Response of Dust Occurrences to Global Warming in Northeastern Iran Using MAIAC Satellite Observations and CMIP6-HighResMIP Simulations

Document Type : Research Paper

Author

Department of Geography, Faculty of Letters and Humanities, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

Objective: Northeastern Iran is acutely vulnerable to environmental hazards, a vulnerability largely driven by persistent droughts and widespread land-use changes. Despite this deep-seated ecological sensitivity, the development of robust risk management and hazard mitigation strategies has been severely hindered by a distinct lack of predictive dust simulations. Addressing this critical shortfall, the present study is designed to elucidate exactly how regional dust occurrences respond to global warming. By doing so, we provide a rigorous assessment of future dust emission trajectories under shifting climate conditions.
Methodology: Fundamentally, this research leverages the synergy between remote sensing observations and climate projections derived from the CMIP6-HighResMIP. To effectively monitor and extract aerosol optical depth (AOD) dynamics, we processed the MAIAC satellite product at a fine horizontal resolution of 1,000 meters, spanning the 2001–2025 period. Evaluating the intensity of dust source activities alongside the classification of particulate concentrations required a robust statistical approach. To achieve this, an event frequency index was computed across three distinct thresholds: AOD ≥ 0.25, AOD ≥ 0.50, and AOD ≥ 1.0. Projecting future dust aerosol occurrences for the 2026–2050 period involved extracting simulation data from the CNRM-CM6-1 model outputs, which are governed by the HighResMIP protocol at a 50-km horizontal resolution. Ultimately, to capture internal variability, a multi-member ensemble was generated utilizing three independent realizations of this model.
Results: Topographic gradients and proximity to the transboundary Karakum hotspots directly govern the structural heterogeneity of aerosols across the northeast of Iran. Long-term observational data reveal that the aerosol optical depth (AOD) fluctuates between 0.05 and 0.43. The eastern maxima cores, recording historical values from 0.23 to 0.43, are currently experiencing positive upward trends of up to 0.12 per decade. In stark contrast, mountainous terrain acts as an aerodynamic shield that effectively suppresses these concentrations to a significantly lower range of 0.05 to 0.14. Background event frequencies within the eastern cores are 22.7% to 38.7%. When extreme storm thresholds are breached, aerosol generation across the central zones abruptly ceases, confining particle production strictly to the eastern border focal points at a peak of 14%. Historical multi-member ensemble simulations estimate a narrower mean AOD bracket of 0.13 to 0.21, with a dampening effect primarily driven by sub-grid smoothing artifacts. The future projection shows a substantial amplification in aerosol loading along the northeastern corridor, at a rate of between 27.7% and 30.64%. Conversely, anticipated growth throughout the western sectors remains heavily marginalized, restricted to a mere 1.33% to 4.27%.
Conclusions: According to the results, the increasing trend of aerosol optical depth (AOD) is fundamentally rooted in thermodynamic shifts, driven by soil moisture depletion and a depressed threshold for wind friction velocity. As aerosols accumulate, their resulting thermal loading disrupts the radiative equilibrium between the surface and the atmosphere. This dynamic cools the ground while simultaneously warming the upper atmosphere. The static stability induced by such a temperature inversion ultimately stifles convective precipitation. To preserve the resilience of regional food security against these cascading impacts, policy frameworks must prioritize climate adaptation strategies anchored in integrated soil and water management. Parallel to these domestic efforts, proactive environmental diplomacy remains essential to mitigate and stabilize transboundary dust emission hotspots.

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References

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Journal of Environmental Studies
Volume 52, Issue 1
June 2026
Pages 127-147

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