Atmospheric molecular hydrogen (H-2) at the Shangdianzi regional background station in China
Atmospheric molecular hydrogen (H-2) at the Shangdianzi regional background station in China
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中国上甸子区域本底站大气分子氢（H-2）
DOI：
10.1016/j.atmosenv.2016.09.044
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发表时间：
2016
影响因子：
5
通讯作者：
Zhou Huaigang
中科院分区：
文献类型：
--
作者：
Luan Tian;Fang Shuangxi;Yao Bo;Wang Hongyang;Dong Fan;Shi Qingfeng;Zhou Liyan;Zhou Huaigang
在中国上甸子区域站连续测量了大气分子氢（H2）摩尔分数。利用2015年1月至2016年4月的大气H2时间序列，分析了H2的日变化和季节变化，以及气象因子对观测值的影响。在观测期间，上店子的大气H2摩尔分数从最低的381 ppb（十亿分之一，10− 9干空气摩尔分数）到最高的1535 ppb不等，中位数为510 ppb，平均值（±标准差）为555 ± 113 ppb。结果表明，上店子地区H2摩尔分数受当地源汇的影响较大。区域代表性条件占总记录的44.7%，平均摩尔分数为488 ± 20 ppb。最高的区域代表性的H2摩尔分数观察到在7月，而最低的观察到在10月。季节性周期中的峰谷振幅为63 ± 3 ppb。H2摩尔分数在所有季节都表现为夜间消耗，早晨（当地时间7：00-10：00）最低。上店子的H2摩尔分数还受当地地面风向的影响。来自NW-NNW-N-NNE-NE-ENE-E方向的风总是与大气H2负荷的负贡献相关联，而来自SSW-SW-WSW-W方向的风通常增强H2值。轨迹聚类分析的结果表明，从偏南方向的空气质量引起高的H2摩尔分数。相反，平均H2摩尔分数低时，空气质量是从北，西北和东方向。
Atmospheric molecular hydrogen (H2) mole fractions have been continuously measured at the Shangdianzi regional station in China. In this study, we present the atmospheric H2time series from January 2015 to April 2016, and investigate the diurnal and seasonal cycles, and the impact of meteorological factors on the observed values. Atmospheric H2mole fractions at Shangdianzi vary from a minimum of 381 ppb (parts per billion, 10−9dry air mole fraction) to a maximum of 1535 ppb, with a median of 510 ppb and a mean (± standard deviation) of 555 ± 113 ppb during the observation period. The results indicate that H2mole fractions at Shangdianzi are frequently influenced by local sources and sinks. Regionally representative conditions account for 44.7% of the total records with a mean mole fraction of 488 ± 20 ppb. The highest regionally representative H2mole fraction is observed in July, while the lowest is observed in October. Peak-to-trough amplitude in the seasonal cycle is 63 ± 3 ppb. H2mole fractions show nighttime depletion in all seasons, with the lowest values in the morning (7:00–10:00 local time). The H2mole fractions are also influenced by local surface wind direction at Shangdianzi. Winds from NW-NNW-N-NNE-NE-ENE-E directions are always associated with negative contribution to atmospheric H2loading, whereas winds from SSW-SW-WSW-W directions generally enhance the H2values. The results of trajectory clustering analysis demonstrate that air masses from a southerly direction induce high H2mole fractions. Conversely, mean H2mole fractions are low when air masses are from the north, northwest, and east directions.