伴随模式在追踪污染事件重点源区中的应用

发布时间：2018-07-04 18:45

本文选题：伴随方法 + 污染个例　；参考：《中国环境科学》2017年04期

【摘要】：本研究利用GRAPES-CUACE气溶胶伴随模式,对2015年11月27日~12月2日北京市一次高浓度PM_(2.5)污染过程进行了敏感性分析,显示了伴随模式在追踪重点排放源区及关注敏感排放时段等方面的优越性.研究结果表明:本次污染事件所关注的北京市PM_(2.5)峰值浓度是北京市本地排放源和周边省市排放源共同作用的结果.从累积敏感系数来看.目标时刻前23h内,本地源贡献占主导,PM_(2.5)峰值浓度对本地排放源响应迅速,目标时刻前5h,本地源对峰值浓度的贡献达到最大,逐时敏感系数峰值为9.4μg/m~3.周边源贡献表现为周期性波动,逐时敏感系数在目标时刻前9,29,43h,出现3次峰值,分别为6.66,6.24,1.74μg/m~3,伴随着偏南风,周边源在目标时刻前1~57h内持续不断地向北京市输送污染物.不同距离的周边源对目标时刻PM_(2.5)峰值浓度的影响时段和程度不一样,目标时刻前72h内,北京、天津、河北及山西排放源对目标时刻PM_(2.5)峰值浓度的累积贡献比例分别为31%、9%、56%及4%;从逐时敏感系数来看,天津源贡献的主要时段为目标时刻前1~33h,逐时敏感系数峰值出现在目标时刻前9h,为2.10μg/m~3,山西源贡献的主要时段为目标时刻前17~33h,逐时敏感系数峰值出现在目标时刻前27h,为0.71μg/m~3,河北源贡献的主要时段为目标时刻前1~57h,逐时敏感系数呈现周期性波动,出现3次峰值,分别为4.55,5.31,1.59μg/m~3.
[Abstract]:Using GRAPES-CUACE aerosol adjoint model, the sensitivity of a high concentration PM2.5 pollution process in Beijing from November 27 to December 2, 2015 was analyzed. The advantages of the accompanying model in tracking key emission sources and paying attention to sensitive emission periods are demonstrated. The results show that the peak concentration of PM2.5 in Beijing concerned by this pollution event is the result of the interaction between the local emission sources in Beijing and the emission sources in the surrounding provinces and cities. Judging from the cumulative sensitivity coefficient. Within 23 hours before the target time, the contribution of local sources to the peak concentration of PM2.5 was rapid to the local emission sources, and the contribution of local sources to the peak concentration reached the maximum at 5 hours before the target time, and the peak value of hourly sensitivity was 9.4 渭 g / m ~ (-1). The contribution of peripheral sources fluctuated periodically, and the time-sensitive coefficient was 92943hs before the target time, with three peaks of 6.66 ~ 6.241.74 渭 g / m ~ (-3), which accompanied by the southerly wind, and the peripheral sources continuously transported pollutants to Beijing within 57 hours before the target time. The influence of peripheral sources at different distances on the peak concentration of PM2.5 at the target time is different. Within 72 hours before the target time, Beijing, Tianjin, The cumulative contribution of Hebei and Shanxi emission sources to the peak concentration of PM2.5 at the target time is 31% and 4%, respectively. The main period of Tianjin source contribution is 1 ~ 33h before the target time, the peak value of time-by-hour sensitivity coefficient appears at 9 hours before the target moment, which is 2.10 渭 g / m ~ (-3). The main period of Shanxi source's contribution is 17 ~ 33h before the target time, and the peak value of time-by-hour sensitivity coefficient appears 27 hours before the target time. It is 0.71 渭 g / mm3. The main period of Hebei source contribution is 57 h before the target time, and the hourly sensitivity coefficient fluctuates periodically. There were three peaks of 4.55 ~ 5.31 渭 g / m ~ (-1) and 1.59 渭 g / m ~ (-1) respectively.
【作者单位】：中国气象科学研究院大气成分研究所;南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室;中国气象局北京城市气象研究所;中国气象局京津冀环境气象预报预警中心;
【基金】：国家自然科学基金资助项目(41575151) 国家重点研发计划“全球变化及应对”重点专项“黑碳的农业与生活源排放对东亚气候空气质量的影响及其气候-健康效益评估”(2016YFA0602000)
【分类号】：X513

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