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The influence of the polar front jet stream on the formation of dust events in the southwest of Iran

机译：极地前喷流对伊朗西南部粉尘事件形成的影响

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摘要

Dust events are among the climatic hazards which may occur the year over in the southwest of Iran. The goal of this research was to investigate the role of the Polar Front Jet Stream (PFJ) as one of the most important synoptic patterns affecting the formation of dust events in the southwest of Iran during statistical period (1998–2012). The research method was a combination of statistical-synoptic and remote sensing analyses. The frequency of occurrence, duration and intensity of dust events were studied by using hourly data of 5 synoptic weather stations. Also, climatic stability condition considering climatic conditions of ground level and 500 hpa level was investigated by using networked data obtained from the NCEP. Dust detection was done by using the data of Meteosat 7 satellite and MODIS sensor of Aqua satellite. In addition, weather conditions were analyzed simultaneously with dust events using dust measurement indices such as Aerosol Absorption Index (AAI) of TOMS sensor and Aerosol Optical Depth (AOD), and concentration rate of dust and visibility extracted from the output data of the numerical simulation model (COAMPS). Statistical results showed that the main factor of more than 20 % of total dust events in the southwest of Iran was the synoptic pattern of the PFJ, leading to the formation of dust events in the cold period of the year. Finally, synoptic analysis of weather maps and satellite images clearly indicated the effective role of PFJ in the formation of dust events of cold periods in the southwest of Iran.
机译：灰尘事件是伊朗西南部全年可能发生的气候灾害之一。这项研究的目的是调查极地前喷流（PFJ）作为统计期内（1998-2012）影响伊朗西南部粉尘事件形成的最重要天气模式之一的作用。该研究方法是统计概要和遥感分析的结合。利用5个天气气象站的每小时数据，研究了尘埃事件的发生频率，持续时间和强度。此外，通过使用从NCEP获得的网络数据，研究了考虑地面水平和500 hpa水平的气候条件的气候稳定条件。利用Meteosat 7卫星的数据和Aqua卫星的MODIS传感器进行了粉尘检测。此外，使用TOMS传感器的气溶胶吸收指数（AAI）和气溶胶光学深度（AOD）等粉尘测量指标，同时分析了天气状况和粉尘事件，并从数值模拟的输出数据中提取了粉尘的浓度和可见度。型号（COAMPS）。统计结果表明，伊朗西南部粉尘事件占总尘埃事件的20％以上的主要因素是PFJ的天气模式，导致在一年的寒冷时期形成了粉尘事件。最后，天气图和卫星图像的天气分析清楚表明，PFJ在伊朗西南部寒冷时期扬尘事件形成中的有效作用。

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  • 来源
    《Air quality, atmosphere & health》 |2015年第1期|3-12|共10页
  • 作者

    Koohzad Raispour; Mahmood Khosravi; Taghi Tavousi; Mohammad Sharifikiya;

  • 作者单位

    1.Department of Physical Geography and Climatology University of Sistan and Baluchestan Zahedan Iran;

    1.Department of Physical Geography and Climatology University of Sistan and Baluchestan Zahedan Iran;

    1.Department of Physical Geography and Climatology University of Sistan and Baluchestan Zahedan Iran;

    1.Department of Physical Geography and Climatology University of Sistan and Baluchestan Zahedan Iran 2.Department of Remote Sensing University of Tarbiat Modares Tehran Iran;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dust; Jet Stream; Climatic Hazard; Iran;

    机译：灰尘;喷射流;气候危害;伊朗;

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