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Interannual variations of dust activity in western Iran and their possible mechanisms

机译：西伊朗粉尘活动的依赖性变化及其可能的机制

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Through an analysis of station observations and reanalysis data, in this study, we investigate the variations of dust activity during 1979–2015 in western and southwestern Iran and their associated mechanisms. The dust day frequency (DDF) is used to identify dust activities. The results show larger interannual variabilities in the DDF in spring and summer, with standard deviations (σ) of 10% and 13%, respectively. Correlation analyses reveal that the interannual variability of DDF in western Iran is largely regulated by wind speed, precipitation and soil moisture in the region. The regional mean spring (March–May) DDF shows strong negative correlations with spring precipitation (correlation coefficient R =??0.5) and soil moisture (R =??0.6) over western to southwestern Iran, but strong positive correlations between the springtime DDF and surface winds can be found with the R reaching 0.4–0.6. Dust activity in the summer dry season (June–August) is mainly associated with surface winds over southwestern Iran, especially in regions near the Persian Gulf, where the R between the DDF and surface winds reaches 0.5. Meanwhile, the summer DDF also shows strong negative correlations (R < ?0.4) with soil moisture of the top layer in the middle to southern part of the region. These results highlight the key roles of wind speed, precipitation and soil moisture in determining the interannual variation of dust activities in western and southwestern Iran.
机译：通过对驻地观测和再分析数据的分析，在本研究中，我们研究了西南伊朗西南和西南部和相关机制的1979 - 2015年粉尘活动的变化。粉尘日频率（DDF）用于识别粉尘活动。结果表明，春季和夏季DDF中的互际变量较大，标准差（σ）分别为10％和13％。相关性分析表明，西伊朗西部DDF的持续变异主要受到该地区风速，降水量和土壤水分的调节。区域平均春季（3月级）DDF显示出与伊朗西南部西南部的春季沉淀（相关系数 r = 0.5）和土壤水分（ r =Δ0.6）的强度相关性。春天DDF和表面风之间的正相关性可以发现 r达到0.4-0.6。夏季干燥季节（八月）的粉尘活动主要与伊朗西南部的表面风相关联，特别是在波斯湾附近的地区，DDF和表面风之间的 r达到0.5。同时，夏季DDF还显示出强烈的负相关（ R <0.4），该地区中部至南部的中间层的土壤水分。这些结果突出了风速，降水和土壤水分在确定西南和西南部伊朗粉尘活动的依赖变化中的关键作用。

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