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首页> 外文期刊>International journal of remote sensing >Sulphur dioxide loadings over megacity Lahore (Pakistan) and adjoining region of Indo-Gangetic Basin
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Sulphur dioxide loadings over megacity Lahore (Pakistan) and adjoining region of Indo-Gangetic Basin

机译:大城市拉合尔(巴基斯坦)及印度恒河盆地毗邻地区的二氧化硫负荷

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摘要

This article presents spatial and temporal variations of planetary boundary layer (PBL) sulphur dioxide (SO2) over megacity Lahore and adjoining region, a typical representative area in the Indo-Gangetic Basin (IGB) largely influenced by transported volcanic SO2 from Africa, Middle East, and southern Europe, by using data retrieved from satellite-based Ozone Monitoring Instrument (OMI) during October 2004-September 2015. We find a positive trend of 2.4% per year (slope 0.01 +/- 0.005 with y-intercept 0.35 +/- 0.03 Dobson Unit (DU), correlation coefficient r = 0.55 and 2-tailed p-value at 0.1) of OMI-SO2 column with the average value of 0.4 +/- 0.05 DU. Strong seasonality of OMI-SO2 column is observed over the region linked with local meteorology, patterns of anthropogenic emissions, crop residue burning, and vegetation cover. There exists a seasonal high value in winter 0.56 +/- 0.24 DU with a peak in December 0.67 +/- 0.26 DU. The seasonal lowest value is observed to be 0.29 +/- 0.11 DU in wet summer with minimum value in July 0.25 +/- 0.06 DU. High growth rates of OMI-SO2 column over the study region have been observed in January, June, October, and December ranging from 5.7% to 11.6% per year. Satellite data show elevated OMI-SO2 columns in 2007, 2008, 2011, and 2012 largely contributed by trans-boundary volcanic SO2. A detailed analysis of volcanic SO2 transported from Africa and Middle East (Jabal Al-Tair, Dalaffilla, and Nabro volcanoes) over the study area is presented. Air mass trajectories suggest the presence of long-range transported volcanic SO2 at high altitude levels over Lahore and IGB region during the volcanic episodes. The SO2 enhancements in PBL during winter season are generally due to significant vertical downdraft of high-altitude volcanic SO2. For the first time, we present significant influence of volcanic SO2 from southern Europe (Mt. Etna volcano) reaching over the study area. Daily mean OMI-SO2 levels up to 21.4, 10.0, 5.6, and 2.4 DU have been noticed due to the eruptions from Dalaffilla, Mt. Etna, Nabro, and Jabal Al-Tair volcanoes, respectively.
机译:本文介绍了大城市拉合尔及其毗邻地区的行星边界层(PBL)二氧化硫(SO2)的时空变化,这是印度恒河盆地(IGB)的典型代表区域,受非洲,中东地区运来的火山岩SO2的影响很大,以及欧洲南部地区,通过使用2004年10月至2015年9月从卫星臭氧监测仪(OMI)检索到的数据。我们发现每年有2.4%的正趋势(y截距为0.01 +/- 0.005,y截距为0.35 + / -0.03 Dobson单位(DU),相关系数r = 0.55,OMI-SO2色谱柱的2尾p值在0.1),平均值为0.4 +/- 0.05 DU。在该地区观察到OMI-SO2柱的强烈季节性,这与当地气象,人为排放模式,作物残渣燃烧和植被覆盖有关。冬季有0.56 +/- 0.24 DU的季节性高值,12月有0.67 +/- 0.26 DU的峰值。在湿润的夏季,季节性最小值为0.29 +/- 0.11 DU,7月的最小值为0.25 +/- 0.06 DU。在研究区域内,OMI-SO2色谱柱在1月,6月,10月和12月的高增长率每年从5.7%到11.6%不等。卫星数据显示,2007年,2008年,2011年和2012年OMI-SO2柱的升高主要来自跨界火山岩SO2。本文详细介绍了从非洲和中东(Jabal Al-Tair,Dalaffilla和Nabro火山)运来的火山SO2。空气轨迹表明,在火山爆发期间,在拉合尔和IGB地区的高海拔地区存在远距离运输的火山SO2。冬季PBL中SO2的增加通常归因于高海拔火山岩SO2的垂直垂降。第一次,我们展示了来自南欧的火山SO2(埃特纳火山)到达研究区域的重大影响。由于来自达拉菲拉山的喷发,每日平均OMI-SO2水平高达21.4、10.0、5.6和2.4 DU。埃特纳火山,纳布罗火山和贾巴尔铝塔尔火山。

著录项

  • 来源
    《International journal of remote sensing》 |2016年第14期|3021-3041|共21页
  • 作者单位

    Univ Punjab, Dept Space Sci, Remote Sensing & GIS Grp, New Campus, Lahore 54590, Pakistan;

    Univ Punjab, Dept Space Sci, Remote Sensing & GIS Grp, New Campus, Lahore 54590, Pakistan;

    Univ Punjab, Dept Space Sci, Remote Sensing & GIS Grp, New Campus, Lahore 54590, Pakistan;

    Univ Punjab, Dept Space Sci, Remote Sensing & GIS Grp, New Campus, Lahore 54590, Pakistan;

    Univ Punjab, Dept Space Sci, Remote Sensing & GIS Grp, New Campus, Lahore 54590, Pakistan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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