Date prints on stranded macroplastics: Exploring the potential of marine litter assemblages as chronological markers in recent coastal deposits


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lasse.sander [ at ] awi.de

Abstract

Plastic is a collective term describing a group of synthetic materials developed from the early 1900s onward. The mass production of plastics began in the 1950s and already in the 1970s, the magnitude of plastic pollution has been recognized as an issue of concern for the global marine environment. Today, it is no longer a rare event to encounter plastic fragments and objects in modern coastal deposits. The presence of any form of plastic holds in itself a chronological indication (i.e. the deposit is younger than the invention of plastic). Larger items can be surveyed as discrete objects and allow the retrieval of more precise, though indirect age-information, such as production-date prints (i.e. the deposit is younger than the encountered litter item). The potential of this approach was tested in an investigation into the spatial distribution of stranded macroplastics in recent overwash deposits in SW Denmark. An amount of >110 georeferenced surface samples containing date prints were surveyed in summer 2015. Objects with ages from the late 1970s until 2014 were encountered. The distribution of the litter was clearly non-random in relation to overwash morphology, and based on the collected samples, it was possible to reconstruct indication on both the timing and the extent of extreme events since the 1990s. These observations were cross-compared with a dense time series of satellite images and orthophotos. It is proposed that an improved interpretation of indications from the plastic record may be obtained by broader surveys including additional parameters, such as the exact location, elevation, chemical composition, assemblage, origin, product design, decay, fracturing or the colonization by marine sessile organisms, from all encountered macroplastic objects. If calibrated properly, the plastic assemblages may serve as fast, cheap and reliable chronological markers in recent coastal deposits.



Item Type
Conference (Poster)
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Research Networks
Publication Status
Published
Event Details
AGU Falle Meeting 2016, 12 Dec 2016 - 16 Dec 2016, San Francisco CA, USA.
Eprint ID
42879
Cite as
Sander, L. (2016): Date prints on stranded macroplastics: Exploring the potential of marine litter assemblages as chronological markers in recent coastal deposits , AGU Falle Meeting 2016, San Francisco CA, USA, 12 December 2016 - 16 December 2016 .


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