Iodine speciation in marine aerosols along a 15 000-km round-trip cruise path from Shanghai, China, to the Arctic Ocean
Siqi Xu A , Zhouqing Xie A D , Bing Li B , Wei Liu B , Liguang Sun A , Hui Kang A , Hongxia Yang B and Pengfei Zhang CA Institute of Polar Environment, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
B National Research Center for Geoanalysis, Beijing, 100037, P. R. China.
C Department of Earth and Atmospheric Sciences, City College of New York,New York, NY 10031, USA.
D Corresponding author. Email: zqxie@ustc.edu.cn
Environmental Chemistry 7(5) 406-412 https://doi.org/10.1071/EN10048
Submitted: 6 May 2010 Accepted: 4 August 2010 Published: 13 October 2010
Environmental context. Iodine in the atmosphere plays an important role in troposphere ozone destruction and climate change. However, cycling of atmospheric iodine is still poorly understood because of uncertainties in iodine speciation in aerosols. Here we report iodine levels and speciation in marine aerosols collected along a cruise path from Shanghai to the Arctic Ocean.
Abstract. Total iodine (TI) and water-soluble iodine species in the total suspended particle samples collected onboard a round-trip cruise from Shanghai, China to the Arctic Ocean were measured using inductively coupled plasma mass spectrometry and ion chromatography–inductively coupled plasma mass spectrometry respectively. TI and total soluble iodine (TSI) levels varied considerably both spatially and temporally over the length of the voyage. The maximum iodine levels occurred in the Arctic Ocean in September, whereas the minimum levels occurred in the Western and Northern Pacific Ocean in July. Iodate (IO3 –) was found to be the dominant species in most samples, accounting for 57.8% of TSI on average, whereas iodide and soluble organic iodine only accounted for 16.8% of TSI on average. There was also a significant fraction of insoluble iodine. This finding confirms model predictions of atmospheric iodine speciation, i.e. the predominant iodine species is iodate rather than iodide.
Additional keywords: iodate, iodide, sea ice.
Acknowledgements
This study was supported by the China National Natural Science Foundation (Grant No. 40776001 and No. 40773048), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (Grant 200354), the Ministry of Education of China and the Chinese Academy of Sciences (Grant KZCX2-YW-QN506) and Basic Scientific Research (No. 2008CSJ01). Fieldwork was supported by the Chinese Arctic and Antarctic Administration and the third China Arctic Research Expedition. The authors thank Jingjing Yu for sample analysis. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model or READY website (www.ready.arl.noaa.gov) used in this publication.
[1]
C. D. O’Dowd ,
J. L. Jimenez ,
R. Bahreini ,
R. C. Flagan ,
J. H. Seinfeld ,
K. Hameri ,
L. Pirjola ,
M. Kulmala ,
et al. Marine aerosol formation from biogenic iodine emissions.
Nature 2002
, 417, 632.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
[Verified 7 September 2010].
[17]
[18]
H. Chen ,
R. Brandt ,
R. Bandur ,
T. Hoffmann ,
Characterization of iodine species in the marine aerosol: to understand their roles in particle formation processes.
Front. Chem. China. 2006
, 1, 119.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
[19]
D. Shindell ,
G. Faluvegi ,
Climate response to regional radiative forcing during the twentieth century.
Nat. Geosci. 2009
, 2, 294.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
[20]
R. A. Duce ,
A. H. Woodcock ,
Difference in chemical composition of atmospheric sea salt particles produced in the surf zone and on the open sea in Hawaii.
Tellus 1971
, 23, 427.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
[21]
C. D. O’Dowd ,
T. Hoffmann ,
Coastal new particle formation: a review of the current state-of-the-art.
Environ. Chem. 2006
, 3, 245.
[22]
K. R. Redeker ,
N. Y. Wang ,
J. C. Low ,
A. McMillan ,
S. C. Tyler ,
R. J. Cicerone ,
Emissions of methyl halides and methane from rice paddies.
Science 2000
, 290, 966.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
[23]
B. C. Sive ,
R. K. Varner ,
H. Mao ,
D. R. Blake ,
O. W. Wingenter ,
R. Talbot ,
A large terrestrial source of methyl iodide.
Geophys. Res. Lett. 2007
, 34, L17808.
| Crossref | GoogleScholarGoogle Scholar |
[24]
K. R. Arrigo ,
G. L. van Dijken ,
Annual changes in sea-ice, chlorophyll a, and primary production in the Ross Sea, Antarctica.
Deep-Sea Res. 2004
, 51, 117.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
[25]
S. Pechtl ,
G. Schmitz ,
R. Von Glasow ,
Modelling iodide–iodate speciation in atmospheric aerosol: contributions of inorganic and organic iodine chemistry.
Atmos. Chem. Phys. 2007
, 7, 1381.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
