DOI: 10.1016/j.atmosenv.2017.07.047
Scopus记录号: 2-s2.0-85026783796
论文题名: Influence of Northeast Monsoon cold surges on air quality in Southeast Asia
作者: Ashfold M ; J ; , Latif M ; T ; , Samah A ; A ; , Mead M ; I ; , Harris N ; R ; P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 166 起始页码: 498
结束页码: 509
语种: 英语
英文关键词: Air quality
; Northeast Monsoon
; Ozone
; Pollution
; Southeast Asia
Scopus关键词: Air quality
; Atmospheric chemistry
; Atmospheric composition
; Atmospheric pressure
; Atmospheric thermodynamics
; Carbon
; Carbon monoxide
; Climatology
; Ozone
; Pollution
; Chemical modelling
; El Nino southern oscillation
; Northeast monsoon
; Quality guidelines
; Southeast Asia
; Trajectory calculations
; Transport pathways
; World Health Organization
; Air pollution
; nitrogen oxide
; ozone
; air quality
; atmospheric modeling
; atmospheric pollution
; carbon monoxide
; emission
; monsoon
; ozone
; air pollution
; air quality
; Article
; atmosphere
; climate
; cold climate
; El Nino
; latitude
; precursor
; priority journal
; quality control procedures
; seasonal variation
; Southeast Asia
; surface property
; wind
; winter
; Malaysia
; North America
; Pacific Ocean
; West Malaysia
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Ozone (O3) is an important ground-level pollutant. O3 levels and emissions of O3 precursors have increased significantly over recent decades in East Asia and export of this O3 eastward across the Pacific Ocean is well documented. Here we show that East Asian O3 is also transported southward to tropical Southeast (SE) Asia during the Northeast Monsoon (NEM) season (defined as November to February), and that this transport pathway is especially strong during ‘cold surges’. Our analysis employs reanalysis data and measurements from surface sites in Peninsular Malaysia, both covering 2003–2012, along with trajectory calculations. Using a cold surge index (northerly winds at 925 hPa averaged over 105–110°E, 5°N) to define sub-seasonal strengthening of the NEM winds, we find the largest changes in a region covering much of the Indochinese Peninsula and surrounding seas. Here, the levels of O3 and another key pollutant, carbon monoxide, calculated by the Monitoring Atmospheric Composition and Climate (MACC) Reanalysis are on average elevated by, respectively, >40% (∼15 ppb) and >60% (∼80 ppb) during cold surges. Further, in the broader region of SE Asia local afternoon exceedances of the World Health Organization's air quality guideline for O3 (100 μg m−3, or ∼50 ppb, averaged over 8 h) largely occur during these cold surges. Day-to-day variations in available O3 observations at surface sites on the east coast of Peninsular Malaysia and in corresponding parts of the MACC Reanalysis are similar, and are clearly linked to cold surges. However, observed O3 levels are typically ∼10–20 ppb lower than the MACC Reanalysis. We show that these observations are also subject to influence from local urban pollution. In agreement with past work, we find year-to-year variations in cold surge activity related to the El Nino-Southern Oscillation (ENSO), but this does not appear to be the dominant influence of ENSO on atmospheric composition in this region. Overall, our study indicates that the influence of East Asian pollution on air quality in SE Asia during the NEM could be at least as large as the corresponding, well-studied spring-time influence on North America. Both an enhanced regional observational capability and chemical modelling studies will be required to fully untangle the importance of this long-range influence relative to local processes. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82593
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental and Geographical Sciences, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia; School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia; Institute for Environment and Development (Lestari), Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia; Institute of Ocean and Earth Sciences, University of Malaya, Kuala Lumpur, Malaysia; Centre for Atmospheric Informatics and Emissions Technology, Cranfield University, Cranfield, United Kingdom
Recommended Citation:
Ashfold M,J,, Latif M,et al. Influence of Northeast Monsoon cold surges on air quality in Southeast Asia[J]. Atmospheric Environment,2017-01-01,166