A historical perspective of atmospheric chemicals deposited on a mountain top peat bog in Pennsylvania

Schell, W.R.

doi:10.1016/0166-5162(87)90029-2

Cited by 25 publications

(16 citation statements)

References 22 publications

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“…Schell 1987;Urban et al 1989;Baker et al 1992). Moreover, although S accumulation in peat deposits responds to changes in atmospheric S deposition (both along present-day spatial gradients in deposition and in association with temporal changes in historical deposition), over long-term diagenesis, isotopically light S may be continually released from deep peat.…”

Section: Methodsmentioning

confidence: 99%

“…The magnitude of the error term increases with depth (Schell 1987). In this paper, depths for which the error term exceeded the estimated age (yr) of the section were not included in the construction of core chronologies.…”

Section: Methodsmentioning

confidence: 99%

“…2). conservative interpretation is that each bar in Schell et al (1986) reported apparent S accu- Fig. 2 represents the quantity of S that pres-mulation for 210Pb-dated peat bogs in New ently exists in a 2-cm section of peat; the peat York and Pennsylvania ranging from 2 to 280 pg cm-2 yr-l. A subsurface peak was obtained for the New York peat core, but the pattern for the Pennsylvania core was more similar to that found by Urban et al (1989), with highest values in the surface peat sections.…”

Section: Methodsmentioning

confidence: 99%

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Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

Novák

Wieder

Schell

1994

Limnology & Oceanography

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210Pb chronologies and depth profiles of stable S isotope ratios (834S) and concentrations of organic and inorganic S fractions were determined in peat cores from nine sites in the U.S. and the Czech Republic. Results indicate that depth profiles in S concentrations, S accumulation, and 634S ratios in peat deposits are affected not only by historical patterns in atmospheric S deposition but also by ongoing depthdependent changes in S reduction-oxidation and S immobilization-mineralization processes within a peat deposit. These processes impart a certain degree of mobility to S in peat, bringing into question the validity of reconstructing historical records of S accumulation using dated peat profiles. Over long-term diagenesis, isotopically light S may be continually released from deep peat. This release may result in redistribution of S and S isotopes in peat and suggests that short-term patterns in S accumulation may not persist over much longer time scales.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

Novák

Wieder

Schell

1994

Limnology & Oceanography

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“…Since NH3 acts as the principal neutralizing agent for atmospheric acids and NOx is involved in both the production and destruction of tropospheric ozone (O3), changes in the mixing ratios of these nitrogen gases directly impact the chemistry of the troposphere. The humaninduced enhancement of NOx and NH3 emissions have also accelerated the rate of atmospheric N deposition [Schell, 1987]. Enhanced N deposition may have a fertilizing effect on N-limited ecosystems [Peterson and Melillo, 1985 [Schulze, 1989].…”

mentioning

confidence: 99%

Summertime measurements of aerosol nitrate and ammonium at a northeastern U.S. site

Lefer¹,

Talbot²

2001

J. Geophys. Res.

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Abstract. Summertime measurements of the atmospheric concentrations and aerodynamic size distributions of NH4 + and NO 3-and other major aerosol species were made between 1991 and 1996 at a rural site in central Massachusetts to examine the nature of aerosol chemistry at the Harvard Forest. The bulk aerosol can be described as a mixture of submicron ammonium (bi)sulfate aerosols with smaller amounts of soil-derived particles. Approximately one third of the samples had an anion surplus of greater than 20%, which was assumed to result from unmeasured H + ions. Aerosols in air masses from the southwest were rarely neutralized, especially when SO42-concentrations were greater than • 75 nmol m-3. This result suggests that twice this level (i.e., 150 nmol m-3) may describe an upper limit to the amount of gaseous NH3 encountered enroute to this sampling site during the typical summer transport observed from this region. Aerosol NO 3-was observed at concentrations 4-8 times lower than NH4+, and while occasionally found in the fine mode, the majority of the NO3-was associated with the watersoluble fraction of supermicron soil-derived Ca2+. The similarity of the ammonium and oxalate particle size distributions suggests that (NH4)2(COO)2 aerosols may result from the reaction of gaseous precursors.

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“…210 Pb deposited within young sediment is in excess to the amount of 226 Ra present, and this is referred to as "unsupported 210 Pb"(e.g., Koideetal. 1972;Schell 1987;Appleby et al 1990;Cundy & Croudace 1995). It should therefore be possible to measure SARs based upon the profile of excess 2l0 Pb with depth (e.g., Koide et al 1972;Appleby & Oldfield 1978, 1992Helz et al 1985).…”

Section: Corementioning

confidence: 99%

²¹⁰Pb chronology from Wellington Harbour, New Zealand

Goff

Whitehead

Ditchburn

1998

New Zealand Journal of Marine and Freshwater Research

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A historical perspective of atmospheric chemicals deposited on a mountain top peat bog in Pennsylvania

Cited by 25 publications

References 22 publications

Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

Summertime measurements of aerosol nitrate and ammonium at a northeastern U.S. site

²¹⁰Pb chronology from Wellington Harbour, New Zealand

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A historical perspective of atmospheric chemicals deposited on a mountain top peat bog in Pennsylvania

Cited by 25 publications

References 22 publications

Sulfur during early diagenesis in Sphagnum peat: Insights from δ34S ratio profiles in 21Pb‐dated peat cores

Sulfur during early diagenesis in Sphagnum peat: Insights from δ34S ratio profiles in 21Pb‐dated peat cores

Summertime measurements of aerosol nitrate and ammonium at a northeastern U.S. site

210Pb chronology from Wellington Harbour, New Zealand

Contact Info

Product

Resources

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Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

Sulfur during early diagenesis in Sphagnum peat: Insights from δ₃₄S ratio profiles in ₂₁Pb‐dated peat cores

²¹⁰Pb chronology from Wellington Harbour, New Zealand