Long-range transport impacts on surface aerosol concentrations and the contributions to haze events in China: an HTAP2 multi-model study
Long-range transport impacts on surface aerosol concentrations and the contributions to haze events in China: an HTAP2 multi-model study
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DOI：
10.5194/acp-18-15581-2018
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发表时间：
2018-10
影响因子：
6.3
通讯作者：
Xinyi Dong;J. Fu;Qingzhao Zhu;Jian Sun;Jiani Tan;T. Keating;T. Sekiya;K. Sudo;L. Emmons
中科院分区：
文献类型：
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作者：
Xinyi Dong;J. Fu;Qingzhao Zhu;Jian Sun;Jiani Tan;T. Keating;T. Sekiya;K. Sudo;L. Emmons
抽象的。最近雾霾严重影响了中国人口密集地区。虽然许多努力都致力于调查当地人为排放的影响，但对远距离迁移的影响关注有限。在这项研究中，我们应用模拟从六个参与模式提供的半球传输的空气污染第2阶段（HTAP 2）演习，以调查欧洲（欧元）和俄罗斯-白俄罗斯-乌克兰（RBU）对东亚（EAS）的地面空气质量的长期传输的影响，特别关注他们的贡献在中国的雾霾事件。源区人为排放扰动20%的影响外推系数为5，以估计全部影响。我们发现，在雾霾事件期间，EUR和RBU的全部影响为0.99 µg m−3（3.1%）和1.32 µg m−3（4.1%），而年平均全部影响仅为0.35 µg m−3（1.7%）和0.53 µg m−3（2.6%）。通过估算大气气溶胶在边界层内和边界层上的响应，我们发现边界层内来自大气气溶胶的长距离输送贡献了EAS气溶胶响应总柱密度的22- 38%。与HTAP第一阶段评估的比较表明，从2000年到2010年，由于源区域排放减少和受体区域排放增加的同时，从欧洲到东亚的远距离迁移使表面气溶胶质量浓度显著下降了2-10倍。来自欧洲和RBU地区的长距离输送使我国灰霾日数分别增加0.15%和0.11%，华北平原和东南部地区灰霾日数增加1-3天（<3%）。本研究是首次利用多模式试验研究长距离输送对中国灰霾的贡献。
Abstract. Haze has been severely affecting the densely populated areas in China recently. While many of the efforts have been devoted to investigating the impact of local anthropogenic emission, limited attention has been paid to the contribution from long-range transport. In this study, we apply simulations from six participating models supplied through the Task Force on Hemispheric Transport of Air Pollution phase 2 (HTAP2) exercise to investigate the long-range transport impact of Europe (EUR) and Russia–Belarus–Ukraine (RBU) on the surface air quality in eastern Asia (EAS), with special focus on their contributions during the haze episodes in China. The impact of 20 % anthropogenic emission perturbation from the source region is extrapolated by a factor of 5 to estimate the full impact. We find that the full impacts from EUR and RBU are 0.99 µg m−3 (3.1 %) and 1.32 µg m−3 (4.1 %) during haze episodes, while the annual averaged full impacts are only 0.35 µg m−3 (1.7 %) and 0.53 µg m−3 (2.6 %). By estimating the aerosol response within and above the planetary boundary layer (PBL), we find that long-range transport from EUR within the PBL contributes to 22–38 % of the total column density of aerosol response in EAS. Comparison with the HTAP phase 1 (HTAP1) assessment reveals that from 2000 to 2010, the long-range transport from Europe to eastern Asia has decreased significantly by a factor of 2–10 for surface aerosol mass concentration due to the simultaneous emission reduction in source regions and emission increase in the receptor region. We also find the long-range transport from the Europe and RBU regions increases the number of haze events in China by 0.15 % and 0.11 %, and the North China Plain and southeastern China has 1–3 extra haze days (<3 %). This study is the first investigation into the contribution of long-range transport to haze in China with multi-model experiments.