What is causing the Northern Hemisphere to become darker?

Satellite data shows that the loss of reflective Arctic sea ice and snow cover, as well as the decline in airborne pollutants called aerosols, are the primary factors behind the Northern Hemisphere's darkening.

How does the hemispheric imbalance in solar energy absorption affect the Earth's climate?

The extra heat absorbed in the Northern Hemisphere could intensify warming on northern continents, disrupt wind patterns and ocean currents, and alter rainfall patterns that sustain billions of people.

What are the implications of this study for climate models and policymakers?

The findings challenge the assumption that the Earth's climate system will self-regulate, and suggest that climate models may need to be updated to better account for hemispheric differences in energy balance. Policymakers will need to consider the uneven effects of global warming as they develop strategies for adaptation and mitigation.

Home / Science / Satellites Detect Alarming Darkening of Northern Hemisphere

Satellites Detect Alarming Darkening of Northern Hemisphere

5 Oct

•

Summary

Satellites track 24 years of declining reflectivity in the Northern Hemisphere
Loss of Arctic sea ice and snow cover absorbing more solar energy
Reduced aerosol pollution decreases reflective properties of clouds

Satellites Detect Alarming Darkening of Northern Hemisphere

For over two decades, satellites have been quietly monitoring the flow of sunlight and heat through the Earth's atmosphere. According to a recent study, this data now reveals a concerning trend: the Northern Hemisphere is steadily becoming darker compared to the Southern Hemisphere.

The study, led by NASA climate scientist Dr. Norman G. Loeb, analyzed 24 years of measurements from the Clouds and the Earth's Radiant Energy System (CERES) satellite. The data shows that the Northern Hemisphere has been receiving about 0.34 watts per square meter more solar energy every decade than the Southern Hemisphere. While this may seem like a small difference, it is statistically significant and could have profound implications for the Earth's delicately balanced energy system.

The darkening of the Northern Hemisphere is attributed to several intertwined factors. The melting of reflective Arctic sea ice and snow cover has exposed darker land and ocean surfaces that absorb more heat. Additionally, the decline in airborne pollutants called aerosols has reduced the scattering of sunlight and the formation of reflective clouds.