect but representative proxy. The circles in this case are higher, because the comparison period is cooler, but the trend through the years is the same: 1.26 deg F / century. 7/n
EDIT
https://climatecrocks.com/2019/05/24/temperature-graphs-why-baselines-matter/
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All The Global Temperature Graphs You'll Need, Lovingly Curated And In One Place (Original Post)
hatrack
May 2019
OP
Response to hatrack (Original post)
Post removed
Bayard
(22,075 posts)2. Bookmarked to study later
IndyOp
(15,524 posts)3. The temps relative to 1981-2010 period - damn (nt)
hatrack
(59,587 posts)4. Yeah - catches one's attention, doesn't it?
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