Transport characteristics and origins of carbon monoxide and ozone in Hong Kong, South China
Transport characteristics and origins of carbon monoxide and ozone in Hong Kong, South China
复制标题
华南香港一氧化碳和臭氧的输送特征及来源
DOI：
10.1002/jgrd.50714
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发表时间：
2013-08-27
影响因子：
4.4
通讯作者：
Fu, Congbin
中科院分区：
文献类型：
--
作者：
Ding, Aijun;Wang, Tao;Fu, Congbin
利用后向拉格朗日粒子扩散模型（LPDM）和2005-2007年在华南鹤咀区域本底站的观测数据，研究了一氧化碳（CO）和臭氧（O3）输运特征和来源。LPDM是使用由全球数据同化系统（GDAS）数据和CO排放清单驱动的混合单粒子拉格朗日积分轨道模型（HYSPLIT）进行的。LPDM模拟在3年期间在季节和天气尺度上表征CO的时间变化方面表现出非常好的性能。基于LPDM模式的模拟结果，研究了CO的源区和输运年龄的季节变化。本底站的CO主要来源于华南沿海地区和华东地区，平均输送时间分别约为1天和2-4天。秋季O3年最大值受来自中国东部的O3前体物区域输送的影响，表明存在较强的大陆外流及其区域影响。光化学过程导致O3事件的发生，白天O3峰值来自香港和珠江三角洲地区的新鲜次区域排放，与内陆大陆空气混合。通过研究O3-CO关系和拉格朗日输送时间，我们还研究了鹤咀不同季节的输送和光化学过程的作用。这项研究展示了后向LPDM在观测数据分析以及理解CO和O3的源受体关系和多尺度传输方面的独特应用。
Transport characteristics and origins of carbon monoxide (CO) and ozone (O3) transported to Hong Kong were investigated using backward Lagrangian particle dispersion modeling (LPDM) and measurement data collected at a regional background station, Hok Tsui, in South China during 2005–2007. LPDM was conducted using the Hybrid Single‐Particle Lagrangian Integrated Trajectory model (HYSPLIT) driven by Global Data Assimilation System (GDAS) data and emission inventories of CO. The LPDM simulations showed very good performance in characterizing temporal variations in CO on both seasonal and synoptic scales during the 3 years. Based on the LPDM simulations, the seasonal cycles of the source origins and transport age of CO were investigated. Carbon monoxide at the background station was found to originate mainly from the coastal regions in southern China and from eastern China, with averaged transport time of about 1 day and 2–4 days, respectively. The O3 annual maximum in autumn was influenced by regional transport of O3 precursors originating from eastern China, suggesting a strong continental outflow and its regional impacts. Photochemical processes contributed to occurrence of O3 episodes with sharp daytime O3 peaks produced from fresh subregional emissions from Hong Kong and the Pearl River Delta region, mixed with inland continental air. By examining the O3‐CO relationship and Lagrangian transport time, the roles of transport and photochemical processes in different seasons at Hok Tsui were also investigated. This study demonstrated unique applications of backward LPDM in observational data analysis as well as in understanding source‐receptor relationships and multiscale transport of CO and O3.