Credit: The Weather Network
To what extent can ground conditions affect the weather, rather than the other way round? This study claims to have found something new, saying: ‘Since 2000, frequent “stuck” weather patterns have produced heat waves over Greenland, resulting in exceptional melting of the Greenland Ice Sheet’ – which begs the question: What started, or stopped, happening in or around 2000 to cause such patterns? The answer given is: ‘Observations have revealed a more prevalent negative phase of the North Atlantic Oscillation (NAO)’. In other words, a natural phenomenon. Getting to the bottom of what the paper says depends partly on interpreting what they mean by statements like this: ‘One question is whether this is a consequence of climate change.’
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Jet streams are relatively narrow bands of strong wind in the upper atmosphere, typically occurring around 30,000 feet, and blowing west to east, says Phys.org
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