Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/acp-15-6943-2015 |
On the competition among aerosol number, size and composition in predicting CCN variability: a multi-annual field study in an urbanized desert | |
Crosbie, E.1; Youn, J-S2; Balch, B.3; Wonaschuetz, A.4; Shingler, T.3; Wang, Z.3; Conant, W. C.1; Betterton, E. A.1; Sorooshian, A.1,2,3 | |
通讯作者 | Sorooshian, A. |
来源期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2015 |
卷号 | 15期号:12页码:6943-6958 |
英文摘要 | A 2-year data set of measured CCN (cloud condensation nuclei) concentrations at 0.2 % supersaturation is combined with aerosol size distribution and aerosol composition data to probe the effects of aerosol number concentrations, size distribution and composition on CCN patterns. Data were collected over a period of 2 years (2012-2014) in central Tucson, Arizona: a significant urban area surrounded by a sparsely populated desert. Average CCN concentrations are typically lowest in spring (233 cm(-3)), highest in winter (430 cm(-3)) and have a secondary peak during the North American monsoon season (July to September; 372 cm(-3)). There is significant variability outside of seasonal patterns, with extreme concentrations (1 and 99 % levels) ranging from 56 to 1945 cm(-3) as measured during the winter, the season with highest variability. Modeled CCN concentrations based on fixed chemical composition achieve better closure in winter, with size and number alone able to predict 82 % of the variance in CCN concentration. Changes in aerosol chemical composition are typically aligned with changes in size and aerosol number, such that hygroscopicity can be parameterized even though it is still variable. In summer, models based on fixed chemical composition explain at best only 41 % (pre-monsoon) and 36 % (monsoon) of the variance. This is attributed to the effects of secondary organic aerosol (SOA) production, the competition between new particle formation and condensational growth, the complex interaction of meteorology, regional and local emissions and multi-phase chemistry during the North American monsoon. Chemical composition is found to be an important factor for improving predictability in spring and on longer timescales in winter. Parameterized models typically exhibit improved predictive skill when there are strong relationships between CCN concentrations and the prevailing meteorology and dominant aerosol physicochemical processes, suggesting that similar findings could be possible in other locations with comparable climates and geography. |
类型 | Article |
语种 | 英语 |
国家 | USA ; Austria |
收录类别 | SCI-E |
WOS记录号 | WOS:000357117500026 |
WOS关键词 | CLOUD CONDENSATION NUCLEI ; SINGLE-PARAMETER REPRESENTATION ; SECONDARY ORGANIC AEROSOL ; MARINE BOUNDARY-LAYER ; HYGROSCOPIC GROWTH ; MIXING STATE ; CHEMICAL-COMPOSITION ; DROPLET GROWTH ; WARM CUMULUS ; ACTIVATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/186050 |
作者单位 | 1.Univ Arizona, Dept Atmospher Sci, Tucson, AZ USA; 2.Univ Arizona, Mel & Enid Zuckerman Coll Publ Hlth, Tucson, AZ USA; 3.Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ 85721 USA; 4.Univ Vienna, Fac Phys, Vienna, Austria |
推荐引用方式 GB/T 7714 | Crosbie, E.,Youn, J-S,Balch, B.,et al. On the competition among aerosol number, size and composition in predicting CCN variability: a multi-annual field study in an urbanized desert[J]. University of Arizona,2015,15(12):6943-6958. |
APA | Crosbie, E..,Youn, J-S.,Balch, B..,Wonaschuetz, A..,Shingler, T..,...&Sorooshian, A..(2015).On the competition among aerosol number, size and composition in predicting CCN variability: a multi-annual field study in an urbanized desert.ATMOSPHERIC CHEMISTRY AND PHYSICS,15(12),6943-6958. |
MLA | Crosbie, E.,et al."On the competition among aerosol number, size and composition in predicting CCN variability: a multi-annual field study in an urbanized desert".ATMOSPHERIC CHEMISTRY AND PHYSICS 15.12(2015):6943-6958. |
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