Shim et al. (2025) East Asian dust source region restructuring linked to recent extreme drying

Identification

• Journal: The Science of The Total Environment
• Year: 2025
• Date: 2025-11-10
• Authors: Kyuseok Shim, S. Kim, Ye-Jun Jun, Chanil Park, Seo‐Yeon Kim, Seok‐Woo Son, Daehyun Kim, Jee‐Hoon Jeong
• DOI: 10.1016/j.scitotenv.2025.180889

Research Groups

• School of Earth and Environmental Sciences, Seoul National University, Seoul, Republic of Korea
• Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, USA
• Schiller Institute for Integrated Science and Society, Boston College, Chestnut Hill, MA, USA
• Department of Environment and Energy, Sejong University, Seoul, Republic of Korea

Short Summary

This study reveals a significant northward expansion of East Asian dust source regions, particularly over Mongolia, driven by extreme regional drying and reduced summer precipitation over the past three decades, which has fundamentally altered soil conditions and nearly tripled dust outbreaks.

Objective

• To demonstrate and understand the mechanisms behind the northward expansion of East Asian dust source regions, specifically how extreme regional drying and large-scale atmospheric circulation changes driven by ocean-atmosphere teleconnections have altered soil conditions and increased dust emissions.

Study Configuration

• Spatial Scale: Inland East Asia, including the Gobi Desert, areas north of the Gobi Desert (Mongolia), and the Tibetan Plateau.
• Temporal Scale: Past three decades (approximately 1990s-2020s), with a focus on changes observed since 2000.

Methodology and Data

• Models used: Not explicitly stated; the study relies on analysis of dust occurrence probability distributions and large-scale atmospheric circulation changes.
• Data sources: Implied observational data for Dust Occurrence Frequency (DOF), precipitation, and soil properties (erodibility, threshold wind speeds); reanalysis data for large-scale atmospheric circulation patterns, including Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO), and East Asian Summer Jet Stream (EASJ).

Main Results

• The East Asian dust source region has undergone substantial northward expansion from the traditional Gobi Desert over the past three decades.
• Dust outbreaks nearly tripled from 4.6 to 13.4 days annually in areas north of the Gobi Desert since 2000.
• Extreme regional drying, caused by an unprecedented decline in precipitation, fundamentally altered soil conditions across the northern inland plateau of East Asia, dramatically increasing surface erodibility and lowering threshold wind speeds for dust emission.
• Soil properties in the expanded region now mirror those of the traditional Gobi Desert source area.
• This restructuring is linked to large-scale atmospheric circulation changes driven by concurrent shifts in the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO), which reinforced a summer anticyclone over East Asia.
• The Tibetan Plateau and East Asian Summer Jet Stream (EASJ) amplified precipitation deficits under PDO-AMO shifts.

Contributions

• Demonstrates and quantifies the substantial northward expansion of East Asian dust source regions, linking it directly to recent extreme regional drying and large-scale atmospheric circulation changes.
• Provides a mechanistic understanding of how regional drying caused by decreased precipitation under global warming can rapidly transform dust source geography by altering soil conditions and surface erodibility.
• Highlights the critical role of ocean-atmosphere teleconnections (PDO, AMO) and regional climate variables (Tibetan Plateau, EASJ) in driving these observed changes.

Funding

• Not specified in the provided text.

Citation

@article{Shim2025East,
  author = {Shim, Kyuseok and Kim, S. and Jun, Ye-Jun and Park, Chanil and Kim, Seo‐Yeon and Son, Seok‐Woo and Kim, Daehyun and Jeong, Jee‐Hoon},
  title = {East Asian dust source region restructuring linked to recent extreme drying},
  journal = {The Science of The Total Environment},
  year = {2025},
  doi = {10.1016/j.scitotenv.2025.180889},
  url = {https://doi.org/10.1016/j.scitotenv.2025.180889}
}