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Editors’ Highlights are summaries of recent papers by AGU’s journal editors.

Source: AGU Advances

Atmospheric models describing climate change rely on accurate depictions of chemical transport. Prather [2025] examines the different ways to define the troposphere, a highly chemically heterogeneous domain influenced by a range of chemical sources and sinks, from lightning, wildfires, and pollution to convection and rainfall.

The author builds on previous work proposing the use of the artificial age-of-air tracer e90. After calibrating the e90 tracer, Prather demonstrates its application in calculating the mass of the troposphere and troposphere ozone values, using output from UC Irvine’s chemical transport model, ozonesondes representing northern and southern mid-latitudes and the tropics, and satellite ozone profiles. This work presents a practical demonstration of the calibration of an age-of-air tropopause that could potentially be applied more widely in other models or other age-of-air tracers.  

Citation: Prather, M. J. (2025). Calibrating the tropospheric air and ozone mass. AGU Advances, 6, e2025AV001651. https://doi.org/10.1029/2025AV001651

—Kristina Vrouwenvelder, Executive Editor, AGU Advances

Text © 2025. The authors. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Editors’ Highlights are summaries of recent papers by AGU’s journal editors.

Source: AGU Advances

Incoming radiation from the Sun is balanced by reflected and emitted radiation from Earth, but greenhouse gases trap radiation in Earth’s atmosphere, causing energy to accumulate in the atmosphere, oceans, and land.

Mauritsen et al. [2025] discuss how recent work analyzing Earth’s energy imbalance reveals that it is increasing much faster than predicted and is now almost double what has been predicted by climate models. The current discrepancy between the measured energy imbalance and that predicted by climate models is likely caused by a decrease in Earth’s solar reflectivity, possibly because models have not correctly accounted for sea surface temperature patterns or effects of aerosol particles.

Understanding these changes in Earth’s energy imbalance and their effects on global warming is critical to science and policy. However, these measurements rely heavily on several satellites scheduled for decommissioning, threatening our understanding of our climate future.

Citation: Mauritsen, T., Tsushima, Y., Meyssignac, B., Loeb, N. G., Hakuba, M., Pilewskie, P., et al. (2025). Earth’s energy imbalance more than doubled in recent decades. AGU Advances, 6, e2024AV001636. https://doi.org/10.1029/2024AV001636

—Kristina Vrouwenvelder, Executive Editor, AGU Advances

Text © 2025. The authors. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.