NOAA's Center for Operational Oceanographic Products and Services uses advanced acoustic and electronic equipment to measure and monitor the tides along our coasts. If there is a tree or other obstruction in the pond, the ring of waves would travel and wrap around it. Think of the wave or bulge that you see when you throw a rock into a pond. The lag can be hours or even close to an entire day in some parts of the world. East (known as the continental rise, continental slope, and continental shelf) slows down the tidal "bulge" or "wave" of water. For example, the rising slope of the ocean floor approaching the U.S. There are lags in time when an observer experiences high or low tide, and the lag varies from one location to another. All of these factors play into the height of the tides.Īnother thing to consider when thinking about tides is the dimension of time. At the same time, the depth of the world ocean varies greatly. Areas where the Earth’s surface is higher, such as mountains, have a stronger gravitational force than do places where the surface is lower, such as a valley or cavern. It is also dotted with large land masses (continents). The Earth is not a true sphere, but bulges slightly at the Equator. The tidal "bulge" would move around the Earth with the moon, but this is not the case with our planet. If Earth was a true sphere covered by an ocean of constant depth, then it would be true that a high tide event would occur at the location with the moon overhead. The shape of our planet has a lot to do with differences in gravitational pull at various locations. Many of them have to do with the geography and shape of the Earth. Other forces, more regional than the moon or sun, control the tides. However, these gravitational forces do not control when high or low tide events occur.
Thanks to Sir Isaac Newton’s 1687 discovery, we know that tides are very long-period waves that move through the ocean in response to forces exerted by the moon and sun. Tides originate in the ocean and progress toward the coastlines, where they appear as the regular rise and fall of the sea surface.
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