To the Poles: How Storms Will Veer in a Warmer World
Prof. Yohai Kaspi of the Institute’s Earth and Planetary Sciences Department explains that the Earth’s climatic zones roughly follow latitudinal bands. Storms mostly move around the globe in preferred regions called “storm tracks,” forming over the ocean and generally traveling eastward and somewhat poleward along these paths. Thus, a storm that forms in the Atlantic off the East Coast of the US at a latitude of around 40N will reach Europe in the region of latitude 50N. Until recently, however, this inclination to move in the direction of the nearest pole was not really understood. Dr. Talia Tamarin in Kaspi’s group solved this fundamental question in her doctoral research.
Credit: Google earth
In the present study, to understand how the movement of storms may change in a warmer world, Tamarin and Kaspi applied the same method to full-complexity simulations of climate change predictions. Their analysis showed that the tendency of storm tracks to veer in the direction of the poles intensifies in warmer conditions. They discovered that two processes are responsible for this phenomenon. One is connected to the vertical structure and circulation near the tops of these weather systems. A certain type of flow that is necessary for them to grow also steers the storms toward the pole, and these flows are expected to become stronger when average temperatures rise.
The second process is connected to the energy tied up in the water vapor in such storms. In global warming, the hotter air will contain more water vapor, and thus more energy will be released when the vapor condenses to drops. “The hottest, wettest air is circulating up the eastern flank of the storm – to the northern side – and releasing energy there,” says Tamarin. “This process pushes the storm northward (or southward in the southern hemisphere), and this effect will also be stronger in a warmer climate.”
The models of climate change predict that if average global temperatures rise by four degrees over the next 100 years, storms will deviate poleward from their present tracks by two degrees of latitude. The research performed at the Weizmann Institute of Science shows that part of this will be due to the mechanism they demonstrated, and the other part is tied to the fact that storms are born at a higher latitude in a warmer world. “The model Talia developed gives us both qualitative information on the mechanisms that steer storms toward the poles and quantitative means to predict how these will change in the future,” says Kaspi. “Although two degrees may not sound like a lot, the resulting deviation in temperature and rain patterns will have a significant effect on climate zones,” he adds.
Source: http://www.ineffableisland.com/2017/11/to-poles-how-storms-will-veer-in-warmer.html
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