Measurement and analysis of black carbon aerosols over a tropical semi-arid station in Kadapa, India
Measurement and analysis of black carbon aerosols over a tropical semi-arid station in Kadapa, India
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DOI：
10.1016/j.atmosres.2015.12.014
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发表时间：
2016-05-01
影响因子：
5.5
通讯作者：
Reddy, R. R.
中科院分区：
文献类型：
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作者：
Begam, G. Reshma;Vachaspati, C. Viswanath;Reddy, R. R.
本文介绍了使用七通道空气浓度计 (AE-42) 进行的气溶胶光吸收测量，该测量是 2011 年 9 月至 2012 年 11 月在印度卡达帕热带半干旱地区记录的。研究期间黑碳(BC)质量浓度([BC])年均值为2.20+/-0.78μg·m(-3)，与其他类似环境地点相比一致。观测到强烈的季节变化，冬季值较高（2.87+/-0.81μg·m（-3）），季风季节较低（1.30+/-031μg·m（-3）），这可能归因于区域天气气象和远距离输送。 [BC]日变化的两个峰值出现在早上 06:00 至 08:00 当地时间 (LT) 之间和晚上 19:00-21:00 LT 左右，最小峰值出现在下午（类似于 16:00 LT），这与边界层动态、当地和区域来源以及相关气象密切相关。还分析了测量的 [BC] 与研究区域相应气象参数之间的关系。估计的月平均光谱吸收系数值范围为 0.56 至 1.15，平均值为 0.90，这表明 BC/OC 比率较高，气溶胶的可能排放源是化石燃料燃烧。轨迹聚类分析显示，在研究期间，BC 气溶胶向观测地点的远距离输送产生了显着影响。 (C) 2015 Elsevier B.V. 保留所有权利。
This paper presents aerosol light absorption measurements using a seven channel Aethalometer (AE-42), recorded during September 2011-November 2012 over a tropical semi-arid site in Kadapa, India. The annual average black carbon (BC) mass concentration ([BC]) during the studied period was 2.20 +/- 0.78 mu g m(-3) which is in agreement when compared to other sites of similar environment. Strong seasonal variation was observed with high values during winter (2.87 +/- 0.81 mu g m(-3)) and low in monsoon (1.30 +/- 031 mu g m(-3)) season, which could be attributed to regional synoptic meteorology and long range transport. The two peaks in diurnal variations of [BC] were observed during morning between 06:00 and 08:00 h local time (LT) and in the evening around 19:00-21:00 h LT, with a minimum peak in the afternoon (similar to 16:00 h LT) which is strongly correlated with the boundary layer dynamics, local and regional sources, and associated meteorology. The relationships between measured [BC] and the corresponding meteorological parameters for the studied region were also analysed. The estimated monthly mean spectral absorption coefficient values range from 0.56 to 1.15 with an average of 0.90, which suggests high BC/OC ratio and possible source of emission of aerosols is fossil fuel burning. Trajectory cluster analysis showed significant impact of long range transport of BC aerosols towards the observational site during the period of study. (C) 2015 Elsevier B.V. All rights reserved.