NASA’s new satellite sees rainbows everywhere to decode our planet’s complex atmosphere
The PACE satellite uses advanced polarimeters to detect light properties invisible to human eyes. By measuring how light waves oscillate when they bounce off clouds and airborne particles, scientists can finally map the composition and behavior of our atmosphere in unprecedented detail.
Launched in February 2024, the PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) mission utilizes two specialized instruments, HARP2 and SPEXone, to study Earth’s atmosphere. While human vision perceives color, these polarimeters detect polarization—the specific direction in which light waves oscillate after interacting with particles like dust, smoke, sea salt, and pollutants. Because polarization changes based on what light hits, these sensors allow researchers to determine the size, abundance, and chemical makeup of aerosols and water droplets.
The mission is critical for climate science, as aerosols influence how much solar energy reaches the surface and how clouds form. By replacing current model estimates with precise, real-time data, PACE aims to reduce uncertainty in climate predictions. HARP2, developed at the University of Maryland, Baltimore County, observes four wavelengths from 60 angles, while the Dutch-built SPEXone provides hyperspectral resolution. Together, they enable a clearer understanding of air quality and the long-term shifts in our climate.
Source: PACE's Instruments Reveal a New Dimension of Atmospheric Info
