| 1. |
- Ferraro, Mattia, et al.
(author)
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Multi-century reconstruction of environmental conditions in Lurefjorden, Norway.
- 2024
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In: 24th Nordic Geological Winter Meeting, 10-12th Jan, 2024, Gothenburg, Sweden.
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Conference paper (other academic/artistic)abstract
- Benthic foraminiferal assemblages are identified to reconstruct changes in environmental conditions over the last few centuries in Lurefjorden, a western Norwegian fjord. From ca. 1970 until present days the relative abundance of Brizalina skagerrakkensis, an efficient bio-indicator for organic matter fluxes, is enhanced relative to the preceding time interval. Hence, our results suggest that there is an increase of the organic matter within the Lurefjorden basin in the last 50 years. Over the same period, there is also an increase in the absolute abundance of agglutinated species, indicating lower oxygen concentration in the water. A lowering of the oxygen concentrations may have taken place as a response of a greater oxygen consumption caused by a higher organic matter supply in the water column. Accoridng to Aksnes (2009), Lurefjorden was subject to an increased freshening of Norwegian coastal waters (NCW), which has led to a decrease in sunlight penetration into the water column, affecting the oxygen levels and the behavior of marine life within the basin, between 1935 and 2007. Furthermore, we used diversity indices to study the ecological status of the area, showing significant growth in diversity, abundance, and richness within the benthic foraminiferal community over the past 50 years. Our observations highlight that an increase in the input of organic matter over the last century has led to a change in the benthic foraminifera community in the Lurefjorden basin.
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| 2. |
- Munthe, Christian, 1962
(author)
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Jordens framtid – eller människans?
- 2019
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In: Ett HUM Om – Världskulturmuseet, Göteborg, 20 november, 2019..
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Conference paper (other academic/artistic)
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| 3. |
- Aldenhoff, Wiebke, 1985, et al.
(author)
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COMPARISON OF SENTINEL-1 SAR AND SENTINEL-3 ALTIMETRY DATA FOR SEA ICE TYPE DISCRIMINATION
- 2019
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In: IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. - 9781538691540
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Conference paper (other academic/artistic)abstract
- In this paper near co-incidental Sentinel-1 C-band SAR imagery and Sentinel-3 SRAL Ku-band altimeter data are compared for their capabilities of sea ice type discrimination. Knowledge of sea ice type is important for climate research and safety in Arctic offshore operations. First-year ice is characterised by a low SAR backscatter intensity in both HH and HV polarisation compared to multi-year ice, while the altimeter waveform parameters show high pulse peakiness and peak power compared to multi-year ice. Thus SAR imagery and altimetry can principally discriminate different ice types. The complexity of the backscattered radar signal however impedes a clear separation of the two types for all cases. Cross comparison of the two sensors offers an opportunity of high resolution validation data, which is often lacking for sea ice studies.
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| 4. |
- Antonsen, Simen, et al.
(author)
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Atmospheric Chemistry of tert-butylamine and AMP
- 2017
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In: Energy Procedia. Volume 114, 2017, Pages 1026-103213th International Conference on Greenhouse Gas Control Technologies, GHGT 2016; Lausanne; Switzerland; 14 November 2016 through 18 November 2016. - : Elsevier BV. - 1876-6102.
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Conference paper (peer-reviewed)abstract
- © 2017 The Authors. The atmospheric chemistry of (CH 3 ) 3 CNH 2 (tert-butylamine, tBA) and (CH 3 ) 2 (CH 2 OH)CNH 2 (2-amino-2-methyl-1-propanol, AMP) has been studied by quantum chemistry methods and in photo-oxidation experiments in the EUPHORE chamber in Valencia (Spain). Aerosol formation and composition has been quantified. Yields of nitramines and other products in the photo-oxidations have been determined and complete photo-oxidation schemes including branching between the major reaction routes have been obtained. Published by Elsevier Ltd.
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| 5. |
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| 6. |
- Stevens, Rodney L., 1951, et al.
(author)
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REMOTE ASSESSMENT OF SUSTAINABLE GROUNDWATER RESOURCES USING KAREZES (QANATS), NORTH OF KANDAHAR, AFGHANISTAN
- 2021
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In: International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM Vol. 21, Iss. 3.2. - 1314-2704.
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Conference paper (peer-reviewed)abstract
- Karezes represent a sustainable water supply since their discharge is regulated by the natural groundwater renewal in the mountains and on upslope surfaces in the valleys. Although most karezes have become inactive due to lowered groundwater levels, they can still be used together with other accessible information sources to initially and remotely interpret basin geohydrology and the groundwater resources when they were constructed (and today if still active). This is mainly done by using karezes to map the depth and slope of the groundwater table. Also, spatial and temporal changes in the water supply from karezes can indicate changing climatic and anthropogenic influences on groundwater resources. The aim of this paper is to present an approach that combines the “karez archive” of hydrogeological information with other, assessable information sources, such as topographic and climatic databases. Endemic knowledge is stressed as an importance and practical verification of the assessment, as well as a crucial component of the applications toward sustainable water management. The basin-specific conditions interpreted are most important in regions with poor data control for modeling basin hydrology. The characterization and combination of information sources is exemplified using karezes NW of Kandahar, Afghanistan.
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| 7. |
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| 8. |
- Iranezhad, Masoud, et al.
(author)
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Hydrological Feasibility of Flood Barriers to Protect the Gothenburg (Sweden) during the 21st Century - An Initial Assessment
- 2014
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In: Conference: XXVIII Nordic Hydrological Conference, Nordic Water 2014: The Nordic Hydrology Model - Linking science and practice, At Stockholm, Sweden, 11-13 August 2014.
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Conference paper (other academic/artistic)abstract
- Climate change due to increasing of greenhouse gas emissions to the atmosphere will cause mean sea level to rise about +1 m by 2100. To prevent coastal floods resulted from the sea level rising, different flood control structures have been built and showed acceptable protection levels at least so far; e.g. Thames Barrier in London, UK. Gothenburg city on the south-west coast of Sweden, with the Göta älv River running through it, is one of vulnerable cities to the accelerated sea level rise. Besides, a high tide in southern Sweden will be increased to +2 m above the current sea level by 2100. Hence, most parts of Gothenburg will experience flooding events during the 21st century, even the City Planning Office of Gothenburg suggests +2.5 m above the current sea level as the safe level for setting the shelter of especially important facilities by 2100. Developing water level model by MATLAB, we investigated the hydrological feasibility of using flood barriers in the Göta älv River to protect the Gothenburg city against flooding events during this century. One flood control barrier at the river upstream (upstream barrier) in the Gothenburg region and a sea barrage (Göta älv barrage) at the entrance point of the river to the North Sea were suggested by this study. Considering three operational scenarios for these barriers, the highest sea level was estimated to +2.95 m above the current mean sea level by 2100. To prove flood protection against such high sea levels, both barriers have to be closed. In order to prevent high water levels in the Göta älv reservoir due to the runoff generation from rainfall, the barriers would be open when the sea level is low. This preliminary assessment concluded the suggested sea and flood barriers would successfully protect the Gothenburg city from flooding events during the 21st century.
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| 9. |
- Jakobson, E., et al.
(author)
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Diurnal variability of precipitable water in the Baltic region
- 2007
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In: Proceedings of the Fifth Study Conference on BALTEX, Ed. H.J. Isemer, International BALTEX Secretariat, GKSS Research Center, Geesthacht, Germany. - 1681-6471. ; :38, s. 119-120
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Conference paper (other academic/artistic)
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| 10. |
- Bagherbandi, Mohammad, Professor, et al.
(author)
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Mantle viscosity derived from geoid and different land uplift data in Greenland
- 2022
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Conference paper (other academic/artistic)abstract
- The Earth’s mass redistribution due to deglaciation and recent ice sheet melting causes changes in the Earth’s gravity field and vertical land motion in Greenland. The changes are because of ongoing mass redistribution and related elastic (on a short time scale) and viscoelastic (on time scales of a few thousands of years) responses. These signatures can be used to determine the mantle viscosity. In this study, we infer the mantle viscosity associated with the glacial isostatic adjustment (GIA) and long-wavelength geoid beneath the Greenland lithosphere. The viscosity is determined based on a spatio-spectral analysis of the Earth’s gravity field and the land uplift rate in order to find the GIA-related gravity field. We used and evaluated different land uplift data, i.e. the vertical land motions obtained by the Greenland Global Positioning System (GPS) Network (GNET), GRACE and Glacial Isostatic Adjustment (GIA) data. In addition, a combined land uplift rate using the Kalman filtering technique is presented in this study. We extract the GIA-related gravity signals by filtering the other effects due to the deeper masses i.e. core-mantle (related to long-wavelengths) and topography (related to short-wavelengths). To do this, we applied correlation analysis to detect the best harmonic window. Finally, the mantle viscosity using the obtained GIA-related gravity field is estimated. Using different land uplift rates, one can obtain different GIA-related gravity fields. For example, different harmonic windows were obtained by employing different land uplift datasets, e.g. the truncated geoid model with a harmonic window between degrees 10 to 39 and 10 to 25 showed a maximum correlation with the GIA model ICE-6G (VM5a) and the combined land uplift rates, respectively. As shown in this study, the mantle viscosities of 1.6×1022 Pa s and 0.9×1022 Pa s for a depth of 200 to 650 km are obtained using ICE-6G (VM5a) model and the combined land uplift model, respectively, and the GIA-related gravity potential signal.
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