A study of the spatial and temporal distribution of methane sulphonic acid (MSA) and nssSO42- concentrations in snow-pit samples was performed to determine the main and secondary sources, transport effects and seasonal pattern of biogenic sulphur compounds. Four snowpits, about 3 m deep, excavated at the same time at different altitudes (870-2960 m a.s.l.) in Northern Victoria Land, Antarctica, gave coherent information about the effect of altitude and seasonality on the snow chemical composition. A progressive, well-defined decreasing concentration trend is shown as altitude increases, with the biggest effect in the first 1000 m a.s.l. At higher altitudes, biogenic sources make the most important contribution to the total sulphate balance with respect to sea-spray input- Particular attention was paid to the relationship between MSA and nssSO42- by using MSA as a univocal biogenic marker. The nssSO42-/MSA ratio was evaluated with respect to altitude and seasonality to determine the effect of transport mechanisms (such as long-range transport and fractionation) or non-dimethyl sulphide sources on nssSO42- snow content

Spatial distribution and seasonal pattern of biogenic sulphur compounds in snow from Northern Victoria Land (Antarctica) / R. UDISTI; R. TRAVERSI; S. BECAGLI; G. PICCARDI. - In: ANNALS OF GLACIOLOGY. - ISSN 0260-3055. - STAMPA. - 27:(1998), pp. 535-542.

Spatial distribution and seasonal pattern of biogenic sulphur compounds in snow from Northern Victoria Land (Antarctica).

UDISTI, ROBERTO;TRAVERSI, RITA;BECAGLI, SILVIA;PICCARDI, GIOVANNI
1998

Abstract

A study of the spatial and temporal distribution of methane sulphonic acid (MSA) and nssSO42- concentrations in snow-pit samples was performed to determine the main and secondary sources, transport effects and seasonal pattern of biogenic sulphur compounds. Four snowpits, about 3 m deep, excavated at the same time at different altitudes (870-2960 m a.s.l.) in Northern Victoria Land, Antarctica, gave coherent information about the effect of altitude and seasonality on the snow chemical composition. A progressive, well-defined decreasing concentration trend is shown as altitude increases, with the biggest effect in the first 1000 m a.s.l. At higher altitudes, biogenic sources make the most important contribution to the total sulphate balance with respect to sea-spray input- Particular attention was paid to the relationship between MSA and nssSO42- by using MSA as a univocal biogenic marker. The nssSO42-/MSA ratio was evaluated with respect to altitude and seasonality to determine the effect of transport mechanisms (such as long-range transport and fractionation) or non-dimethyl sulphide sources on nssSO42- snow content
1998
27
535
542
R. UDISTI; R. TRAVERSI; S. BECAGLI; G. PICCARDI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/208219
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