Globally, Summers Heating Up Faster Than Other Seasons, Particularly In N. American Farm Belt
Summers are heating up faster than the other seasons as global temperatures rise, especially in parts of the Northern Hemisphere, and the changes carry the clear fingerprints of human-caused climate change, a new study shows.
The findings deliver another blow against two refrains commonly repeated by climate deniers: that the satellite record doesn't show that the planet is warming, and that it's impossible to know how much warming is from nature and how much is from human beings.
Both claims are wrong, say the authors of the study, published Thursday in the journal Science. Opponents to climate action have pointed to satellites in their arguments against global warming, said lead author Benjamin Santer, a climate researcher at Lawrence Livermore National Laboratory. "But in fact, satellite temperature data show very strong signals of human effects on climate."
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Santer and his team found that at the mid-latitudes in the Northern Hemisphere, from about 40° North (close to the Kansas-Nebraska border) to about 60° North (mid-Canada), there is a gap between how much temperatures are rising in summer compared to how much they are rising in winter. That gap grew by roughly a tenth of a degrees Celsius each decade over the 38-year satellite record as the summers warmed faster. The reason for this, the study explains, is that much of the world's land is in the Northern Hemisphere, as opposed to the Southern Hemisphere, which has more ocean. Ocean temperatures don't fluctuate as much and are slower to reflect change.
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https://insideclimatenews.org/news/19072018/global-warming-evidence-summer-record-temperatures-crops-agriculture-climate-change-data
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