Computer Model Offers First-Ever Detailed Look at Earth's 'Ignorosphere'

The past few centuries have yielded an abundance of information about Earth’s atmosphere, from the weather that manifests in the troposphere and stratosphere to the vast amounts of heat absorbed by the thermosphere. Sandwiched between those layers, though, lies the mesosphere, an atmospheric region roughly 35 kilometers (22 miles) thick. While weather balloons access the lower part of Earth’s atmosphere and satellites tackle the upper region, the mesosphere is an awkward place to reach; stratospheric balloons can’t quite get there, and satellites don’t typically “see” high-resolution atmospheric data so far down.
The mesosphere has proven so difficult to study that some scientists call it the “ignorosphere.” But this layer of the atmosphere can’t really be ignored. Not only is it responsible for protecting Earth from meteors, but it’s where most human-made space equipment burns upon reentry. The metals that break down through these processes add metallic ions to the atmosphere, potentially affecting other layers. Some high-altitude clouds also seem to form in the mesosphere.
The information scientists have managed to gather about the mesosphere is owed to ground-based radar and LIDAR equipment, which can continuously observe the layer’s winds and temperatures but cannot map the layer globally. This means scientists’ understanding of the mesosphere is a bit like a platter of sliced Swiss cheese: thin and with a lot of holes. To fill in the gaps, researchers at the University of Tokyo plugged what little is known about the mesosphere into a data assimilation model they had previously developed. Then they used the model to reverse-engineer the mesospheric conditions that would allow scientists’ few findings to take shape. 
The results, dubbed JAWARA, offer the longest-ever look at Earth’s mesosphere. With 19 years’ worth of data (September 2004 to December 2023), the model paints a picture of how the mesosphere likely evolved across recent history. 
Kaoru Sato, an Earth scientist and the corresponding author of the study, told the University of Tokyo that JAWARA contains researchers’ first-ever look at the hierarchy of gravity waves and vortices in the mesospheric layer. These waves are responsible for transferring energy vertically through different atmospheric strata, producing everything from air turbulence to cloud formation. Understanding the mesosphere will also allow scientists to obtain a better grasp on the atmosphere as a whole.
Sato and his colleagues plan to use JAWARA to study atmospheric general circulation—the movement of air around Earth—as well as interactions between the Northern and Southern hemisphere. In the interest of advancing both Earth and space science, the team has made JAWARA available online.
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