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.

中文翻译：

---

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

2016-17 年期间在德里进行了雨水和 PM10 化学的实时同步测量，以评估德里季风和非季风季节期间碳质物种的水平及其湿清除。PM10 样本是在雨前 (BR)、雨中 (DR) 和雨后 (AR) 事件中收集的，而雨水样本是在事件基础上收集的。在季风和非季风季节，环境气溶胶和雨水中的环境 OC 水平始终高于 EC 水平。平均而言，在下雨 (DR) 期间，30% 的 OC 气溶胶和 28.2% 的 EC 气溶胶通过湿清除过程去除。在雨后 (AR) 中，由于 OC 和 EC 游离空气包裹的存在，与 DR 样品相比，26.2% OC 和 1.8% EC 气溶胶进一步减少。总的来说，观察到 OC 浓度从 BR 到 DR 和 AR 显着降低。然而，发现 AR 中的 EC 浓度高于 DR 样品，表明它们在雨后积累。OC的清除率（SRs）与降雨强度呈显着正相关，而EC的SRs与降雨强度呈弱相关。与季风季节相比，非季风季节 EC 的 SR 显着更高。这些特性可以根据两种类型的碳质气溶胶的粒径、来源和吸湿性来解释。而EC的SRs与降雨强度的相关性较弱。与季风季节相比，非季风季节 EC 的 SR 显着更高。这些特性可以根据两种类型的碳质气溶胶的粒径、来源和吸湿性来解释。而EC的SRs与降雨强度的相关性较弱。与季风季节相比，非季风季节 EC 的 SR 显着更高。这些特性可以根据两种类型的碳质气溶胶的粒径、来源和吸湿性来解释。