Paradoxically, the most intense wildfires can have the opposite effect on temperatures, cooling Earth’s surface both regionally and globally
, scientists have measured this effect by comparing temperatures on heavy smoke days with temperatures forecast to have occurred in its absence.
Field describes these cooling effects as “episodic” and “almost an academic curiosity” compared with the public health impacts of wildfire smoke. Buton Australia’s 2019-2020 bushfire season points to another, potentially far more significant, way that wildfire smoke can cool Earth’s surface. Smoke particles act as seeds for water vapor to form droplets, resulting in clouds with additional droplets of water that are smaller and reflect more sunlight. While smoke tends to rain out of clouds fairly quickly, the Australian bushfires raged for months, pumping more and more cloud-brightening smoke into the atmosphere.
France Dernières Nouvelles, France Actualités
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