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Featured researches published by Steven Sjostedt.


Environmental Science & Technology | 2017

High Levels of Daytime Molecular Chlorine and Nitryl Chloride at a Rural Site on the North China Plain

Xiaoxi Liu; Hang Qu; L. Gregory Huey; Yuhang Wang; Steven Sjostedt; Limin Zeng; Keding Lu; Yusheng Wu; Min Hu; Min Shao; Tong Zhu; Yuanhang Zhang

Molecular chlorine (Cl2) and nitryl chloride (ClNO2) concentrations were measured using chemical ionization mass spectrometry at a rural site over the North China Plain during June 2014. High levels of daytime Cl2 up to ∼450 pptv were observed. The average diurnal Cl2 mixing ratios showed a maximum around noon at ∼100 pptv. ClNO2 exhibited a strong diurnal variation with early morning maxima reaching ppbv levels and afternoon minima sustained above 60 pptv. A moderate correlation (R2 = 0.31) between Cl2 and sulfur dioxide was observed, perhaps indicating a role for power plant emissions in the generation of the observed chlorine. We also observed a strong correlation (R2 = 0.83) between daytime (10:00-20:00) Cl2 and ClNO2, which implies that both of them were formed from a similar mechanism. In addition, Cl2 production is likely associated with a photochemical mechanism as Cl2 concentrations varied with ozone (O3) levels. The impact of Cl2 and ClNO2 as Cl atom sources is investigated using a photochemical box model. We estimated that the produced Cl atoms oxidized slightly more alkanes than OH radicals and enhanced the daily concentrations of peroxy radicals by 15% and the O3 production rate by 19%.


Atmospheric Environment | 2007

An assessment of the polar HOx photochemical budget based on 2003 Summit Greenland field observations

G. Chen; L. G. Huey; J. H. Crawford; J. R. Olson; Manuel A. Hutterli; Steven Sjostedt; David J. Tanner; Jack E. Dibb; Barry Lefer; Nicola J. Blake; Douglas D. Davis; Andreas Stohl


Archive | 2005

Peroxy and Hydroxyl Radical Measurements During the Spring 2004 Summit Field Campaign

Steven Sjostedt; L. Gregory Huey; David J. Tanner; J. Peischl; Guimin Chen; Jack E. Dibb; Barry Lefer; Manuel A. Hutterli; A. J. Beyersdorf; N. J. Blake; D. R. Blake


Archive | 2004

Measurements of OH and HO2 + RO2 at Summit Greenland

L. Gregory Huey; Steven Sjostedt; David J. Tanner; Jack E. Dibb; Guimin Chen; Barry Lefer; J. Peischl; Manuel A. Hutterli; N. J. Blake; D. R. Blake; A. J. Beyersdorf; T. B. Ryerson


Archive | 2002

Measurement and model results for gas phase OH and H2SO4 during PROPHET 2001.

David J. Tanner; Steven Sjostedt; Greg Huey; D. B. Slusher; Guimin Chen; Barry Lefer; Richard E. Shetter; Mary Anne Carroll; S. Hengel; Edward Charles Fortner; Vicky Young


Archive | 2005

Chemical Ionization Mass Spectrometry Techniques for Measurements of Gas-Phase Ammonia

J. B. Nowak; J. A. Neuman; K. Yoshida; T. B. Ryerson; L. Gregory Huey; David J. Tanner; Steven Sjostedt; G. Hübler; Tara Jean Fortin; D. J. Sueper; F. C. Fehsenfeld


Archive | 2004

In Situ Measurement of OH and (HO2 +RO2) during the 2003 and 2004 Summit, Greenland Campaigns

David J. Tanner; Steven Sjostedt; J. Peischl; L. Gregory Huey


Archive | 2004

An assessment of the HOx budget constrained by Summit 2003 field observations

Guimin Chen; J. H. Crawford; L. Gregory Huey; David J. Tanner; Steven Sjostedt; Jack E. Dibb; Manuel A. Hutterli; Barry Lefer; Richard E. Shetter; N. J. Blake; D. R. Blake; A. J. Beyersdorf; Donna Sueper


Archive | 2004

Measurement of Pernitric Acid, Nitric Acid and Sulfur Dioxide at the South Pole during ANTCI 2003

Steven Sjostedt; David J. Tanner; Jack E. Dibb; M. P. Buhr; Mark J. Warshawsky; Douglas D. Davis; Guimin Chen; R. L. Mauldin; F. L. Eisele; Rieko Arimoto; L. Gregory Huey


Archive | 2004

Modeling and analysis of atmospheric chemistry over the South Pole during ANTCI

J. H. Crawford; Guimin Chen; Douglas D. Davis; M. P. Buhr; F. L. Eisele; R. L. Mauldin; L. Gregory Huey; David J. Tanner; Steven Sjostedt; D. Tan; Jack E. Dibb; Manuel A. Hutterli; D. R. Blake

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David J. Tanner

Georgia Institute of Technology

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L. Gregory Huey

Georgia Institute of Technology

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Jack E. Dibb

University of New Hampshire

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D. R. Blake

University of California

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Douglas D. Davis

Georgia Institute of Technology

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J. Peischl

Cooperative Institute for Research in Environmental Sciences

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