Anthony Watts states that sea level rise is minimal (according to NOAA, around 1.7 mm per year)
That’s about 7 inches per century.
True, BUT............
On the east coast of the US it is rising MUCH faster, due to the slowing of the Gulf Stream.
The Gulf Stream has known measured to be slowing down significantly, perhaps due to Global Warming. When the Gulf Stream flows north rapidly, the Coriolis force causes the sea level to slope downward from east to west. So the water level on the coastline is lower than if the the Gulf Stream didn’t flow. As the Gulf Stream slows down, that slope will get less, and the water levels on the coast will rise.
This webpage is balderdash in so many ways!
"Our intuition, based on seeing water that is moving too quickly to be affected by the Coriolis force"
Too quickly? The Gulf Steam moves an average of about 4 mph. Artillery Fire Direction Controllers have to factor in the Coriolis Effect when aiming at a target. This is most pronounced when firing directly North or South. IIRC, this is adjusted by multiplying this effect by the cosine of the angle between the direction of fire and due North or South.
Artillery shell velocity - varies, but up to one mile per second or more
Gulf Stream "moving too quickly" - 4 miles per hour
True, BUT............
On the east coast of the US it is rising MUCH faster, due to the slowing of the Gulf Stream.
The Gulf Stream has known measured to be slowing down significantly, perhaps due to Global Warming. When the Gulf Stream flows north rapidly, the Coriolis force causes the sea level to slope downward from east to west. So the water level on the coastline is lower than if the the Gulf Stream didn't flow. As the Gulf Stream slows down, that slope will get less, and the water levels on the coast will rise.
No, no. Not correct in general, nor in specifics.
1. There is no slowing” of the Gulf Stream - that effects the speed, the “height” of the sea water off of the US east coast, nor the future circulation of the Gukd Stream. (Yes, “what if” projections claim those effects, but, like those projecting a melt of the Greenland ice cap, those exagerate today's rates, then project them 10,000 years into the future. (About the time of the next glaciers will be scraping Chicago flat under 3000 feet of ice.)
2. Several ISOLATED sections of the east coast are going down faster than the average east coast block of the North American continent. Others such as the entire region around Hudson Bay, are rising faster than the average due to the loss of ice mass over them. So, as the northern Canadian rise, their southern region tilts “down” -which includes the southern edge of New York, most famously the south tip of Manhattan.
Other local regions such as Virginia's Tidewater, are going down due to ground water being pumped out. (Pump out ground water anywhere around the world, then the surface goes down - in Baytown TX in the late 60’s, as much as 6-8 feet. Pump water back in (as they did in TX), and the streets and houses go back up above ground. Happens worldwide too: Taiwan, Philippines, Japan, and Europe. Dozens of examples of bad ground water management exist.
(Seems like coastal cities would learn. In FL, pumping ground water doesn't change relative ocean level at the shore, but does change the underground salt water/freshwater salinity levels. Again, you'd think they would learn.)
3. The south tip of Manhattan is going down faster than the average for the entire North American continent at About 3.1 mm per year.
The actual measured global average sea level rise remains constant since reliable, repeatable accurate measurements started in the 1920’s. Global average sea level rise of 2.3-2.4 mm/year = 1 inch in a decade, 10 inches in a century. At Manhattan's tip, it is a bit faster than that: 31 mm per decade (1-1/4 inch decade, 12 inches per century.)
4. There is NO "rise" in the Atlantic Ocean anywhere due to the circular motion of the Gulf Stream (100 - 300 km across) flowing at the slow rate it is actually moving.