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Hi I just found the NOAA table. It clearly shows that the N. hemisphere has warmed much more than the southern hemisphere since 1880!

enter image description here https://www.ncei.noaa.gov/access/monitoring/monthly-report/global/202113

What could be the reason for this? My idea is that the N. hemisphere has accumulated significantly more continental mass, while the S. hemisphere is almost continent-free. And the water is warming because the Gulf Stream is currently flushing more warm water northwards. Is my idea correct? Do you have other suggestions or are there suitable papers?

Weiss
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    this may be helpful, https://www.jstage.jst.go.jp/article/sesj/26/4/26_374/_pdf#:~:text=e%20atmospheric%20carbon%20dioxide%20(CO2,understanding%20of%20the%20carbon%20cycle. – John Jul 24 '22 at 19:54
  • @Hexenbrei, thanks for your bounty! – Weiss Aug 13 '22 at 10:15
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    Consider that there a a lot more land in the northern hemisphere and land usage change is a contributor. – John Aug 14 '22 at 01:30
  • One small comment, the Gulf Stream is in fact likely slowing down, so less warm water will be moving northward. https://www.severe-weather.eu/global-weather/gulf-stream-amoc-circulation-collapse-freshwater-imbalance-usa-europe-fa/ – arkaia Aug 14 '22 at 02:19
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    This Question is very interesting, my theory for the cause is that, Yes your theory applies to, with less/more landmass on either hemisphere, but I also believe land usage and the prevelance of factories and other factors can play a role in pumping more greenhouse gases into the atmosphere, many cities are located in Europe/Russia/US etc. Currents would also play a role. I'm not sure if this combination of factors would lead to a definitive answer. – Tardy Aug 16 '22 at 14:56
  • Plenty of 'reasons' if you Google https://www.google.com/search?q=warming+northern+southern+hemisphere, but it takes further reading to get actual numbers. I don't have time to dig into all that and write an answer. – Jan Doggen Aug 17 '22 at 07:28
  • The difference between Northern and Southern Hemispheres in air pollution levels (which tend to "mask" warming trends), and their subsequent reduction in recent decades (which respectively "unmask" the actual levels of greenhouse warming) may also play a role. See e.g. Figure 4 in https://wires.onlinelibrary.wiley.com/doi/10.1002/wcc.372 – Pat Aug 27 '22 at 15:31

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The Northern Hemisphere is warmer than the Southern Hemisphere in part because of northward cross-equatorial ocean heat transport. http://ocp.ldeo.columbia.edu/res/div/ocp/pub/seager/Kang_Seager_subm.pdf

It is considered that the northern hemisphere has more land mass while the southern hemisphere has more ocean and therefore varies in the rate of warming. https://atmosphere.copernicus.eu/carbon-dioxide-levels-are-rising-it-really-simple

Daria Blackwell
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