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- Olsson, Mikael, 1948
(författare)
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Polaris : Möten med världens poler www.polarisen.se
- 2009
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Ingår i: http://www.polarisen.se. - Göteborg : University of Gothenburg.
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Polaris is a Swedish based web site dealing with Antarctic, Arctic and sub-polar areas around the globe, including sub-Arctic regions of Scandinavia and Eurasia. Polaris is focusing on peoples and places, research and resources on high latitudes. In particular, the site's ambition is to depict the interaction between the components and put them in a context of global environmental and climate change. The web site also addresses the Swedish polar and mountain research, exemplified by the depiction of a number of Swedish polar researchers' work and choice of career. Polaris main target group is high school students. We aim at establishing Polaris as the popular web site in Sweden for polar research. Polaris was a joint production by Gothenburg and Stockholm Universities and others during the International Polar Year 2007-09. The initiative to the website was taken by the Swedish Committee for International Polar Year, the Swedish Research Council and the Universeum Science Center in Gothenburg. There are many scientific contributors, mainly from the Centre of Earth Systems Science at the University of Gothenburg, the Tarfala Research Station at Stockholm University and the Swedish Polar Research Secretariat . Interviews and articles are made by professional science writers. All texts are in Swedish.
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| 4. |
- Margold, Martin, 1981-, et al.
(författare)
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Late-glacial ice dynamics of the Cordilleran Ice Sheet in northern British Columbia and southern Yukon Territory : retreat pattern of the Liard Lobe reconstructed from the glacial landform record
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The Liard Lobe formed a part of the northeastern sector of the Cordilleran Ice Sheet and drained ice from accumulation areas in the Selwyn, Pelly, Cassiar and Skeena mountains. This study reconstructs the ice retreat pattern of the Liard Lobe during the last deglaciation from the glacial landform record that is comprised of glacial lineations and landforms of the meltwater system such as eskers, meltwater channels, perched deltas and outwash fans. The spatial distribution of these landforms defines the successive configurations of the ice sheet during the deglaciation. The Liard Lobe retreated to the west and southwest across the Hyland Highland from its local Last Glacial Maximum position in the southeastern Mackenzie Mountains where it coalesced with the Laurentide Ice Sheet. The retreat across the Liard Lowland and a subsequent splitting of the thus far uniform ice surface into several ice lobes is evidenced by large esker complexes that stretch across the Liard Lowland cutting across the contemporary drainage network. Ice margin positions from the late stage of deglaciation are reconstructed locally at the foot of the Cassiar Mountains and farther up-valley in an eastern facing valley of the Cassiar Mountains. The presented landform record indicates that the deglaciation of the Liard Lobe was accomplished mainly by active ice retreat and that ice stagnation did not play a significant role in the deglaciation of this region.
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| 5. |
- Staal, Arie, et al.
(författare)
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Global terrestrial moisture recycling in Shared Socioeconomic Pathways
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The global water cycle has undergone considerable changes since pre-industrial times due to global climate change and land-use changes. These drivers will almost certainly continue to change during the course of this century. However, where, how, and to which extent terrestrial moisture recycling will change as a result remains unclear.Mutually consistent scenarios of climate change and land-use changes for the 21st century are provided by the Shared Socioeconomic Pathways (SSPs). The SSPs provide a framework of five different narratives involving varying degrees of challenges associated with mitigation or adaptation. From each narrative follow different implications for emissions, energy, and land use. The SSPs serve as the conceptual framework behind the sixth generation of the Coupled Model Intercomparison Project, CMIP6.Terrestrial moisture recycling is often assessed using atmospheric moisture tracking models. An example is UTrack, a Lagrangian model to track moisture through three-dimensional space. Here we present a new forward-tracking version of UTrack that is forced by output of a CMIP6 model to study how terrestrial moisture recycling may change across the globe until the end of the 21st century in a range of SSPs, from mild to severe: SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5. For this forcing, we chose the Norwegian Earth System Model version 2, or NorESM2. It has a temporal resolution of one day and a spatial resolution of 1.25° × 0.9375° at eight pressure levels.We find that across the 21st century, the global terrestrial moisture recycling ratio decreases with the severity of the Shared Socioeconomic Pathways (SSPs). We calculate a decrease in global terrestrial precipitation recycling by 2.1% with every degree of global warming. Because the SSPs represent internally consistent scenarios of both global warming and global land cover changes, it is hard to distinguish the relative contributions of these two, but the evidence points at a major influence of global warming on moisture recycling.We find spatial differences in trends in recycling ratios, but which are broadly consistent among SSPs. If a change in precipitation (either drying or wetting) coincides with an increase in terrestrial precipitation recycling ratio, we call it land-dominated. We call the change in precipitation ocean-dominated if it coincides with a decrease in terrestrial precipitation recycling ratio. Land dominance tends to occur in regions with already large terrestrial precipitation recycling ratios, mainly interior South America (land-dominated drying) and eastern Asia (land-dominated wetting). Land-dominated drying may also happen in eastern Europe, in central America and in subtropical sub-Saharan Africa. Ocean-dominance, mainly in the form of wetting, is found primarily in the high northern latitudes and in central Africa.We also simulated the changes in basin recycling for the 27 major river basins of the world, confirming the overall tendency of decreasing recycling with severity of the SSP, as well as its spatial variations.
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| 7. |
- Norrman, Jenny, 1971
(författare)
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Dokumentation workshop geosystemtjänster - ekosystemtjänster
- 2019
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Dokumentation av workshop gällande att diskutera begreppen ekosystemtjänster och geosystemtjänster Plats: Chalmersska huset i Göteborg, Kanalrummet. Datum och tid: 29 augusti, kl 11.30-15.30 Bakgrund: Utifrån pågående forskning på Chalmers om undermarken som en multifunktionell resurs ser vi ett behov av att kunna systematiskt beskriva alla typer av tjänster undermark som naturen tillhandahåller med syftet att kunna ta bättre och mer hållbara beslut angående hur dessa tjänster/resurser skall nyttjas. Flera av dessa tjänster är biotiska och klassas då som ekosystemtjänster (ES). Andra typer av tjänster såsom t.ex. geoenergi, utrymme, bärförmåga, arkeologiska och geologiska arkiv är inte biotiska och kan därför principiellt inte betecknas vara ES. Hur bör man då beskriva dessa på bästa sätt så att man kan få en helhetsbild över undermarkens tjänster? Vi ser att begreppet geosystemtjänster förmodligen kan fånga in detta och skulle kunna vara ett bra ramverk. Men är det bra eller mindre bra att introducera nya begrepp? Hur ser andra organisationer som arbetar med ES på att föra in ett nytt begrepp? Liknande frågeställningar uppstår när man t.ex. arbetar inom vattenförvaltning där flera av vattnets tjänster är abiotiska, där t.ex. begreppet grundvattentjänster används ibland och som innefattar både biotiska och abiotiska tjänster. Syfte: Att samla representanter från olika organisationer som arbetar med och berörs av arbetet med ES för att dela erfarenheter och kunskap omkring ES och vad som inte fångas in under begreppet ES, om detta är ett problem eller ej för de olika organisationerna, och hur man ser på att föra in nya begrepp och nyttan med det. Upplägg: Ett antal korta föredrag för att introducera alla till frågeställningen, hur de olika organisationerna arbetar med ekosystemtjänster (ES) idag och deras roller. Därefter diskussion utifrån ett antal frågeställningar. Inbjudningslista: Representanter ifrån Sveriges geologiska undersökning, Statens geotekniska institut, Boverket och Naturvårdsverket, forskare (Chalmers), kommuner (Malmö, Göteborg), HaV och Vattenmyndigheterna.
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- Lindgren, Amelie, et al.
(författare)
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Reconstructing past vegetation with Random Forest Machine Learning, sacrificing the dynamic response for robust results
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Vegetation is an important feature in the Earth system, providing a direct link between the biosphere and atmosphere. As such, a representative vegetation pattern is needed to accurately simulate climate. We attempt to reconstruct past and present vegetation with a data driven approach, to test if this allows us to create robust global and regional vegetation patterns. The motivation for this stems from the possibility of avoiding circular arguments when studying past time periods where vegetation is used to reconstruct climate, and climate is used to construct vegetation. By using the Random Forest machine learning tool, we train the vegetation reconstruction with available biomized pollen data of present and past conditions and are able to produce reasonable broad-scale vegetation patterns for the Pre-Industrial and the Mid-Holocene together with a few modeled climate variables. We test the methods robustness by introducing a systematic temperature bias based on existing climate model spread and compare the result with that of LPJ-GUESS, a process-based dynamic global vegetation model. Results prove that the Random Forest approach is able to produce robust patterns for periods and regions well constrained by evidence, but fails when evidence is scarce. The robustness is achieved by sacrificing a dynamic vegetation response to a changing climate.
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| 9. |
- Sonesten, Lars
(författare)
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Vattenkvaliteten i Storvänern
- 2013
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Ingår i: Rapport - Vänerns vattenvårdsförbund. - 1403-6134. ; 77, s. 28-31
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Annan publikation (övrigt vetenskapligt/konstnärligt)
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