Jennifer Kaiser

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Throughout the year 2001, size-segregated aerosol samples were collected continuously for 10 to 15 days at the French Antarctic Station Dumont d'Urville (DDU) (66 • 40 S, l40 • 01 E, 40 m above mean sea level). The nitrogen and oxygen isotopic ratios of particulate nitrate at DDU exhibit seasonal variations that are among the most 5 extreme observed for(More)
A comprehensive set of stratospheric balloon and aircraft samples was analyzed for the position-dependent isotopic composition of nitrous oxide (N 2 O). Results for a total of 220 samples from between 1987 and 2003 are presented , nearly tripling the number of mass-spectrometric N 2 O isotope measurements in the stratosphere published to date. Cryogenic(More)
We have performed high-precision measurements of the 18 O and position dependent 15 N isotopic composition of N 2 O from Antarctic firn air samples. By comparing these data to simulations carried out with a firn air diffusion model, we have reconstructed the temporal evolution of the N 2 O isotope signatures since pre-industrial times. The heavy isotope(More)
In previous reports on isotopic fractionation in the ultraviolet photolysis of nitrous oxide (N 2 O) only enrichments of heavy isotopes in the remaining N 2 O fraction have been found. However, most direct photolysis experiments have been performed at wavelengths far from the absorption maximum at 182 nm. Here we present high-precision 5 measurements of the(More)
Gaseous nitrous acid (HONO) is an important precursor of tropospheric hydroxyl radicals (OH). OH is responsible for atmospheric self-cleansing and controls the concentrations of greenhouse gases like methane and ozone. Due to lack of measurements, vertical distributions of HONO and its sources in the troposphere remain unclear. Here, we present a set of(More)
This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract The yield of formaldehyde (HCHO) and glyoxal (CHOCHO) from oxidation of volatile organic compounds (VOCs) depends on precursor VOC structure and the concentration of NO x (NO x =(More)