How does this relate to agriculture?
Changes in the Hadley cell and Walker circulation can result in dramatic climate variations for many regions. In an El NiÃ±o winter, for example, the presence of the warm water in the eastern Pacific shifts the position of the subtropical jet, leading to heavy rainfall in Florida and southern Georgia. You can learn more about how El NiÃ±o and its opposite, La NiÃ±a, affects the weather in the Southeast at www.agroclimate.org, which allows you to look at differences in climate in different years depending on the El NiÃ±o phase.
In a warming climate, the Hadley cell could increase in length and alter the climate of regions around 30Â°. For example, many deserts in the northern hemisphere are located around the 30Â° latitude, and if the Hadley cell were to increase in length, that could cause dry conditions to move north of 30Â°. Ultimately, this would alter the precipitation patterns of many regions, including the Southeast.