How Can the Globe Be Warming When Most of the Southern Hemisphere Isn’t?

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New research continues to document non-warming and even “robust cooling” trends for entire regions of the Southern Hemisphere in recent decades.

Land surface temperature data compilations from the Southern Hemisphere (South America, Southwestern Andes, Tasmania, New Zealand, Australia) indicate that any warming during the 20th century occurred before 1980, with no obvious net warming since (Rezsöhazy et al., 2022).

Image Source: Rezsöhazy et al., 2022

Sea surface temperature data from the Southeastern Indian Ocean, Tasman Sea, and Great Barrier Reef region indicate no net warming since 1982 (Chapman et al., 2022).

Image Source: Chapman et al., 2022

Another new study (Xu et al., 2022) suggests the Southern Ocean (50°S–70°S) has been cooling for the last 40 years, with amplitudes ranging from -0.1°C to -0.3°C per decade in some regions.

“SST in the Southern Ocean is considered as an important indicator of climate change. This study shows that the Southern Ocean (50°S–70°S) sea surface temperature has a significant and robust cooling trend during 1982–2020”

Image Source: Xu et al., 2022

A 2021 study reported a profound cooling trend for most of Antarctica in recent decades, with amplitudes of -2.8°C for East Antarctica and -1.68°C for West Antarctica during 1979-2018.

Temperature trends in the tropics (25°N to 25°S) have been mostly flat since 1979 (Madonna et al., 2022).

Image Source: Madonna et al., 2022

About 80% of the Southern Hemisphere’s surface is water. Sea surface temperature trends for the entire Southern Hemisphere suggest no net warming from 1900-2018 (Allan and Allan, 2019).

Image Source: Allan and Allan, 2019

If most of the Southern Hemisphere has not been warming, why is it called global warming?

via NoTricksZone

By Kenneth Richard on 22. September 2022