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首页> 外文期刊>Atmospheric environment >Continental export efficiencies and delineation of sources for trace gases and black carbon in North-East India: Seasonal variability
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Continental export efficiencies and delineation of sources for trace gases and black carbon in North-East India: Seasonal variability

机译：印度东北部的大陆出口效率和痕量气体和黑碳的来源划分：季节性变化

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The Indo Gangetic Plain (IGP) has been identified from back-trajectory analyses, as one of the most potential region affecting the species transport to the Northeastern region of India (NER). The continental export efficiency (epsilon epsilon) of BC, NOx and SO2 within the boundary layer is estimated in order to examine how efficiently these chemical species are transported towards the NER. For this the measurements carried out at Dibrugarh, a wet tropical location in NER during 2012-2013 have been used as the references in the estimation of the species enhancements above their background. CO is used as a passive tracer of transport due to its longer lifetime in the atmosphere. The emission estimates of BC, NOx, SO2 and CO in the IGP region are adopted from the emission inventories REAS and INTEX-B. The estimated export efficiency is highest in winter (DJF) for BC and NOx, whereas SO2 shows maximum efficiency in monsoon (JJAS). BC due to efficient transportation/removal from the IGP region exhibits highest epsilon epsilon values compared to the other species. NOx, and SO2 on the other hand get transformed to other chemical species shortly after emission into the atmosphere and hence are less efficiently transported towards the study region. The export of BC, CO, NOx, and SO2 are expected to supplement the chemical atmosphere in NER, which is further studied through the annual variability in their distribution in Dibrugarh. Pearson correlation analyses of BC, NOx, and SO2 with CO is carried out to examine the similarity or dissimilarity among the sources. (C) 2015 Elsevier Ltd. All rights reserved.
机译：通过反向轨迹分析已经确定了印度恒河平原（IGP），它是影响物种向印度东北地区（NER）迁移的最有潜力的地区之一。估算边界层内BC，NOx和SO2的大陆出口效率（εε），以便检查这些化学物质向NER传输的效率。为此，在2012-2013年期间在NER的热带湿润地点Dibrugarh进行的测量已被用作估算高于其背景的物种增强的参考。由于CO在大气中的使用寿命更长，因此它被用作被动示踪剂。 IGP区域中的BC，NOx，SO2和CO的排放估算是根据排放清单REAS和INTEX-B得出的。 BC和NOx的估计出口效率在冬季（DJF）最高，而SO2在季风（JJAS）方面显示最大效率。与其他物种相比，由于从IGP地区高效运输/撤出的卑诗省表现出最高的ε值。另一方面，NOx和SO2在排放到大气中后不久便转化为其他化学物质，因此向研究区域的传输效率较低。预计BC，CO，NOx和SO2的出口将补充NER中的化学气氛，这将通过其在Dibrugarh中分布的年度变化来进一步研究。进行了BC，NOx和SO2与CO的Pearson相关分析，以检查这些源之间的相似性或不相似性。 （C）2015 Elsevier Ltd.保留所有权利。

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