HOLOCENE RELATIVE SEA-LEVEL CHANGES IN SOUTH HINNØYA, ARCTIC NORWAY ...

• Main Author: Barnett, Robert Langdon
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: University of Plymouth 2013
• Subjects: Sea level; Testate amoebae; Foraminifera; GIA; Salt marsh; Arctic; Hinnøya; Norway; Storosen; Svinøyosen; Vesterålen; Foraminifera*
• Online Access: https://dx.doi.org/10.24382/3045; https://pearl.plymouth.ac.uk/handle/10026.1/2771

This study develops techniques for the preparation and counting of testate amoebae for Holocene sea-level reconstructions. In addition, this study provides a ~3000 year relative sea-level reconstruction for south Hinnøya in the Vesterålen islands off mainland Norway, adding new data to a poorly defined period of the Holocene sea-level history of north-western Norway. This is important to quantify rates of glacial-isostatic adjustment (GIA), to refine GIA models, and to establish baseline (pre-industrial) rates of relative sea-level change. Surface sediments from two salt marshes (Storosen and Svinøyosen) in south Hinnøya are used to assess the effects of using different preparation procedures and count totals when analysing for testate amoebae. Analytical efficiency can be improved upon by using a mild alkali, chemical disaggregant (5 % KOH) to break up fibrous salt-marsh sediment and concentrate tests prior to counting. A count total of 100 individuals, rather than 150, can be used to make time gains with ...