East Asian dust source region restructuring linked to recent extreme drying

Understanding how major dust sources respond to climate change has been a great challenge, limiting our ability to predict atmospheric dust emissions. Here, we demonstrate that the East Asian dust source region has undergone substantial northward expansion from the traditional Gobi Desert over the past three decades, with dust outbreaks nearly tripling from 4.6 to 13.4 days annually in areas north of the Gobi Desert since 2000. We show that extreme regional drying caused by an unprecedented decline in precipitation has fundamentally altered soil conditions across the northern inland plateau of East Asia, dramatically increasing surface erodibility and lowering threshold wind speeds for dust emission. Analysis of dust occurrence probability distributions reveals that soil properties in the expanded region now mirror those of the traditional Gobi Desert source area. This restructuring results from large-scale atmospheric circulation changes driven by concurrent shifts in ocean-atmosphere teleconnections and regional climate variables. Our findings highlight how regional drying caused by decreased precipitation under global warming can rapidly transform dust source geography, with implications for atmospheric composition, radiative balance, and downwind ecosystems.