7/3/2023 0 Comments East boundary![]() ![]() Listing Courtesy of Berkshire Hathaway HomeServices Homesale Realtyīased on information from one of the following Multiple Listing Services: BRIGHT, Greator Scranton Board of REALTORS®. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. For example, the Kuroshio Current in the western Pacific is around 15 times faster, 20 times narrower, and 5 times deeper than the California Current in the eastern Pacific.No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of descriptions or measurements (including square footage measurements and property condition), such should be independently verified, and Compass expressly disclaims any liability in connection therewith. In the same way, western boundary currents are not only faster, but also deeper than eastern boundary currents, as they move the same volume through a narrower space. The same amount of water is exiting the hose whether the opening is covered or uncovered, but to get that water through the covered opening the flow has to be much faster and stronger. You can make the water flow from the hose much faster and more strongly by covering part of the opening with your thumb. A simple analogy is the water flowing from a garden hose. On the eastern side of the gyre the current is much wider, so the flow is slower. In the western gyre currents, that volume is passing through a narrower area, so the current must travel faster in order to transport the same amount of water in the same amount of time. The same volume of water must pass through both the east and west sides of the gyre. The center of rotation of the gyre is also closer to the western side of the gyre (blue dots) (PW). To move the same volume of water through each side, western boundary currents are faster, deeper, and narrower than eastern boundary currents. In both hemispheres, currents on the western side of the gyres travel through a much narrower area than the currents on the eastern side (yellow rectangles). This imbalance means that the center of rotation of the gyre is not in the center of the ocean basins, but it closer to the western side of the gyre. These western currents must therefore move through a much narrower area (Figure 9.4.1). Near the equator, the westward flowing currents experience a much weaker Coriolis force, so their deflection does not happen until the current is all the way over to the western side of the ocean basin. The currents on the eastern side of the gyre are therefore spread out over a wide area as they move towards the equator (Figure 9.4.1). ![]() As the currents move eastward, the strong Coriolis force begins to deflect the currents towards the equator relatively early. The high latitude surface currents of the major gyres experience a strong Coriolis force due to their proximity to the poles. Thus the speed of Earth’s rotation changes more quickly with latitude near the poles than at the equator, making the Coriolis force strongest near the poles and weakest at the equator. ![]() Therefore there is an 800 km/hr difference between 60 o and 90 o latitude, while there is only a 200 km/hr difference between the equator and 30 o. The speed increases to about 800 km/hr at 60 o latitude, 1400 km/hr at 30 o latitude, and 1600 km/hr at the equator. At the poles, the speed of rotation is 0 km/hr. The greater the change in rotation speed, the stronger the Coriolis force. This phenomenon is known as western intensification, and once again it is due to the Coriolis Effect.Īs discussed in section 8.2, the Coriolis Effect is a result of the fact that different latitudes of the Earth are rotating at different speeds, and the apparent path taken by an object is deflected as it moves between areas of different rotation speeds. In other words, the currents off of the east coast of the continents are more intense than currents off of the west coast of the continents. In both hemispheres, the currents making up the western side of the gyre are much more intense than the currents on the eastern side. ![]()
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