Formaldehyde and peroxide concentrations in Law Dome (Antarctica) firn and ice cores
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
Publication date: January 1, 2000
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