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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Variation of black carbon concentration associated with rain events at a tropical urban location
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Variation of black carbon concentration associated with rain events at a tropical urban location

机译：热带城市地点与降雨事件相关的黑碳浓度变化

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摘要

Mass concentration of black carbon (BC) near the surface (within the planetary atmospheric boundary layer) was measured using a seven-channel aethalometer at Kolkata, a metropolitan city in the Indian tropical region, during the period from June 2012 to May 2013. The diurnal variation of BC concentration shows a prominent increase in the morning and evening hours, an usual feature seen over continents. However, an anomalous feature of the BC variation is observed subsequent to rain events. On normal days, the BC mass concentration during noon and early afternoon hours remains around 8000 ng/m(3) at Kolkata. However, after the occurrence of isolated thundershowers, interestingly, the BC concentration increases (rather than decreasing due to washout) and at times reaches above 20,000 ng/m(3) during noon and early afternoon hours. This increase is found to be associated with the formation of local temperature inversion within the atmospheric boundary layer during and after the occurrence of rain, which would suppress or inhibit vertical mixing and dispersion in contrast to non-rainy days. Results are presented to indicate the above-mentioned behaviour of BC concentration.
机译：在2012年6月至2013年5月期间，在印度热带地区的大都市加尔各答，使用七通道测湿仪测量了地表附近（行星大气边界层内）黑碳（BC）的质量浓度。 BC浓度的昼夜变化在早晨和傍晚显着增加，这是各大洲常见的特征。但是，在下雨事件之后，观测到了BC变化的异常特征。在正常情况下，加尔各答的正午和午后时段，BC的质量浓度保持在8000 ng / m（3）左右。但是，有趣的是，在出现孤立的雷阵雨之后，BC浓度增加（而不是由于冲洗而降低），有时在中午和午后时段达到20,000 ng / m（3）以上。发现这种增加与降雨发生期间和之后在大气边界层内局部温度反转的形成有关，与非雨天相比，这将抑制或抑制垂直混合和分散。给出结果以表明BC浓度的上述行为。

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