GAW Report No. 205 - IGAC Project

CHAPTER 7 – OVERVIEW OF INTERNATIONAL COLLABORATIVE RESEARCH ACTIVITIESThe successful accomplishment of the PRIDE-PRD campaigns deepened theunderstanding of regional air pollution and its environmental effects in the PRD. The results werepublished in a special issue of Atmospheric Environment for PRIDE-PRD2004 and in AtmosphericChemistry and Physics for PRIDE-PRD2006 as well as in other peer reviewed journals, i.e.,Science, JGR, and GRL. The important findings made by PRIDE-PRD are summarized in Table 2.PRIDE-PRD plays a very important role in the decision making process of the PRD localgovernment to implement regional management on basis of multi-pollutants and multi-objectives ofair quality. As one of consequences, Guangdong provincial government recently launched China’sfirst clean air initiative programme in PRD with focus on regional photochemical smog and regionalhaze. Meanwhile, MOST and Guangdong provincial government set up a major project called“Synthesized Prevention Techniques for Air Pollution Complex and Integrated Demonstration inKey City-Cluster Region (3C-STAR)” to help the PRD authority to build up the capacity of regionalair pollution control strategies, regional coordination mechanisms, and related joint actions. A 3-Dregional measurement network and real-time ensemble air quality forecasting system will be in useby the end of 2010, providing the basis for regional air quality management and further fundamentresearch on the complex air pollution in this region.OverviewTable 2 - Summary of findings by PRIDE-PRDTopic Major findings ReferencesInstrumentationBoundarymeteorologyOH/HO2/O3Introduction to PRIDE-PRD and major finding in [Zhang et al., 2008a]PRIDE-PRD2004 campaignAn instrument for measurement of atmospheric peroxy [Li et al., 2009]radical by chemical amplificationThree inversion layers were identified [Fan et al., 2008]HOX measurements and unknown recyclingRegional high O3 mainly comes from chemical production271[Hofzumahaus, et al., 2009; Lou et al.,2010; Lu et al., 2010; Wang et al., 2010;Zhang et al., 2008b]O3 production and its sensitivity to VOCs and NOXVOCs VOC speciation and source apportionment. [Liu Y. et al., 2008; 2008b; 2008c; WangJ.L. et al., 2008]H2O2 and PAN High concentrations were found in secondary pollutants [Hua et al., 2008;Wang et al., 2010]HONOVertical profiles ofair pollutionAerosol chemicaland opticalpropertiesAerosoldistributionECsizeAerosol watersoluble ionsSulfateSOAHigh concentration was found during the daytime andemissions from unknown sources with a photo-enhancedmechanism were estimatedHigh loadings of air pollution were found and theboundary layer height was determined by LIDARSulfate and OC/EC were major components of fineaerosol and major contributors to visibility degradation.Relative humidity dependence of aerosol opticalproperties was identified.New particle formation phenomenon was found andgrowth rate was estimatedHygroscopicity of aerosol was measured and numericallysimulatedEC mixing state was identified by numerical closuremodellingTemporal variation of EC was studiedNitrate-HNO3 partitioning in equilibrium was identified.water-soluble organic carbon aerosols were measuredSulfate production in submicron mode can be explainedby OH and SO2 reactionSOA was estimated by PMF and EC tracermethod[Qin et al., 2009; Su et al., 2008a;2008b][Ansmann et al., 2005; Mueller et al.,2006; Wang W. et al., 2008; Wendischet al., 2008; Sugimoto et al., 2009;Tesche et al., 2008; Tomoaki et al.,2010][Andreae et al., 2008; Cheng, 2008a;2008b; Gnauk et al., 2008; Garland etal., 2008; Jung et al., 2009; Liu S et al.,2008b; Liu X. et al., 2008][Liu S et al., 2008a; Gong et al., 2008;2010; Eichler et al., 2008; Rose et al.,2008][Cheng et al., 2006; Verma et al., 2009][Hu et al., 2008; Miyazaki et al., 2009][Xiao et al., 2009; 2011]