Multiple oxygen and sulfur isotopic analyses on water‐soluble sulfate in bulk atmospheric deposition from the southwestern United States

Bao, Huiming

doi:10.1029/2002jd003022

Cited by 51 publications

(40 citation statements)

References 50 publications

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“…␦ 34 S SO4 ranges from Ϫ8.9 to ϩ14.1‰ CDT, which is consistent with a mixture of sulfate derived from pyrite oxidation (Ϫ40 to ϩ10‰ CDT ; Holser and Kaplan, 1966), evaporite dissolution (ϩ8 to ϩ35‰ CDT ; Holser and Kaplan, 1966), and atmospheric deposition: ϩ5‰ CDT in central and southern Ontario (Nriagu and Coker, 1978;Van Stempvoort et al, 1991); ϳϩ4‰ CDT in eastern Canada (Wadleigh et al, 1996); Ϫ1 to ϩ14‰ CDT in northern Japan (Motoyama et al, 2002) and ϩ5.8‰ CDT in California (Bao et al, 2003). The concentrations and ␦ 34 S SO4 measured in the Cordilleran rivers also agree well with values reported for the Fraser river and major tributaries by Cameron et al (1995).…”

Section: Dissolved Sulfate and ␦ 34 S So4mentioning

confidence: 73%

The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera

Spence

Telmer

2005

Geochimica et Cosmochimica Acta

231

154

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Section: Dissolved Sulfate and ␦ 34 S So4mentioning

confidence: 73%

The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera

Spence

Telmer

2005

Geochimica et Cosmochimica Acta

231

154

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“…are readily oxidized to form sulfate by either homogeneous oxidation in gas phase or heterogeneous oxidation in liquid phase [1,2]. Sulfate is one of the main aerosol particles in the atmosphere, a major component of cloud condensation nuclei in the atmosphere, and a major contributor to acid rain [3,4]. Sulfate plays an important role in the chemistry of troposphere and lower stratosphere.…”

mentioning

confidence: 99%

Sulfur isotopic composition and source identification of atmospheric environment in central Zhejiang, China

Zhang

Wang

et al. 2010

Sci. China Earth Sci.

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Sulfur dioxide and sulfate aerosols in the atmosphere are significant factors leading to acidification of the atmospheric environment and worsening the pollution of acid deposition. Because of the "fingerprint" characteristics of the stable sulfur isotopic composition, sulfur isotope has been widely adopted in environmental researches concerning sulfur cycle and source identification. In this study, the atmospheric environment of Jinhua City, central Zhejiang Province, was continuously monitored, and the sulfur isotopic composition of SO 2 and sulfate aerosols in the atmosphere was analyzed. The results indicate that the variation of δ 34 S values for SO 2 ranges from 1.0‰ to 7.5‰, and annual average is 4.7‰±2.3‰, whereas that of sulfate aerosols ranges from 6.4‰ to 9.8‰，and annual average is 8.1‰±1.0‰. The δ 34 S values for SO 2 have significant seasonal variations, which are 7.0‰ in winter and 3.3‰ in summer. These variations cannot be attributed to a single factor, and we suggest a temperature-dependent isotope equilibrium fractionation and elevated biogenic sulfur emissions of isotopically light S in summer may be the main controlling mechanisms. Furthermore, we also discuss the δ 34 S model of atmospheric SO 2 oxidation to form sulfate, and suggest that heterogeneous oxidation dominates in the oxidation reactions of atmospheric SO 2 in the central Zhejiang Province. We further suggest that the relative humidity in the atmosphere plays an important role in the oxidation mechanism of atmospheric SO 2 . sulfur isotope, SO 2, aerosol, homogeneous oxidation, heterogeneous oxidation Citation:Zhang M Y, Wang S J, Ma G Q, et al. Sulfur isotopic composition and source identification of atmospheric environment in central Zhejiang, China.

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“…Watersoluble sulfates in aerosols may originate from both primary (eolian gypsum dust and, as shown here, particulate gypsum from coal combustion) and secondary sulfates. The oxidation of sulfur gases emitted from industrial, agricultural and biological activities are mainly responsible for the creation of secondary sulfates [Bao and Reheis, 2003]. Meteorological factors also have considerable influence over the sulfur isotope composition in aerosols via the effect on sulfate formation processes.…”

mentioning

confidence: 99%

Identification of sources and formation processes of atmospheric sulfate by sulfur isotope and scanning electron microscope measurements

et al. 2010

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[1] Atmospheric sulfate aerosols have a cooling effect on the Earth's surface and can change cloud microphysics and precipitation. China has heavy loading of sulfate, but their sources and formation processes remain uncertain. In this study we characterize possible sources and formation processes of atmospheric sulfate by analyzing sulfur isotope abundances ( 32 S, 33 S, 34 S, and 36 S) and by detailed X-ray diffraction and scanning electron microscope (SEM) imaging of aerosol samples acquired at a rural site in northern China from March to August 2005. The comparison of SEM images from coal fly ash and the atmospheric aerosols suggests that direct emission from coal combustion is a substantial source of primary atmospheric sulfate in the form of CaSO 4 . Airborne gypsum (CaSO 4 ·2H 2 O) is usually attributed to eolian dust or atmospheric reactions with H 2 SO 4 . SEM imaging also reveals mineral particles with soot aggregates adhered to the surface where they could decrease the single scattering albedo of these aerosols. In summer months, heterogeneous oxidation of SO 2 , derived from coal combustion, appears to be the dominant source of atmospheric sulfate. Our analyses of aerosol sulfate show a seasonal variation in D 33 S (D 33 S describes either a 33 S excess or depletion relative to that predicted from consideration of classical mass-dependent isotope effects). Similar sulfur isotope variations have been observed in other atmospheric samples and in (homogenous) gas-phase reactions. On the basis of atmospheric sounding and satellite data as well as a possible relationship between D 33 S and Convective Available Potential Energy (CAPE) during the sampling period, we attribute the sulfur isotope anomalies (D 33 S and D 36 S) in Xianghe aerosol sulfates to another atmospheric source (upper troposphere or lower stratosphere).Citation: Guo, Z., Z. Li, J. Farquhar, A. J. Kaufman, N. Wu, C. Li, R. R. Dickerson, and P. Wang (2010), Identification of sources and formation processes of atmospheric sulfate by sulfur isotope and scanning electron microscope measurements,

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Multiple oxygen and sulfur isotopic analyses on water‐soluble sulfate in bulk atmospheric deposition from the southwestern United States

Cited by 51 publications

References 50 publications

The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera

The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera

Sulfur isotopic composition and source identification of atmospheric environment in central Zhejiang, China

Identification of sources and formation processes of atmospheric sulfate by sulfur isotope and scanning electron microscope measurements

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