PM10 carbonaceous aerosols and their real-time wet scavenging during monsoon and non-monsoon seasons at Delhi, India

IF 3 4区地球科学 Q2 ENVIRONMENTAL SCIENCES

Journal of Atmospheric Chemistry Pub Date : 2019-08-21 DOI:10.1007/s10874-019-09396-z

Saurabh Sonwani, Umesh C. Kulshrestha

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引用次数: 32

Abstract

Real-time simultaneous measurements of rainwater and PM₁₀ chemistry were carried out at Delhi during the year 2016–17 in order to assess the levels of carbonaceous species and their wet scavenging during monsoon and non-monsoon seasons at Delhi. The PM₁₀ samples were collected Before Rain (BR), During Rain (DR) and After Rain (AR) events, while rainwater samples collected on an event basis. The ambient OC levels were always higher than the levels of EC during both monsoon and non-monsoon seasons in ambient aerosol as well as in rainwater. On an average, during rain (DR) 30% of OC aerosols and 28.2% of EC aerosols removed via wet scavenging process. In after rain (AR), 26.2% OC and 1.8% EC aerosols further decreased in comparison to DR samples due to the presence of OC and EC free air parcel. Overall it observed that the OC concentration significantly lowered from BR to DR and AR. However, EC concentrations in AR were found to be higher than DR samples indicating their build-up after the rains. The Scavenging Ratios (SRs) of OC and rain intensity had a significant positive correlation, whereas the SRs of EC showed a weak correlation with rain intensity. The SRs of EC were significantly higher during non-monsoon as compared to monsoon season. Such characteristics can be explained based on the particles size, source and the hygroscopicity of both types of carbonaceous aerosol.

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印度德里季风和非季风季节PM10碳质气溶胶及其实时湿清除

2016 - 2017年，为了评估德里季风和非季风季节含碳物种的水平及其对湿的清除能力，在德里进行了雨水和PM10化学的实时同步测量。PM10样品采集于雨前(BR)、雨中(DR)和雨后(AR)事件，雨水样品采集于事件基础上。在季风和非季风季节，大气气溶胶和雨水中的大气OC含量均高于大气EC含量。平均而言，在降雨(DR)期间，30%的OC气溶胶和28.2%的EC气溶胶通过湿清除过程被去除。在雨后(AR)，由于存在OC和EC自由空气包裹，与DR样品相比，26.2%的OC和1.8%的EC气溶胶进一步减少。总体而言，从BR到DR和AR的OC浓度显著降低。然而，AR样品中的EC浓度高于DR样品，表明它们在降雨后积聚。有机碳清除率(SRs)与雨强呈显著正相关，而有机碳清除率与雨强呈弱相关。非季风季节EC的SRs明显高于季风季节。这种特性可以根据两类含碳气溶胶的颗粒大小、来源和吸湿性来解释。

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来源期刊

Journal of Atmospheric Chemistry 地学-环境科学

CiteScore

4.60

自引率

5.00%

发文量

审稿时长

7.5 months

期刊介绍： The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.