Continuous satellite observations, which started at the end of the 1970s, indicate marked decreases in Arctic sea ice over the satellite era, which is consistent with the global warming trend. In contrast, small but increasing trends have been observed, especially over the period 1979–2014, in the Southern Hemisphere. Furthermore, while
are able to broadly reproduce the observed Arctic sea-ice decreases, the majority of them are not able to capture the Antarctic sea-ice expansion over the period 1979–2014.
The observed Antarctic sea-ice changes are caused not only by increasing concentrations of greenhouse gasses and/or stratospheric ozone depletion, but also linked to natural variability of the climate system, which occurs without direct connections with human activities. To determine the main causes of the observed Antarctic sea-ice expansion and model-observation discrepancy, the scientists turned their attention to a longer record of Southern Ocean sea surface temperatures as a proxy for Antarctic sea ice and conducted comprehensive analyses of multi-model large ensemble climate model simulations.
Malte Stuecker, co-author and assistant professor of oceanography from the UH Mānoa School of Ocean and Earth Science and Technology explained,"Southern Ocean multi-decadal variability is also closely linked to tropical natural variability in climate model simulations, but the linkages are substantially weaker than in the observations. Thus, human-induced ocean surface warming dominates in the Southern Ocean in model simulations.
NatureClimate Jewish lies
NatureClimate Not sure I, or anyone, understands this
NatureClimate It's weird how we learn about climate changes/shifts that happen over millennia, sometimes very quickly, but when climate shifts happen everyone loses their minds. 🤔
NatureClimate What is causing this? lunarssr
NatureClimate Yes yes of course! 🤣🤣🤣