Abnormal beyond model warming; One big reason: Slower moving circulation caused by vanishing thinning Arctic sea ice

 ~Interesting article by GSC Gavin Schmidt, a must read:  https://www.nytimes.com/2024/11/13/opinion/climate-change-heat-planet.html

~Most can be indirectly understood if you read my latest of many similar yearly April climate Projections for the summer fall:

https://eh2r.blogspot.com/2024/04/2024-summer-fall-projection-forecast.html

The reason why the warming is greater for the Northern Hemisphere is simple, Arctic sea ice reduction in area and thickness surrounded by continents.  For this we must look at NASA GISS:

                  Annual mean Land-Ocean Temperature Index in 0.01 degrees Celsius
                                      selected zonal means
                                      --------------------
                    sources:  GHCN-v4 1880-10/2024 + SST: ERSST v5 1880-10/2024
                    using elimination of outliers and homogeneity adjustment 

                         Note: ***** = missing - base period: 1951-1980  

                           24N   24S   90S     64N   44N   24N   EQU   24S   44S   64S   90S
Year  Glob  NHem  SHem    -90N  -24N  -24S    -90N  -64N  -44N  -24N  -EQU  -24S  -44S  -64S Year
2021    85   114    55     143    65    53     206   136   127    72    58    72    33    30 2021
2022    89   116    62     152    56    70     235   150   127    62    51    78    40   108 2022
2023   117   150    85     178   106    71     258   187   147   108   105    90    45    62 2023
Year  Glob  NHem  SHem     24N   24S   90S     64N   44N   24N   EQU   24S   44S   64S   90S Year
                          -90N  -24N  -24S    -90N  -64N  -44N  -24N  -EQU  -24S  -44S  -64S
 The zonal mean 64-90 North and South says it all.  There is a continent wide Glacier at the South Pole, while at the North Pole there is a continent size Ocean covered by sea ice.  If this sea ice vanishes,   something likely to happen during a coming summer, temperatures at North Pole Region would warm much more.  At the moment, the warming is gradual but close to 4 times faster compared to the Antarctic.
    A slowing of global circulation is a symptom of massive temperature differentiation from one temperature zone to the next,  as the Arctic sea ice disappears so will the Northern Hemisphere swift weather events usually lasting a day or so, temperatures between the North Pole and Equator will be significantly less, engendering slow to sluggish circulations causing catastrophic events to linger, such as Typhoon/Hurricanes moving slowly over a populated area, as already happened.  Causing entire regions languishing under same weather conditions for days or much longer,  such as excessive droughts, never ending heavy rain periods as has happening more recently again.  
   July peak record breaking temperatures way above climate model projections (NYtimes article) is an indication confirming that Northern Hemisphere is warming faster than the South, largely tempered by massive Oceans and said huge Antarctic Glacier.  There is ample evidence of Arctic sea ice changes, suffices to say, its state is nowhere similar compared with a mere 20 years ago.  Especially autumn and winter ice topography, recently more broken and with open water, along with the warmed Oceans have caused our present delay of onset of winter worldwide.  WD December 1 2024