• Benthic foraminiferal investigations in Middle to Late Quaternary sections of Kongsfjordhallet, north-west Svalbard 

      Chatterjee, Debolina; Ghosh, Anupam; Alexanderson, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-29)
      Stratigraphic sites in north-west Svalbard record at least six significant glacial advances in the last 200 Ky, and sediments deposited under locally high relative sea level during intervening interstadials or interglacials contain abundant benthic foraminifera. We present a biostratigraphic record from the Kongsfjordhallet site in the Kongsfjorden area that covers five high relative sea-level events ...
    • Dynamics of a retreating ice sheet: a LiDAR study in Värmland, SW Sweden 

      Goodship, Alastair; Alexanderson, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-11)
      Värmland in south western Sweden lies across the established zone of marine-terrestrial transition of the Scandinavian Ice Sheet (SIS) margin. The region lies inside the Younger Dryas maximum limit reached at 12.7 cal ka BP and the area of rapid final SIS retreat from 11.5 cal ka BP. LiDAR data across Värmland allows more detailed observation and analysis of glacial landforms formed during this stage ...
    • Holocene relative shore-level changes and development of the Ģipka lagoon in the western Gulf of Riga 

      Rosentau, Alar; Grudzinska, Ieva; Kalińska, Edyta; Alexanderson, Helena; Bērziņš, Valdis; Ceriņa, Aija; Kalniņa, Laimdota; Karušs, Jānis; Lamsters, Kristaps; Muru, Merle; Nartišs, Māris; Paparde, Līga; Hang, Tiit (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-13)
      Holocene relative shore-level changes and development of the G ipka palaeolagoon in the western Gulf of Riga are reconstructed using multiproxy analyses by combining litho-, biostratigraphical and chronological data with remote sensing and geophysical data. The results show the development of the G ipka basin from the Ancylus Lake/Initial Litorina Sea coastal zone (before c. 9.1 cal. ka BP) to ...
    • Luminescence characteristics of Scandinavian quartz, their connection to bedrock provenance and influence on dating results 

      Alexanderson, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-23)
      The success of optically stimulated luminescence (OSL) dating relies to a large extent on suitable characteristics of the analysed mineral, in this case quartz. Previous OSL dating of Quaternary sediments in Scandinavia has shown that quartz characteristics vary widely across the region, resulting in dating studies with varied success. The aim of this study is to provide an overview of quartz ...
    • Luminescence dating of holocene siliciclastic sediments in eastern Dahomey Basin, southwestern Nigeria 

      Fakolade, Richard O.; Ikhane, Philip R.; Zhao, Qiuyue; Hao, Qingzhen; Alexanderson, Helena; Guo, Zhengtang (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-02)
      Several attempts at reconstructing geological settings and palaeoclimatic changes of the siliciclastic deposits of the Dahomey Basin, SW Nigeria, using relative age dating and correlation methods, have resulted in serious discrepancies on the ages. Therefore, a chronology framework established by an absolute age dating method is requisite to constrain the geological interpretation. This research ...
    • MIS 3 age of the Veiki moraine in N Sweden – Dating the landform record of an intermediate-sized ice sheet in Scandinavia 

      Alexanderson, Helena; Hättestrand, Martina; Lindqvist, Mimmi A.; Sigfúsdóttir, Thorbjörg (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-14)
      The Veiki moraine in northern Sweden, a geomorphologically distinct landscape of ice-walled lake plains, has been interpreted to represent the former margin of an intermediate-sized pre–Last Glacial Maximum (LGM) Fennoscandian ice sheet, but its age is debated as either marine isotope stage (MIS) 5c or MIS 3. We have applied optically stimulated luminescence (OSL) and radiocarbon dating to four sites ...
    • The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site 

      Kalińska, Edyta; Alexanderson, Helena; Krievāns, Māris (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-08)
      In interstadial deposits, sand interbeds gain limited consideration in comparison with organic sediments, and therefore tend to be underrepresented in paleoenvironmental reconstructions. The Raunis site, central-eastern Latvia, is an example where organic beds have already gained some attention and been used to understand the complex interactions between advance and retreat of the Scandinavian Ice ...
    • Storm chasing: Tracking Holocene storminess in southern Sweden using mineral proxies from inland and coastal peat bogs 

      Kylander, Malin E.; Martínez-Cortizas, Antonio; Sjöström, Jenny K.; Gåling, Jenny; Gyllencreutz, Richard; Bindler, Richard; Alexanderson, Helena; Schenk, Frederik; Reinardy, Benedict T.I.; Chandler, Benjamin M.P.; Gallagher, Kerry (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-25)
      Severe extratropical winter storms are a recurrent feature of the European climate and cause widespread socioeconomic losses. Due to insufficient long-term data, it remains unclear whether storminess has shown a notable response to changes in external forcing over the past millennia, which impacts our ability to project future storminess in a changing climate. Reconstructing past storm variability ...
    • Transferring grains from single-grain luminescence discs to SEM specimen stubs 

      Doverbratt, Isa; Alexanderson, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-21)
      The grain transfer protocol presents a step-by-step guide on how to successfully transfer positioned grains from a single-grain luminescence disc to a scanning electron microscope (SEM) specimen stub and how to transport them between laboratories. Single-grain luminescence analysis allows the determination of luminescence characteristics for individual sand-sized grains. By combining such luminescence ...