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FRIDAY, JULY 11, 2025
Satellites reveal how forests increase cloud, cool climate

Environment

UNB
08 August, 2021, 09:00 am
Last modified: 08 August, 2021, 09:00 am

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Satellites reveal how forests increase cloud, cool climate

The paper describes how cloud generally increased over the whole year in afforested areas in temperate, tropical and arid regions, sometimes by as much as 15%

UNB
08 August, 2021, 09:00 am
Last modified: 08 August, 2021, 09:00 am
Satellites reveal how forests increase cloud, cool climate

A first global assessment using satellite observations has shown that for two-thirds of the world, afforestation increases low-level cloud cover, with the effect being strongest over evergreen needleleaf forest, according to the European Space Agency (ESA).

Because trees sequester carbon dioxide from the atmosphere and convert it into biomass, forests are widely championed for their role in mitigating climate change. What has been less clear, however, is how forests affect the climate in other ways such as their role in the water cycle and surface energy balance.

The paper, published recently in Nature Communications, uses global data records of cloud and land-fractional cover produced by the ESA's Climate Change Initiative to examine the effect of the transition of vegetation cover into the deciduous and evergreen forest.

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"Earth observations are increasingly showing that trees and forests are impacting climate by affecting biophysical surface properties," Alessandro Cescatti, one of the co-authors of the study.

The paper describes how cloud generally increased over the whole year in afforested areas in temperate, tropical and arid regions, sometimes by as much as 15%.

However, during the boreal winter and spring across North America, Russia and Eastern Europe, when these regions have prolonged snow cover, the authors found a reduction in cloud cover over forests compared to open land. The boreal summer, on the other hand, has strong and consistent increases in cloud fraction by about 5%.

"Without global cloud and land-cover type observations from satellites, this study would not have been possible on a global scale," said Martin Stengel, who leads the Climate Change Initiative Cloud project. "The authors of this study appreciated the high-spatial resolution of the initiative's products."

"Studies like this one, based on robust satellite observations, are fundamental to characterise the complexity of the climate system and provide benchmarks for climate model developments," Dr Cescatti said.

The team emphasises that land-based climate mitigation through afforestation, forest restoration and avoided deforestation should not be reasoned purely in terms of carbon capture. Instead, policies should include the wider climate benefits that forests offer, including increasing cloud cover for localised cooling and generating rainfall, giving forests additional hydrological value.

World+Biz

Satellite / Forest

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