Polluted dust promotes new particle formation and growth

Nie, Wei; Ding, Aijun; Wang, Tao; Kerminen, V.-M.; George, Christian; Xue, Likun; Wang, Wenxing; Zhang, Qingzhu; Petäj̈ä, Tuukka; Qi, Ximeng; Gao, Xiang; Wang, Xinfeng; Yang, Xiu‐Qun; Fu, Congbin; Kulmala, Markku

doi:10.1038/srep06634

Cited by 152 publications

(133 citation statements)

References 56 publications

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“…The YRD has been reported as a major source region of both black carbon and sulfate Andersson et al, 2015). In addition, other aerosol sources such as dust emissions render the interactions between aerosols and clouds complicated (Nie et al, 2014). The continental area of interest is characterized by a high level of anthropogenic emissions and is well suited for research related to the indirect effects of aerosols on cloud micro-and macro-physical properties.…”

Section: Description Of the Study Regionmentioning

confidence: 99%

Analysis of aerosol effects on warm clouds over the Yangtze River Delta from multi-sensor satellite observations

et al. 2017

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Abstract. Aerosol effects on low warm clouds over the Yangtze River Delta (YRD, eastern China) are examined using co-located MODIS, CALIOP and CloudSat observations. By taking the vertical locations of aerosol and cloud layers into account, we use simultaneously observed aerosol and cloud data to investigate relationships between cloud properties and the amount of aerosol particles (using aerosol optical depth, AOD, as a proxy). Also, we investigate the impact of aerosol types on the variation of cloud properties with AOD. Finally, we explore how meteorological conditions affect these relationships using ERA-Interim reanalysis data. This study shows that the relation between cloud properties and AOD depends on the aerosol abundance, with a different behaviour for low and high AOD (i.e. AOD < 0.35 and AOD > 0.35). This applies to cloud droplet effective radius (CDR) and cloud fraction (CF), but not to cloud optical thickness (COT) and cloud top pressure (CTP). COT is found to decrease when AOD increases, which may be due to radiative effects and retrieval artefacts caused by absorbing aerosol. Conversely, CTP tends to increase with elevated AOD, indicating that the aerosol is not always prone to expand the vertical extension. It also shows that the COT-CDR and CWP (cloud liquid water path)-CDR relationships are not unique, but affected by atmospheric aerosol loading. Furthermore, separation of cases with either polluted dust or smoke aerosol shows that aerosol-cloud interaction (ACI) is stronger for clouds mixed with smoke aerosol than for clouds mixed with dust, which is ascribed to the higher absorption efficiency of smoke than dust. The variation of cloud properties with AOD is analysed for various relative humidity and boundary layer thermodynamic and dynamic conditions, showing that high relative humidity favours larger cloud droplet particles and increases cloud formation, irrespective of vertical or horizontal level. Stable atmospheric conditions enhance cloud cover horizontally. However, unstable atmospheric conditions favour thicker and higher clouds. Dynamically, upward motion of air parcels can also facilitate the formation of thicker and higher clouds. Overall, the present study provides an understanding of the impact of aerosols on cloud properties over the YRD. In addition to the amount of aerosol particles (or AOD), evidence is provided that aerosol types and ambient environmental conditions need to be considered to understand the observed relationships between cloud properties and AOD.

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Section: Description Of the Study Regionmentioning

confidence: 99%

Analysis of aerosol effects on warm clouds over the Yangtze River Delta from multi-sensor satellite observations

et al. 2017

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“…For example, intensive forest burning activities often take place in south Asia during spring and in Siberia during summer, whereas intensive anthropogenic burning of agricultural straw takes place in the north and east China plains. Dust storms frequently occur in the Taklimakan and Gobi deserts in north-west China, and this dust is often transported over eastern China, southern China, the Pacific Ocean and even the entire globe (Nie et al, 2014). After mixing with other anthropogenic pollutants, biomass burning and mineral dust aerosols have been found to cause complex interactions in the climate system (Ding et al, 2013a;Nie et al, 2014).…”

Section: Large-scale Pollutant Transport and Sourcesmentioning

confidence: 99%

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

et al. 2016

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Abstract. The northern Eurasian regions and Arctic Ocean will very likely undergo substantial changes during the next decades. The Arctic-boreal natural environments play a crucial role in the global climate via albedo change, carbon sources and sinks as well as atmospheric aerosol production from biogenic volatile organic compounds. Furthermore, it is expected that global trade activities, demographic movement, and use of natural resources will be increasing in the Arctic regions. There is a need for a novel research approach, which not only identifies and tackles the relevant multi-disciplinary research questions, but also is able to make a holistic system analysis of the expected feedbacks. In this paper, we introduce the research agenda of the Pan-Eurasian Experiment (PEEX), a multi-scale, multi-disciplinary and international program started in 2012 (https://www.atm.helsinki.fi/peex/). PEEX sets a research approach by which large-scale research topics are investigated from a system perspective and which aims to fill the key gaps in our understanding of the feedbacks and interactions between the land-atmosphereaquatic-society continuum in the northern Eurasian region. We introduce here the state of the art for the key topics in the PEEX research agenda and present the future prospects of the research, which we see relevant in this context.

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“…higher OC/EC ratios) during dust periods and suggested that the scavenging of semi-volatile organic gases by dust particles were the reason of OC enhancement. Also, recent evidence suggests that mineral dust has the potential to participate in the atmospheric heterogeneous photochemical processes (Nie et al, 2014) and therefore can promote secondary aerosol formation of OC. In our study, the relatively high OC/EC ratios in winter reflected the potential contributions of coal burning, which was reported to have elevated OC/EC ratios (12.0) (Cao et al, 2005).…”

Section: Temporal Variations Of Wsoc and Wsoc/oc Ratiomentioning

confidence: 99%

Water-soluble organic carbon (WSOC) and its temperature-resolved carbon fractions in atmospheric aerosols in Beijing

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et al. 2016

Atmospheric Research

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Polluted dust promotes new particle formation and growth

Cited by 152 publications

References 56 publications

Analysis of aerosol effects on warm clouds over the Yangtze River Delta from multi-sensor satellite observations

Analysis of aerosol effects on warm clouds over the Yangtze River Delta from multi-sensor satellite observations

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

Water-soluble organic carbon (WSOC) and its temperature-resolved carbon fractions in atmospheric aerosols in Beijing

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