Abstract Atmospheric conditions and physical characteristics of the earth surface have an important effect on the spatiotemporal variations of sand-dust events. The main objective of the present study was to investigate the effect of these variables on the seasonal variation of these events in semi-arid regions of Central Iran Zone (CIZ). The Ridge Regression (RR) method was used to analyze the relationship between seasonal variations of precipitation, surface winds speed, air temperature, and Enhanced Vegetation Index (EVI) with Dust Storm Index (DSI) for two different periods (2001–2008 and 2009–2016). The dusty winds direction around the study area was also determined using the dust roses. The results showed that the annual DSI changes in the study area had a week incremental trend with a rate of 0.07/8 yrs in the previous period while it followed a strong increasing trend with a rate of 0.22/8 yrs in the latter period. It was also found that the activity of sand-dust storms in the second period was greater than the first period, especially in the border region of Iran and Turkmenistan. According to RR analysis, DSI had a significant positive association with the surface winds speed in the summer (β = +0.48; p-value 0.05). In the second period, the surface winds speed was positively correlated with the DSI in the spring (β = +2.04), summer (β = +2.6) and autumn (β = +2.08). The significant negative relationship between EVI and DSI changes was observed only in the spring season (β = −0.7; p-value

中文翻译：

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伊朗中部半干旱地区沙尘事件的空间和季节变化及其与大气条件和植被覆盖的关系

摘要 地表大气条件和物理特征对沙尘事件的时空变化有重要影响。本研究的主要目的是调查这些变量对伊朗中部地区 (CIZ) 半干旱地区这些事件的季节性变化的影响。岭回归 (RR) 方法用于分析两个不同时期（2001-2008 和 2009 年）降水、地表风速、气温和增强型植被指数 (EVI) 与沙尘暴指数 (DSI) 的季节性变化之间的关系–2016）。研究区域周围的尘风方向也使用尘玫瑰确定。结果表明，研究区年DSI变化呈周递增趋势，速率为0。前一时期为 07/8 年，而后一时期呈 0.22/8 年的强劲增长趋势。还发现第二阶段沙尘暴的活动大于第一阶段，尤其是在伊朗和土库曼斯坦边境地区。根据 RR 分析，DSI 与夏季地表风速呈显着正相关（β = +0.48；p 值 0.05）。第二阶段，春季（β=+2.04）、夏季（β=+2.6）和秋季（β=+2.08）地表风速与DSI呈正相关。仅在春季观察到 EVI 和 DSI 变化之间的显着负相关（β = -0.7；p 值 还发现第二阶段沙尘暴的活动大于第一阶段，尤其是在伊朗和土库曼斯坦边境地区。根据 RR 分析，DSI 与夏季地表风速呈显着正相关（β = +0.48；p 值 0.05）。第二阶段，春季（β=+2.04）、夏季（β=+2.6）和秋季（β=+2.08）地表风速与DSI呈正相关。仅在春季观察到 EVI 和 DSI 变化之间的显着负相关（β = -0.7；p 值 还发现第二阶段沙尘暴的活动大于第一阶段，尤其是在伊朗和土库曼斯坦边境地区。根据 RR 分析，DSI 与夏季地表风速呈显着正相关（β = +0.48；p 值 0.05）。第二阶段，春季（β=+2.04）、夏季（β=+2.6）和秋季（β=+2.08）地表风速与DSI呈正相关。仅在春季观察到 EVI 和 DSI 变化之间的显着负相关（β = -0.7；p 值 春季（β=+2.04）、夏季（β=+2.6）和秋季（β=+2.08）地表风速与DSI呈正相关。仅在春季观察到 EVI 和 DSI 变化之间的显着负相关（β = -0.7；p 值 春季（β=+2.04）、夏季（β=+2.6）和秋季（β=+2.08）地表风速与DSI呈正相关。仅在春季观察到 EVI 和 DSI 变化之间的显着负相关（β = -0.7；p 值