Asymmetry of global warming. Free Technical Library News

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Global warming asymmetry

07.10.2020

New research shows that stronger nighttime warming is more common worldwide than stronger daytime warming. Scientists at the University of Exeter studied warming from 1983 to 2017 and found a difference in average annual temperature of more than 0,25°C between daytime and nighttime warming over more than half of the land surface.

Days warmed faster in some places and nights warmed faster in others, but the total area of disproportionate warming at night was twice that.

The "warming asymmetry" was mainly due to changes in cloud levels. Increased cloud cover cools the surface during the day and retains heat at night, resulting in even more warming at night.

"Warming asymmetries could have major implications for the natural world," said lead author Dr Daniel Cox of the Institute for Environment and Sustainability at Exeter's Penryn campus in Cornwall.

Stronger nighttime warming is associated with a wetter climate, and this has been shown to have important implications for plant growth and how species such as insects and mammals interact.

Greater diurnal warming is associated with drier conditions coupled with higher levels of overall warming, which increases species vulnerability to heat stress and dehydration.

"Species that are active only at night or during the day will be especially affected," the scientists say.

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