Just curious, is there any mention anywhere in the paper for the theory of natural cyclic variations verses the supposed contributions by modern man?
Secondly, how could anyone know what these fossilized creatures "preferred" in terms of their environment before internment? Could these fossilized creatures have not simply and naturally adapted to their environments before fossilization?
What we have here is supposition based upon prior supposition - ad infinitum. I.e., they are assuming one theory supports another theory higher up the hypothetical chain when no single theory in the chain can stand on its own.
The basic conclusion of both studies is that the Atlantic current system is the weakest it has been during the studied periods. One focuses on improving the accuracy of climate models as they relate to the currents and observed sea surface temperatures. The other asserts that the current slowdown needs to be understood better.
The Caesar article talks about sediment grain size and three specific organisms they looked for. I think I'm getting an abbreviated version of the article, so I haven't found a detailed explanation of
why they looked for those specific organisms. Perhaps the writer for
Scientific American had a more complete version of the article, considering what they said about creatures thriving in colder or warmer conditions in the quoted paragraph.
For me, the SA article was helpful in explaining the Atlantic current system. In layman's terms, it compared the two articles, their common findings, and their differences. The overall tone, in the SA article and the studies, is one of trying to accurately understand the factors that affect those currents and in turn, the effects of the currents changing--on things like sea level, lobster and cod fisheries, and the location of the tropical rain band. The scientific papers are more than I really want to study further on a Saturday night, but I just read both fairly quickly. Links to the abstracts are supplied below in case you have journal access through a library.
Scientific American 2018
https://www.scientificamerican.com/...antics-circulation-is-weakest-in-1-600-years/
2018 Papers, abstracts only without a subscription
https://www.nature.com/articles/s41586-018-0007-4 (Mostly about improving climate model accuracy)
https://www.nature.com/articles/s41586-018-0006-5 (Mentions the ocean core samples)
2021 article that must have started this thread
https://www.nature.com/articles/s41561-021-00699-z