Robustness of the aerosol weekly cycle over Southeastern China
Robustness of the aerosol weekly cycle over Southeastern China
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中国东南部气溶胶周周期的稳健性
DOI：
10.1016/j.atmosenv.2012.07.029
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发表时间：
2012-12-01
影响因子：
5
通讯作者：
Guo, Yuanxi
中科院分区：
文献类型：
--
作者：
Wang, Wenshan;Gong, Daoyi;Guo, Yuanxi
7天周期是一种特殊的时间尺度，与每周的工作时间表相对应。然而，气溶胶负荷的周周期的存在并没有达成共识，这与人类活动密切相关。在本研究中，我们分析了PM10（直径小于10 pm的颗粒物）的表面浓度和其他物理相关的变量在中国东南部平静的天气条件下，以检测气溶胶负载每周周期的迹象。结果表明，PM10的周周期明显，最大值出现在周四，最小值出现在周六和周日。这个循环的范围超过8 μ g m（-3），约为日平均值的8%。与6天和8天周期相比，7天周期的显著幅度以及蒙特-卡罗检验的显著结果支持PM 10周周期的存在。调整后的水平能见度、二氧化硫（SO2）和二氧化氮（NO2）等直接相关的变量也存在明显的周周期，这些周期的模式与PM10的模式相对应。分析了总云量和相对湿度在周时间尺度上的变化，并讨论了与PM10的关系。降水和风对大气气溶胶的半直接影响可能是通过PM10的变化来实现云量周循环的。(C)2012爱思唯尔有限公司保留所有权利。
A 7-day cycle is a special time-scale that corresponds with the weekly working schedule. However, there is no consensus on the existence of the weekly cycle of aerosol loading, which is closely related to human activities. In the present study, we analyzed the surface concentration of PM10 (Particulate Matter with a diameter of less than 10 pm) and other physically linked variables over Southeastern China under calm weather conditions to detect signs of the aerosol loading weekly cycle. Results show that the weekly cycle of PM10 is distinct; the maximum occurs on Thursday and the minimum occurs on Saturday and Sunday. The range of this cycle is over 8 mu g m(-3), approximately 8% of the daily average. The existence of the PM10 weekly cycle was supported by the pronounced amplitude of the 7-day cycle compared with those of 6-day and 8-day cycles and by significant results from the Monte-Carlo test. There are also distinct weekly cycles in the directly linked variables of adjusted horizontal visibility, sulfur dioxide (SO2) and nitrogen dioxide (NO2); the patterns of these cycles are corresponding with that of PM10. The changes of total cloud cover and relative humidity on the weekly time-scale were analyzed, and the relationship with PM10 was discussed. It is likely that the cloud cover weekly cycle is conducted by the change of PM10 through the semi-direct aerosol effect We also found that precipitation and wind might weaken the PM10 weekly cycle by scavenging the heavy aerosol loading. (C) 2012 Elsevier Ltd. All rights reserved.