Scholarlink

<p>Mineral dust plays a critical role in modulating the Earth’s radiation budget by scattering and absorbing solar radiation; however, uncertainties remain due to limited knowledge of particle morphology, chemical composition, mixing state, and internal structure. To address these gaps, mineral dust (PM<sub>5</sub>; Dia. ≤5&#xa0;μm) particles were collected during two consecutive sand and dust storms (SDS) [ 4th May 2022 (SDS<sub>a</sub>) and 6th May 2022 (SDS<sub>b</sub>)] over Jhunjhunu region, in the vicinity of the Thar Desert. Advanced analytical techniques like Electron Paramagnetic Resonance Spectroscopy (EPR), Focused Ion Beam Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (FIB-SEM-EDS), and Atomic Force Microscopy (AFM) were utilized for in-depth analysis of physico-chemical characteristics of mineral dust at the bulk and individual particle level. FIB-SEM-EDS revealed internally heterogeneous particles with distinct core-shell structures during both SDS, indicating atmospheric aging and complex mixing processes. EPR analysis confirmed the presence of paramagnetic Fe³⁺ ions during both events aligning with the g-factor values reported in the literature for Fe<sup>3+</sup> ions. AFM highlighted pronounced surface morphological irregularities, with SDS<sub>a</sub> particles exhibiting more surface roughness (46, 55, and 77&#xa0;nm) being more intense compared to SDS<sub>b</sub> (26, 41, and 44&#xa0;nm).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Characterisation of mineral dust particles amidst sand and dust storm occurring in The Thar Desert Region

  • 期刊论文

  • 发表日期：

    2026年8月4日

查看全文
  • Mamta Devi,
  • Sumit Kumar Mishra,
  • Sudhir Husale,
  • Gounda Abdul Basheed,
  • Aamir Khan,
  • Rishabh Singh,
  • Kartika Pandey,
  • Supreet Kaur,
  • Mandeep Kaur

摘要

Mineral dust plays a critical role in modulating the Earth’s radiation budget by scattering and absorbing solar radiation; however, uncertainties remain due to limited knowledge of particle morphology, chemical composition, mixing state, and internal structure. To address these gaps, mineral dust (PM5; Dia. ≤5 μm) particles were collected during two consecutive sand and dust storms (SDS) [ 4th May 2022 (SDSa) and 6th May 2022 (SDSb)] over Jhunjhunu region, in the vicinity of the Thar Desert. Advanced analytical techniques like Electron Paramagnetic Resonance Spectroscopy (EPR), Focused Ion Beam Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (FIB-SEM-EDS), and Atomic Force Microscopy (AFM) were utilized for in-depth analysis of physico-chemical characteristics of mineral dust at the bulk and individual particle level. FIB-SEM-EDS revealed internally heterogeneous particles with distinct core-shell structures during both SDS, indicating atmospheric aging and complex mixing processes. EPR analysis confirmed the presence of paramagnetic Fe³⁺ ions during both events aligning with the g-factor values reported in the literature for Fe3+ ions. AFM highlighted pronounced surface morphological irregularities, with SDSa particles exhibiting more surface roughness (46, 55, and 77 nm) being more intense compared to SDSb (26, 41, and 44 nm).