长江中游“两湖盆地”秋季黑碳分布和来源特征研究
投稿时间:2020-04-22  修订日期:2020-05-01  点此下载全文
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作者单位E-mail
朱彬 南京信息工程大学大气物理学院 binzhu@nuist.edu.cn 
王媛敏 南京信息工程大学大气物理学院  
高晋徽 南方科技大学海洋科学与工程系  
赵天良 南京信息工程大学大气物理学院  
王伶瑞 南京信息工程大学大气物理学院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:本文应用耦合了黑碳区域源追踪方法的中尺度天气-化学模式(WRF-Chem),对长江中游的湖南湖北盆地地区(两湖)秋季(15年10月)的黑碳(BC)分布、区域来源和日变化特征开展研究。结果表明,由于两湖所处的地理位置和地形,在不同的风场条件下,本地源和外来源对两湖BC的贡献占比变化较大。本研究中,两湖秋季BC主要的三种来源情形有:1)北风控制下的传输型:地面风速大,BC浓度相对低,上风向源对两湖近地面BC贡献占比达30.6%,其中汾渭地区的贡献最大,本地源平均贡献61.7%。2)地面风速小、大气稳定条件下的静稳型:近地面BC浓度高,本地源贡献占比高达79.6%。3)东北风控制的传输型:本地源和外来源贡献共同使得两湖BC维持较高浓度,本地源贡献占比为64.1%,外来源贡献主要包括安徽、汾渭、长三角的输送。在垂直方向上,传输型的BC来源,两湖本地源的BC贡献仅在近地面几百米占比较高。静稳型中,本地源为主导可延伸到1500m以上(地表至1500m,75%-50%)。日变化上,本地源与外部输送对两湖BC的贡献占比呈相反变化,夜间和早间本地贡献占比较高而外来传输贡献较小,午后本地贡献占比减小而外来传输的贡献明显增强,传输型的此变化特征更为明显。本研究结果可为两湖地区环境空气质量评估和污染调控提供科学依据。
中文关键词:WRF-chem  源追踪  黑碳气溶胶  湖南湖北
 
Reaserch?on?the?source?of?Black?Carbon?in?autumn?over?hunan and?hubei,China
Abstract:In this study, the Weather Research and Forecasting model coupled to Chemistry (WRF-Chem model), coupled with an online BC source-tagging method, was used to study on the distribution, regional sources and diurnal variation of black carbon (BC) in autumn of October 2015 of Hunan and Hubei (two lakes) basin in the middle reaches of the Yangtze river. The results show that, the contribution of local source and outside sources to BC at “two lakes” varied greatly under different wind field conditions. In this study, there are three main BC-source episodes in autumn in “two lakes”: (1) The type of import mainly controlled by north wind, with high wind speed and low BC concentration. The contribution to surface BC in “two lakes” from upwind regions via transport were approximately 30.6%, and 61.7% from local source regions; (2) The type of stability under the condition of low surface wind speed and stable weather. The contribution of local BC was much high, accounting for 79.6%; (3) The type of import mainly controlled by northeasterly wind. A high concentrations of BC in “two lakes” was maintained by the contributions from local and outside sources together, and the contribution of local sources was 64.1%. The contribution of outside sources mainly included the transport from Anhui, Shanxi-Shaanxi-Henan and Yangtze river delta. In the vertical direction, in the type of import, the local contribution to BC were mainly dominant under the several hundred meters near the surface. In type of stability, the dominant contribution from local sources can be keep to more than 1500m (surface to 1500m, 75% to 50%). In terms of diurnal variation, the change of contribution?proportions?of local and outside sources to BC in “two lakes” was opposite. The proportion of local contribution remained high in the morning and night, while the contribution of external transport was low. In the afternoon, the local contribution decreased, while the contributions from outside was significantly enhanced. In the type of import, this feature of diurnal variation is more obvious. The results of this study can provide scientific basis for air quality assessment and pollution control in the “two lakes”.
keywords:WRF-chem  Source tagging  Black carbon  Hunan-Hubei
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