why have the jet streams moved north because of global warming?
http://ossfoundation.us/projects/environment/global-warming/latitudinal-shift
The movement of jet streams, particularly toward higher latitudes, is believed to be influenced by global warming. Jet streams are fast-flowing, narrow air currents in the upper atmosphere that play a significant role in weather patterns. The main reasons why jet streams have shifted poleward due to global warming are:
1. Temperature gradient changes: Global warming leads to uneven heating of the Earth's surface. The polar regions warm faster than the tropics, reducing the temperature difference between them. The jet streams typically form at the boundary between these two regions, and their position is determined by this temperature gradient. As the gradient diminishes, the jet streams tend to migrate northward.
2. Polar amplification: The phenomenon known as polar amplification is a consequence of global warming. As greenhouse gases trap more heat in the atmosphere, the polar regions experience higher warming rates compared to the rest of the planet. This amplification alters atmospheric pressure patterns, causing a northward shift of the jet streams.
It's important to note that the relationship between global warming and the movement of jet streams is still an area of active research. Scientists are studying this complex phenomenon using climate models and observational data to better understand how human-induced climate change affects the behavior of jet streams.
To learn more about the specifics and latest research on this topic, you can refer to scientific papers, reports from reputable research institutions, or news articles from trusted sources. Staying up-to-date with scientific literature will provide you with a deeper understanding of the subject.