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Long-term (2001-2012) observation of the modeled hygroscopic growth factor of remote marine TSP aerosols over the western North Pacific : impact of long-range transport of pollutants and their mixing states

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Title: Long-term (2001-2012) observation of the modeled hygroscopic growth factor of remote marine TSP aerosols over the western North Pacific : impact of long-range transport of pollutants and their mixing states
Authors: Boreddy, S. K. R. Browse this author
Kawamura, Kimitaka Browse this author
Haque, Md. Mozammel Browse this author
Issue Date: 11-Oct-2016
Publisher: Royal Society of Chemistry
Journal Title: Physical chemistry chemical physics
Volume: 17
Issue: 43
Start Page: 29344
End Page: 29353
Publisher DOI: 10.1039/c5cp05315c
PMID: 26473178
Abstract: In order to assess the seasonal and annual variability of long-range transported anthropogenic pollutants from East Asia and their effect on the hygroscopicity and precipitation process over the western North Pacific, we conducted long-term calculations of bulk hygroscopicity, g(90%)(ZSR), based on the ZSR model using chemical composition data from 2001-2012 at Chichijima Island. We found that sea-salts (Na+ and Cl-) are the major mass fraction (65%) of the total water-soluble matter followed by SO42- (20%) and WSOM (6%). The seasonal variation of g(90%)(ZSR) was high in summer to autumn and low in winter to spring months, probably due to the influence of the long-range transport of anthropogenic SO42-, dust, and organics from East Asia and their interaction with sea-salts through heterogeneous reactions. On the other hand, annual variations of g(90%)(ZSR) showed a decrease from 2001 to 2006 and then an increase from 2007 to 2012. Interestingly, the annual variations in SO42- mass fractions showed an increase from 2001 to 2006 and then a decrease from 2007 to 2012, demonstrating that SO42- seriously suppresses the hygroscopic growth of sea-salt particles over the western North Pacific. This is further supported by the strong negative correlation between SO42- and g(90%)(ZSR). Based on the MODIS satellite data, the present study demonstrates that long-range transported anthropogenic pollutants from East Asia to the North Pacific can act as efficient cloud condensation nuclei but significantly suppress the precipitation by reducing the size of cloud droplets over the western North Pacific.
Type: article (author version)
URI: http://hdl.handle.net/2115/62997
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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