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南京师范大学环境学院谢旻教授团队EST|大气污染防治行动计划实施前后PM₂.₅、O₃和CO₂之间的相互作用对东亚夏季风气候的不同影响

  • 2026-04-03 19:15:31
南京师范大学环境学院谢旻教授团队EST|大气污染防治行动计划实施前后PM₂.₅、O₃和CO₂之间的相互作用对东亚夏季风气候的不同影响

文章信息

第一作者:马丹阳 博士

通讯作者:谢旻 教授/博导

通讯单位:南京师范大学环境学院

https://doi.org/10.1021/acs.est.5c10279

亮点

• 大气污染成分(PM₂.₅、O₃)和温室气体(CO₂)之间的相互作用显著影响东亚夏季风(EASM)气候。

• 相互作用在2013年前削弱了EASM ,在2013后增强了EASM。

研究进展

2013年《大气污染防治行动计划》实施,东亚地区的PM₂.₅、O₃和CO₂浓度发生显著变化,三者之间的相互作用强度亦随之明显调整,进而改变了其对东亚夏季风(EASM)气候的影响。本研究基于区域气候–化学–生态耦合模式 RegCM-Chem-YIBs,系统分析了2008–2018年PM₂.₅ 、O₃和CO₂之间的相互作用对EASM气候的影响。结果表明,在 2008–2012年,考虑三者之间的相互作用使东亚近地面向下短波辐射通量减少约20–30 W/m²,近地面温度降低约0.5–1 K,从而显著削弱了EASM强度。相比之下,在2014–2018年,华北和东南地区近地面向下短波与长波辐射通量分别增加约2–4 W/m²和2–8 W/m²,导致近地面温度升高约0.5–1 K,进而增强了EASM(图1)。

图1 不同时期PM₂.₅、O₃和CO₂之间的相互作用对东亚夏季风气候的相反影响

异戊二烯是BVOCs的主要组分。如图2所示,在相互作用影响下,2008–2012年东亚地区异戊二烯浓度整体呈上升趋势,增幅约为8–18 μg/m³。这一变化主要归因于较高的PM₂.₅浓度对植被BVOC排放的促进作用。随着O₃浓度逐年升高,其对植被的氧化损伤效应逐步增强,从而抑制BVOCs排放,导致异戊二烯浓度的增幅逐年减小。近地面PM₂.₅浓度变化趋势与异戊二烯基本一致,整体呈增加趋势,但增幅亦随时间减弱。异戊二烯浓度的显著上升有利于近地面O₃的生成,而PM₂.₅浓度增加通过削弱光化学反应速率对O₃生成产生抑制作用。在两者综合影响下,2008–2012年近地面O₃浓度总体增加约2–4 ppb。相比之下,2014–2018年中国东部地区近地面O₃浓度增加更为显著,增幅约为2–6 ppb。CO₂浓度变化趋势与O₃基本一致。2008–2012年CO₂浓度增加约3–5 ppm;而在2014–2018年,O₃增幅最大的华北地区CO₂浓度最高可增加约6 ppm。

图2 不同时期PM₂.₅、O₃和CO₂之间的相互作用对东亚地区异戊二烯、PM₂.₅、O₃和CO₂浓度的影响

PM₂.₅、O₃和CO₂浓度变化通过调节大气辐射收支显著影响近地面温度。近地面向下短波辐射通量的空间分布与PM₂.₅浓度变化呈显著负相关关系。2008–2012年,受增加的PM₂.₅浓度影响,东亚地区近地面向下短波辐射通量减少约10–20 W/m²,长波辐射通量减少约2–8 W/m²,导致中国大部分地区近地面温度降低约0.5–1 K。2014–2018年,随着PM₂.₅浓度整体下降,短波辐射通量减弱趋势明显缓解,东亚大部分地区近地面向下短波辐射减少约4–12 W/m²;在华北和西南等PM₂.₅ 显著下降区域,短波辐射通量则相应增加约8 W/m²。同时,伴随短波辐射增强及O₃和CO₂浓度升高,长波辐射通量出现一定幅度的增加。2014–2018年中国中部和南部地区长波辐射通量增加约2–8 W/m²,进而使近地面温度普遍升高约0.5–1 K(图3)。

图3 不同时期PM₂.₅、O₃和CO₂之间的相互作用对东亚地区地表净向下短波辐射通量、长波辐射通量及近地面温度的影响

图4表明,2008–2012年中国大部分地区的显著降温削弱了海陆热力差异,导致偏北风和偏西风增强约0.2–0.5 m/s。同时,中国西南地区的局地增温(图3g)强化了低层偏南气流。增强的偏南风将水汽输送至更北区域,并与华北地区增强的偏北风在中高纬度地区辐合,进而促进云量增加约6–10%,降水增强约4–8 mm/d。相比之下,2014–2018年中国北部和南部地区出现明显升温,增强了海陆热力差异,进而强化东亚夏季风环流。受此影响,中国东部和东北地区低层偏东风和偏南风增强约0.5–1 m/s。增强的偏南与偏东气流输送更多水汽,导致云量增加约6–12%,降水增强约4–10 m/s。

图4 不同时期PM₂.₅、O₃和CO₂之间的相互作用对东亚地区850hPa风场、云量及降水的影响

图5表明,在PM₂.₅、O₃和CO₂相互作用的影响下,东亚夏季风指数由2008–2013年以负异常(减弱)为主,逐步转变为2014–2018年以正异常(增强)为主。其主要原因在于:2008–2013年中国东部近地面温度总体呈下降趋势,削弱了海陆热力差异,从而抑制东亚夏季风强度;而2014–2018年近地面增温趋势逐渐显著,增强了海陆热力对比,进而强化东亚夏季风环流。

图5 2008-2018年PM₂.₅、O₃和CO₂之间的相互作用对东亚夏季风指数的影响

本研究基于区域气候–化学–生态耦合模式,聚焦 2013年前后PM₂.₅、O₃和CO₂浓度显著变化阶段,系统评估了三者之间的相互作用对东亚夏季风气候的综合影响。结果表明,随着污染物与温室气体浓度的显著变化,其相互作用强度亦发生阶段性变化,进而对东亚夏季风强度产生了相反的影响。因此,在开展区域气候预测与情景预估时,必须充分考虑PM₂.₅、O₃和CO₂之间的相互作用。特别是在大气污染物浓度剧烈波动且人为排放调控显著的区域,考虑后才能更准确刻画其对夏季风系统及区域气候演变的综合影响。

作者介绍

马丹阳,博士,南京师范大学厚生师资博士后、江苏省卓越博士后。主要从事空气污染与气候变化研究。主持国家自然科学基金青年基金1项,参与相关国家自然科学基金研究项目3项,在EST、ACP等高水平国际期刊上以第一/通讯作者发表研究论文近10篇,参与发表SCI论文10余篇。

谢旻,南京师范大学环境学院教授、博士生导师,研究方向为环境大气科学,重点关注双碳政策及气候应对、大气污染成因及防控研究中的热点问题,开展数值模拟和机器学习应用、环境遥感及大数据分析的技术研发。主持国家重点研发计划课题、自然科学基金等10余项,参与国家法规空气质量模型技术体系研究和大气环评导则修订等。发表研究论文160余篇,参与3本教材、6部专著的撰写,授权发明专利3项、软著2项。获教育部自然科学奖2项,中国气象局优秀科技成果、环境保护科学技术奖等行业学会奖8项,以及江苏省优秀博士学位论文导师等教学奖10项。入选江苏省333高层次人才培养工程。

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  1. CONNECT:[ UseTime:0.000557s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000816s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000337s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000549s ]
  6. SELECT * FROM `set` [ RunTime:0.000258s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000588s ]
  8. SELECT * FROM `article` WHERE `id` = 485597 LIMIT 1 [ RunTime:0.000487s ]
  9. UPDATE `article` SET `lasttime` = 1775310676 WHERE `id` = 485597 [ RunTime:0.001657s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000375s ]
  11. SELECT * FROM `article` WHERE `id` < 485597 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000484s ]
  12. SELECT * FROM `article` WHERE `id` > 485597 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003207s ]
  13. SELECT * FROM `article` WHERE `id` < 485597 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003918s ]
  14. SELECT * FROM `article` WHERE `id` < 485597 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001140s ]
  15. SELECT * FROM `article` WHERE `id` < 485597 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000958s ]
0.082092s