How rising air plumes help spike moist heat
As climate change has led to more frequent extreme-heat events around the world, moist heat metrics such as wet-bulb temperature, which combines temperature and humidity, have become increasingly relevant. Days with both high heat and high humidity are dangerous to human health; understanding how these extreme events will change in the future is important.
Rising air plumes, also known as convective environments, are playing a significant role in increasing moist heat extremes worldwide. This phenomenon occurs when dry air mixes into warm, moist air columns rising from near Earth's surface to the upper troposphere. Scientists R. Jha and M. P. Byrne studied this process using data from ERA5 reanalysis and the Community Earth System Model Version 2.
They discovered that this entrainment significantly impacts the relationship between stored energy in near-surface air and higher-altitude air in the troposphere. As the climate warms and dries the lower troposphere, this mechanism intensifies near-surface temperature and humidity, leading to more severe moist heat events. The authors predict that as global temperatures continue to rise, the entrainment mechanism will further increase wet-bulb temperatures at the surface, potentially causing even more hazardous moist heat events.
This research was published in Geophysical Research Letters and highlights the importance of understanding these processes as climate change progresses.
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