According to The New York Times:
Scientists have used data from the system to understand how the ocean is absorbing greenhouse gases from the atmosphere, how changes in ocean temperature such as marine heat waves might affect fisheries or signal bigger shifts in the climate, and coastal flooding along the East Coast.
The station in the Irminger Sea has been key to understanding changes in the Atlantic Meridional Overturning Current, a global conveyor belt of water that some scientists are concerned may be weakening as a result of climate warming. A collapse of the current could have severe weather effects.
[....]
Craig McLean, who was the acting chief scientist at the National Oceanic and Atmospheric Administration during the first Trump term, said the move was part of a pattern in the Trump administration.
“This reflects the further lack of understanding that the current administration has of scientific value and scientific merit,” Dr. McLean said. “By dismantling such a system, we push the United States back yet again into a rear seat in global scientific leadership.” [color emphasis added]
Trump is indebted to the fossil fuel industry for their 2024 election support, so he is doing everything he can to dismantle climate science, regardless of the damage it will do to the planet.
It's like with COVID, when Trump said, “If we stopped testing right now, we’d have very few cases, if any.”
The problem is that even if Trump doesn't allow scientists in this country to measure changes in ocean temperature, it won't stop climate change from happening--it will just stop the US from being able to more accurately predict climate changes, and to be better prepared for them.