Daniela Pittauerova
University of Bremen
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Featured researches published by Daniela Pittauerova.
Nature | 2010
Stefan Mulitza; David Heslop; Daniela Pittauerova; Helmut W Fischer; Inka Meyer; Jan-Berend W Stuut; Matthias Zabel; Gesine Mollenhauer; James A Collins; Henning Kuhnert; Michael Schulz
The Sahara Desert is the largest source of mineral dust in the world. Emissions of African dust increased sharply in the early 1970s (ref. 2), a change that has been attributed mainly to drought in the Sahara/Sahel region caused by changes in the global distribution of sea surface temperature. The human contribution to land degradation and dust mobilization in this region remains poorly understood, owing to the paucity of data that would allow the identification of long-term trends in desertification. Direct measurements of airborne African dust concentrations only became available in the mid-1960s from a station on Barbados and subsequently from satellite imagery since the late 1970s: they do not cover the onset of commercial agriculture in the Sahel region ∼170 years ago. Here we construct a 3,200-year record of dust deposition off northwest Africa by investigating the chemistry and grain-size distribution of terrigenous sediments deposited at a marine site located directly under the West African dust plume. With the help of our dust record and a proxy record for West African precipitation we find that, on the century scale, dust deposition is related to precipitation in tropical West Africa until the seventeenth century. At the beginning of the nineteenth century, a sharp increase in dust deposition parallels the advent of commercial agriculture in the Sahel region. Our findings suggest that human-induced dust emissions from the Sahel region have contributed to the atmospheric dust load for about 200 years.
Marine Pollution Bulletin | 2012
Karin A F Zonneveld; Liang Chen; Rehab Elshanawany; Helmut W Fischer; Mirja Hoins; Mohammed I Ibrahim; Daniela Pittauerova; Gerard J M Versteegh
To obtain insight into the natural and/or human-induced changes in the trophic state of the distal portion of the Po River discharge plume over the last two centuries, high temporal resolution dinoflagellate cyst records were established at three sites. Cyst production rates appear to reflect the natural variability in the rivers discharge, whereas cyst associations reflect the trophic state of the upper waters, which in turn can be related to agricultural development. The increased abundances of Lingulodinium machaerophorum and Stelladinium stellatum found as early as 1890 and 1920 correspond to the beginning of the industrial revolution in Italy and the first chemical production and dispersion of ammonia throughout Europe. After 1955, the increased abundances of these species and of Polykrikos schwartzii, Brigantedinium spp. and Pentapharsodinium dalei correspond to agriculturally induced alterations of the hypertrophic conditions. A slight improvement in water quality can be observed from 1987 onward.
Journal of Environmental Radioactivity | 2009
Helmut W Fischer; Susanne Ulbrich; Daniela Pittauerova; Bernd Hettwig
Motivated by the detection of (131)I in river sediment in routine long-term surveillance samples, a systematic short-term study of the wastewater treatment chain was planned and conducted. Inflow, effluent and primary sludge were collected on a daily basis during two weeks at a regional wastewater treatment plant. Samples were investigated by gamma spectroscopy. Four medically used isotopes could be identified ((131)I and (99m)Tc regularly, (153)Sm and (123)I sporadically). The concentration levels coincide well with literature data for (131)I, and with our own long-term data for (131)I and (99m)Tc for the same plant. Cosmogenic (7)Be activity in primary sludge correlated well with rainfall intensity. Surface sediment was sampled at low tide at both shores of the river, up- and downstream of the plant. (131)I was identified in all samples, with a sharp maximum (about 100 Bq kg(-1)d.m.) at the discharge point of the plant and lower levels elsewhere, decreasing monotonically in downstream direction. (7)Be and (137)Cs showed the same behaviour, but no peak at the discharge point. Predictions from simple equilibrium models for the transport and sedimentation of (131)I show good agreement with the experimental data and suggest that the wastewater treatment plant is the main source for this isotope.
Journal of Environmental Radioactivity | 2011
Daniela Pittauerova; Bernd Hettwig; Helmut W Fischer
Quaternary Science Reviews | 2014
Stephan Steinke; Mahyar Mohtadi; Matthias Prange; Vidya Varma; Daniela Pittauerova; Helmut W Fischer
Radioprotection | 2011
Daniela Pittauerova; Bernd Hettwig; Helmut W Fischer
Journal of Marine Systems | 2014
Daniela Pittauerova; Gerald Kirchner; Dieter Garbe-Schönberg; Barak Herut; Ami Nishri; Helmut W Fischer
Radioprotection | 2009
Daniela Pittauerova; Stefan Mulitza; Bernd Hettwig; W. Chehade; Gesine Mollenhauer
Supplement to: Steinke, Stephan; Mohtadi, Mahyar; Prange, Matthias; Varma, Vidya; Pittauerová, Daniela; Fischer, Helmut W (2014): Mid- to Late-Holocene Australian-Indonesian summer monsoon variability. Quaternary Science Reviews, 93, 142-154, doi:10.1016/j.quascirev.2014.04.006 | 2014
Stephan Steinke; Mahyar Mohtadi; Matthias Prange; Vidya Varma; Daniela Pittauerova; Helmut W Fischer
Supplement to: Pittauerova, D et al. (2014): Radionuclides and recent sedimentation and mixing rates in Northern Gulf of Eilat/Aqaba, Red Sea. Journal of Marine Systems, 139, 1-8, https://doi.org/10.1016/j.jmarsys.2014.04.017 | 2014
Daniela Pittauerova; Gerald Kirchner; Carl-Dieter Garbe-Schönberg; Barak Herut; Ami Nishri; Helmut W Fischer