El Niño Southern oscillation events contribute significantly to the interannual variations of dust activity over East Asia

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-12-04 DOI:10.1016/j.atmosres.2024.107846

Ruibo Zhao , Xiaoming Feng , Chaowei Zhou , Yu Zhang , Xuejing Leng , Bojie Fu

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Abstract

The mechanism of climate and vegetation change induced dust variations has been a phenomenal environmental concern in East Asia. However, the extent to which climate and vegetation cover separately affect the interannual variations of dust activity, is little known. Here in our study, the dust interannual variations and the contributions of climate and vegetation changes on dust variations were investigated and quantified through a regional climate model (RegCM4.9.5) and GeoDetector analysis. It is indicated that the dust aerosol optical depth, column burden and emission flux over East Asia all showed fluctuating downward trends followed by subsequent increases during 2000–2018. Climatic factors dominated the interannual variation of dust over East Asia, particularly the modulation of El Niño Southern Oscillation events. Vegetation improvement has occurred in most dust source regions across East Asia, playing a secondary yet positive role in dust variations, with an overall contribution rate of approximately 37 %. The spatial heterogeneity of dust variations in different regions was shaped by the effects of climate change and improved vegetation conditions.

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厄尔尼诺南方涛动事件对东亚上空沙尘活动的年际变化有重大影响

气候和植被变化引起的沙尘变化机制一直是东亚环境研究的热点问题。然而，气候和植被覆盖分别对沙尘活动年际变化的影响程度却鲜为人知。通过区域气候模式（RegCM4.9.5）和GeoDetector分析，研究了沙尘的年际变化以及气候和植被变化对沙尘变化的贡献。结果表明，2000-2018年东亚地区气溶胶光学深度、柱状负荷和发射通量均呈现先上升后下降的波动趋势。东亚地区沙尘的年际变化主要受气候因子的影响，尤其是El Niño南方涛动事件的调节。东亚大部分沙尘源区的植被改善在沙尘变化中起着次要但积极的作用，总体贡献率约为37%。不同区域沙尘变化的空间异质性主要受气候变化和植被条件改善的影响。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.