摘要
Central East Asia is a major global dust source that significantly impacts the Asia-Pacific region.However,eventlevel quantification of dust contributions remains limited.This study quantified hourly dust emissions during 136 large dust events in Central East Asia from 2000 to 2023 using the algorithm of Wind Erosion Prediction System(WEPS)model.The results revealed that since the beginning of 21 st century,the annual frequency of dust events declined from 9 in the early 2000s to3 in recent years,corresponding to an average decrease of 0.173×10^(6)t per year in dust emissions,indicating a general reduction in dust activity.However,dust emissions rebounded after 2020,increasing from 5.70×10^(6)t in 2020 to 40.3×10^(6)t in 2023.The contribution of Mongolian dust sources increased from 43%in the early 2000s to 53%in recent years,peaking at 62%in 2022 and 64%during a major event in 2023.The primary factors contributing to the changes in dust emissions are stronger surface winds,reduced vegetation cover,and declining soil moisture,with relative contributions of 46%,19%,and 9%,respectively.Mongolia's increasing contribution to large dust events indicates a shift in the major dust source regions of Central East Asia,underscoring the need to assess its potential impacts on regional climate and ecological stability.
基金
supported by the Major Science and Technology Project,Ministry of Water Resources,China(Grant No.SKR-2022053)
the Excellent Member of Youth Innovation Promotion Association of CAS(Grant No.Y202085)。
