Researchers find bottom of Pacific getting colder, possibly due to Little Ice Age
Earth's climate cooled considerably across the transition from the Medieval Warm Period to the Little Ice Age about 700 years ago. Theoretically, owing to how the ocean circulates, this cooling should be recorded in Pacific deep-ocean temperatures, where water that was on the surface then is found today. Gebbie and Huybers used an ocean circulation model and observations from both the end of the 19th century and the end of the 20th century to detect and quantify this trend. The ongoing deep Pacific is cooling, which revises Earth's overall heat budget since 1750 downward by 35%.
The model showed that the Pacific Ocean cooled over the course of the 20th century at depths of 1.8 to 2.6 kilometers. The amount is still not precise, but the researchers suggest it is most likely between 0.02 and 0.08° C. That cooling, the researchers suggest, is likely due to the Little Ice Age, which ran from approximately 1300 until approximately 1870. Prior to that, there was a time known as the Medieval Warm Period, which had caused the deep waters of the Pacific to warm just prior to the cooling it is now experiencing.
Read more: https://phys.org/news/2019-01-bottom-pa ... y-due.html
https://www.mnn.com/earth-matters/clima ... -be-solved
^So what happens when warm surfaces finally reach the bottom?
Pacific Depths Likely to Keep Warming for Centuries Even if We Decarbonize Now, Study Shows
The slow-circulating deep Pacific is still cooling almost 200 years after the Little Ice Age ended, with worrying implications for the anthropogenic age
There is also no question that anthropogenic climate change is warming ocean surfaces and even the groundwater.
Because of how water circulates in the vast oceans, the oceanographers had suspected that temperature anomalies like the Little Ice Age might leave long-term traces in the overturning deep Pacific. The still-cooling water they have observed is just such a “memory,” they believe.
Their paper presents a model of the behavior of the “creeping waters,” not categorical facts. But they’re confident in it and if they’re right, one implication of their model is that even if we suddenly decarbonize and stop changing the climate, we could be contending with the depths of the Pacific Ocean continuing to warm at least for decades, possibly hundreds of years.
Read more: https://www.haaretz.com/science-and-hea ... -1.6809721
Melting ice sheets release tons of methane into the atmosphere
The Greenland Ice Sheet emits tons of methane according to a new study, showing that subglacial biological activity impacts the atmosphere far more than previously thought.
Read more: https://www.sciencedaily.com/releases/2 ... 110300.htm
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