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- Möller, Per, et al.
(författare)
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Deglaciation history and subsequent lake dynamics in the Siljan region, south-central Sweden - LiDAR evidence and sediment records
- 2024
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The Siljan region hosts Europe´s largest impact structure. The high-relief landscape, with a central granite dome bordered by lake basins, contains an array of glacial and shore-level landforms. We investigated its deglaciation history by mapping and analysing landforms on high resolution LiDAR-based Digital Surface Models coupled with well-dated sediment successions from peat and lake sediment cores. The granite dome and bordering areas are characterized by streamlined terrain and ribbed moraine with a streamlined overprint. These suggest an ice-flow direction from NNW with wet-based thermal conditions prior to deglaciation. During its retreat, the ice sheet was split into thinner plateau ice and thicker basin ice. Sets of low-gradient glaciofluvial erosion channels suggest intense ice-lateral meltwater drainage across gradually ice-freed slopes, while 'down-the-slope' erosion channels and eskers show meltwater drainage from stagnated plateau ice. Thick basin ice receded with a subaqueous margin across the deep Siljan–Orsasjön Basin c. 10,700–10,500 cal. BP. During ice recession the ingression of the Baltic Ancylus Lake led to diachronous formation of highest shoreline marks, from 207 m in the south to 220 m a.s.l. in the north. Differential uplift resulted in shallowing of the water body, which led to the isolation of the Siljan¬–Orsasjön Basin from the Baltic Basin at c. 9800 cal. BP. The post-isolation water body – the ‘Ancient Lake Siljan' – was drained through the ancient Åkerö Channel with a water level at 168–169 m a.s.l. during c. 1000 years. A later rerouting of the outlet to the present course was initiated at c. 8800 cal. BP, which led to a lake-level lowering of 6–7 m to today’s level of Lake Siljan (162 m a.s.l.). This study shows the strength of an integrated methodological approach for deciphering the evolution of a complex landscape, combining highly resolved geomorphological analysis with well-dated sediment successions.
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| 3. |
- Andrén, T., et al.
(författare)
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The Baltic Sea IODP project
- 2012
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Ingår i: EGU General Assembly Conference Abstracts. ; , s. 7682-7682
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Björck, Fredrik, et al.
(författare)
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Cyber Resilience – Fundamentals for a Definition
- 2015
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Ingår i: New Contributions in Information Systems and Technologies. - Cham : Springer. - 9783319164854 - 9783319164861 ; , s. 311-316
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Konferensbidrag (refereegranskat)abstract
- This short paper examines the concept of cyber resilience from an organizational perspective. Cyber resilience is defined as “the ability to continuously deliver the intended outcome despite adverse cyber events”, and this definition is systematically described and justified. The fundamental building blocks of cyber resilience are identified and analyzed through the contrasting of cyber resilience against cybersecurity with regards to five central characteristics.
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| 6. |
- Göthberg, Martin, PhD, 1959-, et al.
(författare)
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Collaborative development in transforming drama text to stage text
- 2018
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Konferensbidrag (refereegranskat)abstract
- Collaborative development in transforming drama text to stage text Martin Göthberg, Cecilia Björck & Åsa MäkitaloUniversity of Gothenburg, SwedenIntroduction and aim With an interest in the creative and collaborative work achieved in and through theatre education, the overarching aim of this paper is to illuminate how joint understandings are established through social interaction in- and out-of-role, in a student theatre production where the centrality of text is significant. In most theatre productions, stage actors and directors collaboratively transform a drama text into a stage text (or ‘performance’). In rehearsals, actors strive to develop such understanding of situations that will be presented on stage. Theoretical framingAs Sawyer (2015, 253) argues, ‘[e]xplaining theatre creativity requires a sociocultural approach, because the explanation has to be based in the interpersonal dynamics among the actors’. We conceptualize theatre production as a goal oriented and co-creative activity where the presentation of the stage text requires an elaborated joint text understanding. Mutual understanding of a social situation is always dynamic and underway among participants who engage in a range of communicative projects (Linell 1998) to move the activity forward. Meaning making in such activities is further seen as achieved through the material-semiotic means that become salient in pursuing joint activities in situ as part of cultural practices (Vygotsky 1978; 1999; 2004). Empirical case, data and analysesThe empirical material originates from one year of ethnographic fieldwork conducted at an upper secondary school in Sweden where the participants worked with the staging of Molière’s drama The Affected Ladies from 1658 (Göthberg, 2015). For this study, we have drawn on the video data, that provides access to sessions from the first reading of Molière’s text to the final performance. We selected instances of student initiated role-play situations for analysis and scrutinized how joint text understanding was interactively established as communicative projects among the participants by focusing on salient mediational means such as gestures, movements, facial expressions, tone-of-voice and speech.Towards a stage text: transitions of understandingThe drama text served as a pivot, which provided given circumstances (Stanislavski 2017). However, what was ‘given’ had to be thoroughly negotiated in order to coordinate text understanding that would allow for convincing in-role interaction in the stage text (cf. Bergman Blix 2010). Coordinated ensemble work came about in tangible ways by holding hands, imitating voice, noticing postures, exploring manners, articulating interpretations (often bridging between Molière’s text and contemporary culture), and by doing things with things. In-role and out-of-role interaction was intertwined, and joint understandings emerged in layers of communicative projects. Educational significanceWe conclude that the participants in this kind of educational activity put considerable joint effort into making ensemble text understanding more explicit. Another conclusion is that the students have to be very knowledgeable in navigating the extraordinary complexity of intertwined communicative projects. We suggest that drama-text based interaction in-role may provide educational potential in the field of developing text understanding.ReferencesBergman Blix, Stina. 2010. Rehearsing Emotions: The Process of Creating a Role for the Stage. Stockholm : Stockholm University. Göthberg, Martin. 2015. Pimpa Texten. En etnografisk studie av gymnasieelevers meningsskapande i dramatext. http://hdl.handle.net/2077/41363John-Steiner, Vera, Cathrene M Connerey and Ana Marjanovic-Shane. 2010. Vygotsky and creativity: a cultural-historical approach to play, meaning making, and the arts. New York: Peter Lang. Linell, Per.1998. Approaching dialogue: talk, interaction and contexts in dialogical perspectives. Philadelphia: John Benjamins Publishing.Molière and Per Sjöstrand. 1986. De löjliga preciöserna komedi i en akt [The Affected Ladies]. Stockholm: The Royal Dramatic Theatre.Sawyer, Keith R. 2015. “Drama, theatre and performance creativity.” In Dramatic Interactions in Education: Vygotskian and Sociocultural Approaches to Drama, Education and Research, edited by Susan Davis, Beth Ferholt, Hanna Grainger Clemson, Satu-Mari Jansson and Ana Marjanovic-Shane, 245-260. London: Bloomsbury Academic.Stanislavski, Konstantin Sergeevič. 2017. An Actor's work. Abingdon, Oxon: Routledge. Vygotsky, Lev Semenovič. 1978. Mind in society: the development of higher psychological processes. Cambridge, Mass.: Harvard U.P..Vygotsky, Lev Semenovič. 1999. On the problem of the psychology of the actor’s creative work. In R. W. Rieber (Ed.), The collected works of L. S. Vygotsky (Vol. 6) 237-244. New York, NY: Plenum Press.Vygotsky, Lev Semenovič. 2004. “Imagination and Creativity in Childhood.” Journal of Russian & East European Psychology 42 (1): 7-97. doi: 10.1080/10610405.2004.11059210
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| 7. |
- Hanslik, Daniela, et al.
(författare)
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A high resolution Late Glacial and Postglacial record from the central Lomonosov Ridge, Arctic Ocean
- 2008
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Ingår i: Second Conference on Arctic Palaeoclimate and its Extremes (APEX).
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Core HLY0503-18TC used for this study was taken during the 2005 Healy-Oden Trans-Arctic Expedition (HOTRAX) on the central Lomonosov Ridge. The coring site is located in a local “Intra Basin”, a >1000 m deep depression in the ridge morphology, where sedimentation appears to be focused and accumulation rates, thus, are higher (Björk et al., 2007). The uppermost 70 cm of core HLY0503-18TC contains high abundances of well preserved planktonic and benthic foraminifera and calcareous nannofossils. The planktonic foraminifera assemblage in the >125 μm size fraction is monospecific and consists of Neogloboquadrina pachyderma, of which >95% are of the left-coiling variety. Stable isotope measurements of the >150 μm size fraction on N. pachyderma (s) show a distinct δ13C minimum at 35-40 cm depth. Similar changes in δ13C in previous studies have been associated with a major melt water anomaly at the beginning of Termination I (Nørgaard-Pedersen et al., 1998; Stein et al., 1994). We also see other signs for a significant shift at this depth, such as low foraminifera abundance and a change in the coccolith assemblage (Fornaciari et al., 2006). To establish an age model for core HLY0503-18TC radiocarbon dating was performed on nine very small planktonic and benthic foraminifera samples at Lund University Radiocarbon Dating Laboratory. The results indicate Holocene/Late Glacial ages for the samples in the upper half of the core. The oldest non-infinite 14C-dating provided an age of ~14 cal ka BP on a sample at 32 cm depth (Marine04 calibration data set). However, the highly incoherent ages of planktonic and benthic foraminifer at 12 cm depth imply high reservoir ages for at least deeper Arctic waters, showing that caution is needed when a 14C based chronology is established on Arctic marine sediments. All 14C measurements below 42 cm core depth yielded infinite ages (>44 ka). This large shift of more than 30 kyr over a few centimeters suggests a hiatus, either in form of no/low sedimentation or erosion due to changes in the paths or strength of the bottom currents. The abundance of foraminifera and the nannofossil composition of the sediments between 40 and 70 cm core depth suggests that this part of the core belongs to either marine isotope stage 3 or 5 (Fornaciari et al., 2006). This implies that at least entire MIS 2 may be missing in the core.
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| 8. |
- Hanslik, Daniela, et al.
(författare)
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Radiocarbon calibration of a high resolution core from the Central Arctic Ocean
- 2008
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Ingår i: EOS Transactions: American Geophysical Union. ; , s. PP51A-1483
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The big challenge in calibrating radiocarbon dates to calendar years for Arctic Ocean deep sea sediments is to estimate the marine reservoir age of the water masses. Most sediment cores from the central Arctic Ocean have a low resolution and the preserved record for the last 25 ka is in the order of 10-20 cm. Therefore, most AMS 14C dating results are presented either uncalibrated or corrected. The used reservoir values often vary between 400 and 550 years, close to the global mean ocean reservoir age, since all available regional reservoir differences (ΔR) are from coastal areas around the Arctic Ocean. Our study presents 14C ages and calibration attempts with different modelled reservoir ages from a high resolution record of Holocene and Late Glacial sediments from the Lomonosov Ridge. During the 2005 Healy-Oden Trans-Arctic Expedition (HOTRAX) an area of the central Lomonosov Ridge, between about 88°15’–89°N and 140°–180°E, was cored where a >1000 m deep depression characterizes the ridge morphology. Calcareous nannofossils (Fornaciari and Backman in prep.) and foraminifera analyzed in the upper 70 cm of core HLY0503-18TC show a sequence of the last ~130 ka. The chronology has been established through the nannofossil record in the lower 30 cm (Fornaciari and Backman in prep.) and 14C dating in the upper 40 cm. The data indicate very high accumulation rates during the Late Glacial of ~10 cm/ka, and times of extremely low to no accumulation during the Last Glacial Maximum, MIS 4 and parts of MIS 5. In addition, 14C dating on benthic and planktonic foraminifera from the same depth in the sediment core reveals age differences between surface and deep water masses. The age difference of such benthic-planktonic pairs shows a succession of ~1200 year older bottom watera in the Late Glacial to ~250 year in the late Holocene. This indicates circulation and/or ventilation changes through the last deglaciation and Holocene, which we hopefully will be able to date in greater detail with better model estimates of temporal changes in marine reservoir ages.
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