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Formaldehyde and peroxide concentrations in Law Dome (Antarctica) firn and ice cores

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Abstract:

Peroxide speciation and formaldehyde measurements have been made on ice cores retrieved from Law Dome, Antarctica. Measurements were made for ice deposited during four different periods: modern, pre-industrial Holocene, early Holocene and Last Glacial Maximum (LGM). The data show modern peroxide levels > 50% above pre-industrial levels (at ~ 1.6 mol L-1) and an absence of methyl hydroperoxide (down to a detection threshold of 0.003 mol L-1). Formaldehyde levels show a 40% in- crease from pre-industrial to modern times (rising from ~ 0.07 mol L-1 to ~ 0.10 mol L-1),with a further increase and possible seasonality near the surface which we associate with post-depositional processes. Peroxide levels in LGM ice are low, but formaldehyde concentrations are high (at ~ 0.13 mol L-1) relative to modern levels. Similar high levels of formaldehyde are seen in early Holocene ice (~ 6900 years BP).

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756500781833502

Publication date: January 1, 2000

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  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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