Antarctic meltwater could dramatically slow overturning current

[jc456]

That doesn't answer the question. When you complain about scientific studies using modal verbs (must, shall, will, should, would, can, could, may, and might) you are exposing your ignorance. You may have read me here noting that there are no proofs in the natural sciences. Without proofs, scientists are forced to use modal verbs. Surely you've noted that scientific theories are always subject to revision. Do you not see the connection? If a scientist could prove the cause of some event in natural science, they would use have, be and do, the non-modal auxiliary verbs, But then, their findings would not be subject to revision.

Sich versteht?

Using words like could should might is guessing. There’s no guessing in science! There’s theory, I really wish you COULD learn science

 

[jc456]

Also, du versteht es nicht

You don’t

 

[ding]

Just as fresh melt water in the Arctic is weakening the Atlantic Meridional Overturning Current (AMOC), Antarctic meltwater threatens the Antarctic Bottom Water (AABW) current. The globes various meridional overturning currents are responsible for an enormous amount of the nutrients and oxygen in the equatorial ocean and for transfer of cold water from the poles to the tropics. Their collapse would result in heating of the tropical oceans and loss of dissolved oxygen on which all marine animal life depends. Historically, these systems are very slow to respond and recover and these effects could last for centuries.

ABSTRACT
The abyssal ocean circulation is a key component of the global meridional overturning circulation, cycling heat, carbon, oxygen and nutrients throughout the world ocean1,2. The strongest historical trend observed in the abyssal ocean is warming at high southern latitudes2–4, yet it is unclear what processes have driven this warming, and whether this warming is linked to a slowdown in the ocean’s overturning circulation. Furthermore, attributing change to specific drivers is difficult owing to limited measurements, and because coupled climate models exhibit biases in the region5–7. In addition, future change remains uncertain, with the latest coordinated climate model projections not accounting for dynamic ice-sheet melt. Here we use a transient forced high-resolution coupled ocean–sea-ice model to show that under a high-emissions scenario, abyssal warming is set to accelerate over the next 30 years. We find that meltwater input around Antarctica drives a contraction of Antarctic Bottom Water (AABW), opening a pathway that allows warm Circumpolar Deep Water greater access to the continental shelf. The reduction in AABW formation results in warming and ageing of the abyssal ocean, consistent with recent measurements. In contrast, projected wind and thermal forcing has little impact on the properties, age and volume of AABW. These results highlight the critical importance of Antarctic meltwater in setting the abyssal ocean overturning, with implications for global ocean biogeochemistry and climate that could last for centuries.

Open access - no paywall

https://www.nature.com/articles/s41586-023-05762-w.epdf?sharing_token=-Uv6ck382-4igdiSTULUQ9RgN0jAjWel9jnR3ZoTv0N6Cb4xcqVX2aG3Xn7Rj30THD8-VYClPJdSBkh1jXIAyxhb-WZcGKeC9oHk4_wkXETW5fyBQkboXNYJL-39MFoNfPGCWylxhJ38AzatVN5gAKz_Aeg0xzKD_0FbFgJUECgSzld0tpjjd6oBaGLKPG3f5mw6EiiMddhZZzw5qTnDaQ%3D%3D&tracking_referrer=www.cnn.com

Wouldn't this have happened in the other 30 or so glacial cycles over the past 3 million years? In other words, it is temperature related, right? And the same thing would have been temperature related for the last 30 or so cycles?