Song Lilai, Bi Xiaohui, Zhang Ziyi, Li Linxuan, Dai Qili, Zhang Wenhui, Li Hu, Wang Xuehan, Liang Danni, Feng Yinchang
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin 300350, China.
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin 300350, China.
Sci Total Environ. 2022 Jun 15;825:153980. doi: 10.1016/j.scitotenv.2022.153980. Epub 2022 Feb 22.
Sand and dust storms (SDS) frequently hit northern China and adversely impact both environment and health. The carbonaceous components, inorganic elements, water-soluble ions, and meteorological parameters of several severe SDS episodes have been measured in a supersite in Tianjin, which is a big and representative city located in SDS transmission pathway in northern China. Six SDS episodes were identified in Spring, 2021. The maximum PM mass concentration was 2684 and 1664 μg/m in SDS1 and SDS3, respectively. North and northwest wind was dominant and significant differences were found in wind speed and RH between the SDS and non-SDS episodes. North dust from Inner Mongolia and Mongolia was determined by back trajectory analysis as the probable source region. The mass concentration of SO, NO, and NH decreased in PM. Increase of Na and K and low SO/ SO indicate dust source for short length SDS transmission in northern China. The ratio of elements could also be used to distinguish SDS and non-SDS episodes identify north and northwest source for the SDS episodes. Pb/Al, Zn/Al, and Si/Al could be regarded as indicators for SDS and non-SDS episodes, Ca/Al and Ca/Si can help to indicate SDS source direction. This study provides a variety of evidences for the dust source identification and reveals the characteristics of the most severe SDS episodes of the decade in Tianjin during Spring 2021.
沙尘暴频繁袭击中国北方，对环境和健康均产生不利影响。在中国北方沙尘暴传输路径上的一个具有代表性的大城市天津的一个超级站点，对几次严重沙尘暴事件的碳质成分、无机元素、水溶性离子和气象参数进行了测量。2021年春季共识别出6次沙尘暴事件。在沙尘暴事件1和沙尘暴事件3中，PM质量浓度最大值分别为2684和1664μg/m³。北风和西北风为主导风向，沙尘暴事件和非沙尘暴事件之间的风速和相对湿度存在显著差异。通过后向轨迹分析确定来自内蒙古和蒙古国的北部沙尘为可能的源区。PM中SO₂、NO₂和NH₃的质量浓度下降。Na⁺和K⁺增加以及低SO₄²⁻/SO₂表明中国北方短距离沙尘暴传输的沙尘源。元素比值也可用于区分沙尘暴事件和非沙尘暴事件，识别沙尘暴事件的北部和西北部源区。Pb/Al、Zn/Al和Si/Al可被视为沙尘暴事件和非沙尘暴事件的指标，Ca/Al和Ca/Si有助于指示沙尘暴源方向。本研究为沙尘源识别提供了多种证据，并揭示了2021年春季天津十年来最严重沙尘暴事件的特征。
