Archives par mot-clé : Albedo

climate-debate

Another New Study Links Modern And Past Global Warming To Natural Changes In Cloud Clover, Not CO2

by K. Richard, Aug 12, 2026  in NoTricksZone

Cloud cover changes are a “top-down dynamical driver” of Earth’s climate.

A July 2026 Environmental Research Letters paper authored by Bellocchi et al.attributes ~80% of the rise in Earth’s absorbed solar radiation since 2000 to declining high-reflectivity cloud cover, primarily from circulation-driven contraction of storm-cloud zones.

The study highlights the climate’s “albedo governance,” suggesting a 1% shift in Earth’s albedo corresponds to a 1°C surface temperature change.

With more cloud cover, more solar radiation is reflected and the surface cools. With declining cloud albedo, which has been observed since 1980, less solar radiation is reflected and the surface warms.

Cloud cover changes are driven by natural atmospheric circulation modes and internal variability. This is supported by reconstruction data showing cloud cover decline has for centuries occurred independently from “greenhouse-gas forcing.”

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climate-debate

New Study: Warming Trend Since 2013 From Increased Absorbed Solar Radiation, Not CO2

by K. Richard, Dec 26, 2024 in ClimateChangeDispatch

The 2013-2022 warming trend and the extreme warmth in 2023 were “not associated with” declining outgoing long-wave radiation induced by rising greenhouse gases. [emphasis, links added]

Instead, a new study published in the journal Science contends that decreasing cloud albedo and the consequent increase in ASR, or absorbed solar radiation (+0.97 to 1.10 W/m²/decade according to ERA5 and CERES, respectively) explains the warming over the last decade. (Less cloud cover means more solar radiation reaches the Earth’s surface, warming it.)

A rising trend in anthropogenic greenhouse gases was supposed to reduce the Earth’s outgoing long-wave radiation (OLR), and a declining OLR was thought to be the driver of modern warming.

Instead, the opposite has occurred. There has been an increasing OLR trend since 2013.

This enhancement of the Earth’s OLR trend actually serves to counteract the ASR-induced warming strongly associated with the aforementioned declining cloud cover albedo.

In other words, the total greenhouse effect impact from rising greenhouse gases has recently been contributing to a reduction in global warming, partially offsetting the warming induced by rising ASR.

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