62 research outputs found

    Het handgevormde aardewerk uit de ijzertijd en de Romeinse tijd van Oss-Ussen. Studies naar typochronologie, technologie en herkomst

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    The primary objective of the investigation of the handmade pottery from Oss-Ussen was the composition of a detailed type-chronology of the locally produced pottery, preferably applicable to a wider area than the Maaskant region. On basis of pottery assemblages from pits, wells etc. fourteen pottery phases have been defined (A2-N). They cover almost a millennium, starting around the beginning of the Early Iron Age (800 BC). For sixteen variables, mainly concerning morphology and decoration, developments in type-frequencies are presented in diagrams. The secondary analysis of the technological characteristics of this local ware did not reveal any significant differences between fine and coarse ware, considering both clay texture and temper. Another secondary study has been devoted to a rather large group of non-local handmade pottery, coming from the western coastal zone, in most cases probably containing seasalt (briquetage vessels). Its provenance has been established by combining diatom analyses and morphological characteristics. Moreover, shifts in supply routes are indicated on basis of chemical analyses (XRF). These may partly explain the changes in morphological types found in settlement sites in the hinterland.Nederlandse Organisatie voor Zuiver-Wetenschappelijk OnderzoekFdA – Publicaties niet-programma gebonde

    Changes in the firn structure of the western Greenland Ice Sheet caused by recent warming

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    Atmospheric warming over the Greenland Ice Sheet during the last 2 decades has increased the amount of surface meltwater production, resulting in the migration of melt and percolation regimes to higher altitudes and an increase in the amount of ice content from refrozen meltwater found in the firn above the superimposed ice zone. Here we present field and airborne radar observations of buried ice layers within the near-surface (0–20 m) firn in western Greenland, obtained from campaigns between 1998 and 2014. We find a sharp increase in firn-ice content in the form of thick widespread layers in the percolation zone, which decreases the capacity of the firn to store meltwater. The estimated total annual ice content retained in the near-surface firn in areas with positive surface mass balance west of the ice divide in Greenland reached a maximum of 74 ± 25 Gt in 2012, compared to the 1958–1999 average of 13 ± 2 Gt, while the percolation zone area more than doubled between 2003 and 2012. Increased melt and column densification resulted in surface lowering averaging −0.80 ± 0.39 m yr−1 between 1800 and 2800 m in the accumulation zone of western Greenland. Since 2007, modeled annual melt and refreezing rates in the percolation zone at elevations below 2100 m surpass the annual snowfall from the previous year, implying that mass gain in the region is retained after melt in the form of refrozen meltwater. If current melt trends over high elevation regions continue, subsequent changes in firn structure will have implications for the hydrology of the ice sheet and related abrupt seasonal densification could become increasingly significant for altimetry-derived ice sheet mass balance estimates

    Crematiegraven uit de vroege ijzertijd in Nijmegen-Lent : archeologisch onderzoek aan de Steltsestraat

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    Romeinse resten in Nijmegen-Lent : Onderzoek van nederzettingssporen aan de Steltsestraat

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    Een Hofstede op De Boel in Nijmegen-Noord

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