Highland Pathways Shape Global Dust Vertical Transport and Its Climate Effects

[Geoengineering News]

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2026GL123758

Authors: Yuzhi Liu, Qingzhe Zhu, Weiqi Tang, Dan Li

First published: 28 May 2026

https://doi.org/10.1029/2026GL123758

Abstract

Highlands govern global dust vertical transport, yet their region-specific pathways and climatic impacts remain unclear. We found that although dust emissions from highlands are minimal, the dust content in the middle and upper atmosphere over highlands is high, identifying highlands as key dust conduits. The Tibetan Plateau dominates the uplift of East Asian dust, and the Iranian Plateau mainly drives the lifting of Middle Eastern dust. The uplift of North African dust is affected not only by highlands but also, to a large extent, by tropical convection. Under rising dust emissions, dust enrichment significantly intensifies in the upper layers, particularly over highlands, far exceeding the increase in lower-layer dust, suggesting their potential for solar radiation management geoengineering. Notably, enhanced dust emissions cool the surface and lower troposphere but warm the mid-upper troposphere. Thus, although highlands offer promise for climate intervention, their stratospheric warming effects and environmental impacts necessitate caution.

Plain Language Summary

Dust from deserts influences global climate by affecting radiation balance and temperature profile, but how it reaches the upper layers from low-altitude source regions has remained unclear. Our research demonstrates that high-altitude regions, particularly the Tibetan Plateau and the Iranian Plateau, function as the Earth's primary “dust elevators.” By combining satellite observations with model simulations, we found that these highlands efficiently transport dust upward, creating elevated dust layers. This process generates a dual climate effect: the dust cools the Earth's surface by blocking solar radiation while simultaneously warming the mid-to upper atmosphere through radiation absorption. Importantly, highlands disproportionately amplify dust climate impact through this vertical transport mechanism. These findings are crucial for improving climate predictions and for accurately evaluating solar radiation management geoengineering proposals. Understanding these natural “elevator” pathways is essential, as potential climate interventions targeting aerosols might inadvertently leverage these same routes, with potentially widespread atmospheric consequences.

Source: AGU