December 7, 2021

Climate Change News

Saving The Planet

A new study confirms the climatic connection Sun / Cosmic Rays

A new study published in Nature Scientific Reports by researchers at the Danish National Space Institute of the Danish Technical University (DTU) and the Hebrew University of Jerusalem suggests that the Sun’s activity in detecting cosmic rays affects clouds and , ultimately, the Earth’s energy budget. with concomitant climatic effects.

This research, conducted by Henrik Svensmark, Jacob Svensmark, Martin Bødker Enghoff and Nir Shaviv, supports 25 years of discoveries that point to an important role of cosmic rays in climate change.

In particular, it connects observable variations in the clouds and the Earth’s energy budget with the experiments and theory of the Copenhagen laboratory, showing how cosmic rays help make aerosols and accelerate their growth into condensation nuclei. of clouds and ultimately in clouds.

Eruptions in the Sun protect the Earth from galactic cosmic rays: energy particles that rain on our planet from exploded stars.

“The Sun conducts fantastic natural experiments that allow us to test our ideas about the effects of cosmic rays on the atmosphere,” Professor Henrik Svensmark, lead author of the study, told GWPF.

Solar flares produce magnetized gas that passes through the Earth reducing the flow of cosmic rays that reaches us. These events are said to have diminished Forbush taking its name from the American physicist Scott E. Forbush, who first noticed them more than 80 years ago.

They lead to a temporary reduction in the production of small aerosols (molecular clusters in the air) that normally grow to sow water droplets from low-level clouds. In turn, this reduces the cloudiness that is known to affect the climate.

The recent breakthrough is that the effect on the Earth’s energy budget has been quantified through satellite observations of the CERES instrument on NASA’s Earth and Aqua satellites.

Observational data indicate that the Earth absorbs almost 2 watts per square meter of additional energy within 4 to 6 days of the minimum of cosmic rays.

Such a big effect is a big surprise as the general consensus of the climate community, recently expressed in the 2021 IPCC report AR6 (chapter 7.3.4.5), is that “… the GCR [galactic cosmic rays] effect on CCN [cloud condensation nuclei] it is too weak to have any detectable effect on climate and no solid association was found between GCR and cloud cover. … There is great confidence that GCRs contribute to insignificant FRE [effective radiative forcing] during the period 1750-2019 “.

These new results show that the conclusion of the IPCC will have to be re-evaluated. Two watts per square meter can be compared with the estimate of the IPCC report on solar effective radiative forcing during the period 1750 to 2019 of only 0.01 watts per square meter (obtained only taking into account the changes in ‘solar radiation).

“We now have simultaneous observations of declining cosmic rays, aerosols, clouds, and the energy budget,” says Professor Nir Shaviv.

The solar effects in this study are too brief to have a lasting effect on the climate, but they point to research that could uncover how the mechanism works in the long run.

“It could be that the effect of carbon dioxide on the atmosphere (the so-called climate sensitivity) could be less than is inferred from climate models when this effect is taken into account,” adds Professor Svensmark.

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