Journal ArticleDOI
Weather conditions conducive to Beijing severe haze more frequent under climate change
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In this paper, the authors looked at how atmospheric conditions contribute and projected climate change will increase conditions favorable to severe haze events in Beijing. But they did not consider the effect of global greenhouse gas emissions.Abstract:
Severe winter air pollution events, attributed to emissions from development, have increased in Beijing in recent decades. This study looks at how atmospheric conditions contribute and projects climate change will increase conditions favourable to such events. The frequency of Beijing winter severe haze episodes has increased substantially over the past decades1,2,3,4, and is commonly attributed to increased pollutant emissions from China’s rapid economic development5,6. During such episodes, levels of fine particulate matter are harmful to human health and the environment, and cause massive disruption to economic activities3,4,7,8,9,10,11,12,13,14,15,16, as occurred in January 201317,18,19,20,21. Conducive weather conditions are an important ingredient of severe haze episodes3,21, and include reduced surface winter northerlies3,21, weakened northwesterlies in the midtroposphere, and enhanced thermal stability of the lower atmosphere1,3,16,21. How such weather conditions may respond to climate change is not clear. Here we project a 50% increase in the frequency and an 80% increase in the persistence of conducive weather conditions similar to those in January 2013, in response to climate change. The frequency and persistence between the historical (1950–1999) and future (2050–2099) climate were compared in 15 models under Representative Concentration Pathway 8.5 (RCP8.5)22. The increased frequency is consistent with large-scale circulation changes, including an Arctic Oscillation upward trend23,24, weakening East Asian winter monsoon25,26, and faster warming in the lower troposphere27,28. Thus, circulation changes induced by global greenhouse gas emissions can contribute to the increased Beijing severe haze frequency.read more
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Size-resolved carbonaceous aerosols at near surface level and the hilltop in a typical valley city, China
TL;DR: Based on the synchronous measurements of size-resolved carbonaceous aerosols and meteorological data at near surface level and hilltop (about 620m above the valley) in Lanzhou of northwest China, the authors compared organic and elemental carbon (OC, EC) size distributions at the two altitudes and revealed the key influencing factors in a typical urban valley, China.
Journal ArticleDOI
Validation of MODIS-Aqua Aerosol Products C051 and C006 over the Beijing-Tianjin-Hebei Region
TL;DR: In this article, the authors evaluated the performance of the MODIS-Aqua Collection 51 (C051) and C006 AOD retrievals over the Beijing-Tianjin-Hebei region in China from 2006 to 2015 using ground-based Sun photometers.
Journal ArticleDOI
Distinction of two kinds of haze
Ke Wei,Xiaoyan Tang,Guiqian Tang,Junxia Wang,Luyang Xu,Jing Li,Chunhuan Ni,Yanjun Zhou,Yeyi Ding,Wenjun Liu +9 more
TL;DR: In this paper, a distinction between meteorological haze days and environmental haze days was made in the study of PM pollution variation and cause in China, which will have important applications in addressing air pollution, formulating environmental policy, and dealing with the health effect of haze in China.
Journal ArticleDOI
Pollution patterns and their meteorological analysis all over China
TL;DR: In this article, the distribution of wintertime PM2.5 and summertime O3 pollution in China from 2015 to 2019 were classified with empirical orthogonal function (EOF) method, and the types of weather characteristics were analyzed, respectively.
References
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The NCEP/NCAR 40-Year Reanalysis Project
Eugenia Kalnay,Masao Kanamitsu,Robert Kistler,William D. Collins,D.G. Deaven,L. S. Gandin,M. Iredell,Suranjana Saha,Glenn H. White,John S. Woollen,Yuejian Zhu,Muthuvel Chelliah,Wesley Ebisuzaki,Wayne Higgins,John E. Janowiak,Kingtse C. Mo,Chester F. Ropelewski,Julian X. L. Wang,Ants Leetmaa,Richard W. Reynolds,Roy L. Jenne,Dennis Joseph +21 more
TL;DR: The NCEP/NCAR 40-yr reanalysis uses a frozen state-of-the-art global data assimilation system and a database as complete as possible, except that the horizontal resolution is T62 (about 210 km) as discussed by the authors.
Journal ArticleDOI
An Overview of CMIP5 and the Experiment Design
TL;DR: The fifth phase of the Coupled Model Intercomparison Project (CMIP5) will produce a state-of-the- art multimodel dataset designed to advance the authors' knowledge of climate variability and climate change.
Journal ArticleDOI
Health effects of fine particulate air pollution: lines that connect
C. Arden Pope,Douglas W. Dockery +1 more
TL;DR: A comprehensive evaluation of the research findings provides persuasive evidence that exposure to fine particulate air pollution has adverse effects on cardiopulmonary health.
Journal ArticleDOI
High secondary aerosol contribution to particulate pollution during haze events in China
Ru-Jin Huang,Yan-Lin Zhang,Carlo Bozzetti,Kin Fai Ho,Junji Cao,Yongming Han,Kaspar R. Daellenbach,Jay G. Slowik,Stephen Matthew Platt,Francesco Canonaco,Peter Zotter,Robert Wolf,Simone M. Pieber,Emily A. Bruns,Monica Crippa,Giancarlo Ciarelli,Andrea Piazzalunga,Margit Schwikowski,Gülcin Abbaszade,Jürgen Schnelle-Kreis,Ralf Zimmermann,Zhisheng An,Sönke Szidat,Urs Baltensperger,Imad El Haddad,André S. H. Prévôt +25 more
TL;DR: The results suggest that, in addition to mitigating primary particulate emissions, reducing the emissions of secondary aerosol precursors from fossil fuel combustion and biomass burning is likely to be important for controlling China’s PM2.5 levels and for reducing the environmental, economic and health impacts resulting from particulate pollution.
Health effects of fine particulate air pollution: line that connect
TL;DR: The 2006 A&WMA Critical Review on Health Effects of Fine Particulate Air Pollution: Lines that Connect documents substantial progress since the 1997 Critical Review in the areas of short-term exposure and mortality and time scales of exposure.
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