A study found that dust from snow- and ice-free areas of the Arctic could be an important contributor to climate change in the region. Higher levels of dust help promote the formation of ice crystals in the clouds, which weakens the efficiency of clouds to contain more liquid droplets and fewer ice crystals by Arctic warming.
The Arctic is warming two to four times faster than the global average. A recent study by researchers in Japan found that dust from snow- and ice-free areas of the Arctic may be an important contributor to climate change in the region. The findings were published in the journalAccording to one view, higher temperatures in the Arctic are thought to lead to the region's clouds containing more liquid droplets and fewer ice crystals.
"Increasing amounts of dust due to Arctic warming may cause the opposite phenomenon of the conventional understanding of ice crystal changes," said Associate Professor Hitoshi Matsui of Nagoya University, the lead author of the study.
They first looked at changes in the amount of dust released from the Arctic land surface over the past 40 years, between 1981 and 2020. The simulations showed that dust emissions increased by 20% during this period as the Arctic warmed. This increase promotes ice nucleation in clouds in the lower troposphere, weakening the efficiency of clouds to contain more liquid droplets and fewer ice crystals as the Arctic warms.
Scientists in Japan have used a global climate model to show that dust from land without snow cover in the Arctic is a major source of particles that form ice crystals in Arctic low-level clouds. ...
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