“两湖盆地”秋季黑碳气溶胶的分布及来源特征
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国家重点研发计划项目(2016YFA0602003);国家自然科学基金资助项目(41830965);中国博士后基金面上项目(2019M662169);国家自然科学基金青年项目(41905114)


Distribution and source characteristics of Black carbon in autumn over “Hunan-Hubei basin”, China
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    摘要:

    应用耦合了黑碳(Black Carbon,BC)区域源追踪方法的中尺度天气-化学模式(WRF-Chem),对位于长江中游的湖南湖北盆地(以下简称两湖盆地)秋季(2015年10月)黑碳的分布、区域来源和日变化特征进行研究。结果表明,由于两湖盆地所处地理位置及地形的特殊性,在不同的风场条件下,本地源和外来源对两湖盆地BC的贡献占比变化较大。两湖盆地秋季BC的来源主要有3种情形:1)北风控制下的传输型:地面风速大,BC质量浓度相对低,上风向源对两湖盆地近地面BC的贡献占比达30.6%,其中汾渭地区的贡献最大,本地源的贡献占比为61.7%。2)地面风速小、大气稳定条件下的静稳型:近地面BC质量浓度高,本地源的贡献占比高达79.6%。3)东北风控制下的传输型:本地源和外来源的贡献共同使得两湖盆地BC维持较高质量浓度,本地源的贡献占比为64.1%,外来源的贡献主要包括安徽省、汾渭地区及长江三角洲的输送。在垂直方向上,传输型的本地源贡献占比仅在300 m以下较高;静稳型的本地源贡献占比较高,可延伸到1 500 m以上(本地源的贡献占比在近地面约为75%、至1 500 m约为50%)。在日变化上,本地源与外来源对两湖盆地BC的贡献占比呈相反变化,夜间和早间本地源的贡献占比较高而外来源的贡献占比较低,午后本地源的贡献占比减小而外来源的贡献占比明显增大;相对静稳型而言,传输型的这一日变化特征更为显著。

    Abstract:

    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(Hunan-Hubei) basin in the middle reaches of the Yangtze river. The results show that, the contribution of local source and outside sources to BC at "Hunan-Hubei" varied greatly under different wind field conditions. In this study, there are three main BC source episodes in autumn in "Hunan-Hubei":(1)The type of import mainly controlled by north wind, with high wind speed and low BC concentration. The contribution to surface BC in "Hunan-Hubei" from upwind regions via transport was approximately 30.6%, and 61.7% from local source regions; (2)The type of stable under the condition of low surface wind speed and stable weather. The contribution of local BC was high, accounting for 79.6%; (3)The type of import mainly controlled by northeasterly wind. A high concentration of BC in "Hunan-Hubei" 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 300 m. Under the type of stable, the dominant contribution from local sources can be keep to more than 1 500 m(local source accounts for about 75% on surface and 50% at 1 500 m). In terms of diurnal variation, the change of contribution proportions of local and outside sources to BC in "Hunan-Hubei" 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.

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  • 收稿日期:2020-04-22
  • 最后修改日期:2020-05-03
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  • 在线发布日期: 2020-08-31

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