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- Andersson, Maria, 1980, et al.
(författare)
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Enhanced concentrations of dissolved gaseous mercury in the surface waters of the Arctic Ocean
- 2008
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Ingår i: Marine Chemistry. - : Elsevier BV. - 0304-4203. ; 110:3-4, s. 190-194
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Tidskriftsartikel (refereegranskat)abstract
- During an almost three months long expedition in the Arctic Ocean, the Beringia 2005, dissolved gaseous mercury (DGM) was measured continuously in the surface water. The DGM concentration was measured using an equilibrium system, i.e. the DGM in the water phase equilibrated with a stream of gas and the gas was thereafter analysed with respect to its mercury content. The DGM concentrations were calculated using the following equation, DGM = Hg eq / k H' where Hg eq is the equilibrated concentration of elemental mercury in the gas phase and k H' is the dimensionless Henry's law constant at desired temperature and salinity. During the expedition several features were observed. For example, enhanced DGM concentration was measured underneath the ice which may indicate that the sea ice acted as a barrier for evasion of mercury from the Arctic Ocean to the atmosphere. Furthermore, elevated DGM concentrations were observed in water that might have originated from river discharge. The gas-exchange of mercury between the ocean and the atmosphere was calculated in the open water and both deposition and evasion were observed. The measurements showed significantly enhanced DGM concentrations, compared to more southern latitudes. © 2008 Elsevier B.V. All rights reserved.
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- Andersson, Maria, 1980, et al.
(författare)
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Seasonal and daily variation of mercury evasion at coastal and off shore sites from the Mediterranean Sea
- 2007
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Ingår i: Marine Chemistry. - : Elsevier BV. - 0304-4203. ; 104:3-4, s. 214-226
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Tidskriftsartikel (refereegranskat)abstract
- Dissolved gaseous mercury (DGM) was measured continuously using two newly developed techniques and a manual technique. The continuous techniques were based on the equilibrium between the aqueous and gaseous phase (DGM = Hg-extr / H', Hg-extr is the measured mercury concentration in the gas phase, H' is the Henry's Law coefficient at the desired temperature). In order to calculate the annual mercury evasion from the Mediterranean Sea, diurnal and seasonal measurements of DGM, total gaseous mercury in air (TGM), water temperature and wind speed were performed. During August 2003, March-April 2004 and October-November 2004 measurements of these parameters were conducted on board the RV Urania. The continuous measurements of DGM showed a diurnal variation in concentration, at both coastal and off shore sites, with higher concentrations during daytime than nighttime. The concentration difference could be as large as 130 fM between day and night. The degree of saturation was calculated directly from the measurements, S = Hg-extr / TGM and was found to vary between the different seasons. The highest average degree of saturation (850%) and the largest variation in saturation (600-1150%) was observed during the summer. The spring showed the lowest variation (260-360%) and the lowest average degree of saturation (320%). The autumn also showed a large variation in saturation (500-1070%) but a lower average (740%) compared to the summer cruise. This might be explained by the temperature difference between the different seasons, since that parameter varied the most. The flux from the sea surface was calculated using the gas exchange model developed by Nightingale et al. [Nightingale, P.D., Malin, G., Law, C.S., Watson, A.J., Liss, P. S., Liddicoat, M.I., Boutin, J., Upstill-Goddard, R. C., 2000. In situ evaluation of air-sea gas exchange parameterization using novel conservative and volatile tracers. Global Biogeochemical Cycles, 14(l):373-387]. The evasion varied between the different seasons with the highest evasion during the autumn, 24.6 pmol m(-2) h(-1). The summer value was estimated to 22.3 pmol m(-2) h(-1) and the spring to 7.6 pmol m(-2) h(-1). Using this data the yearly evasion from the Mediterranean Sea surface was estimated to 77 tons. (C) 2006 Elsevier B.V. All rights reserved.
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- Andersson, Maria, 1980
(författare)
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Transport of Mercury Species in the Environment. Exchange between Oceanic Waters and the Atmosphere
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Mercury is an element present in the earth crust as well as a component in the atmosphere. During centuries mercury has been released by natural sources, e.g. volcanic eruptions, evasion from water surfaces and degassing from soil. However, during the industrial revolution the anthropogenic emissions of mercury increased drastically. Today, mercury is considered to be a global pollutant, affecting our environment and living species. Monitoring of some airborne mercury species has been carried out for several years and the understanding of the cycling of mercury has increased. However, the mercury species in the oceans are more challenging to investigate and the available data is limited. In this thesis measurement of dissolved gaseous mercury (DGM) in surface waters and calculations of gas-exchange between the oceanic surface and the atmosphere are presented. The investigations have been conducted at several locations in the northern hemisphere i.e. the Mediterranean Sea, the North Atlantic Ocean and the Arctic Ocean. These measurements contribute to increase the understanding of transport of volatile mercury, which is an important part of the overall assessment of the biogeochemical cycle of mercury. In order to perform gas-exchange estimations of volatile mercury, knowledge of the DGM concentration in water, total gaseous mercury (TGM) concentration in air, wind speed, water temperature and the Henry’s Law constant (kH’) are needed. TGM, wind speed and water temperature can be measured continuously and at high time resolution. However, for DGM measurements no such system has earlier been available, therefore a continuous system for high time resolution DGM measurements was developed during this work. The values for the kH’ were not in agreement in previously published investigations, thus a re-determination of the constant was needed and is presented in this thesis. Several expeditions were undertaken at the Mediterranean Sea to conduct measurements. Using data from these expeditions an annual evasion of 77 ton was estimated. Results from the expedition carried out in the North Atlantic and Arctic Oceans show that the concentrations of DGM are up to 10 times higher in the Arctic Ocean than in the North Atlantic Ocean. This finding suggests that mercury is accumulated in the Arctic Ocean. Furthermore, the measurements from the Arctic Ocean indicate that the sea ice may act as a barrier and prevent volatile mercury from evading from the sea surface.
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- Andersson Vogel, Maria, 1980-, et al.
(författare)
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Blurring the Lines Between Victimhood and Responsibilization? Sex as Behavioral Problems in Court Decisions on Compulsory Care of Young People
- 2024
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Ingår i: Feminist Criminology. - 1557-0851 .- 1557-086X.
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Tidskriftsartikel (refereegranskat)abstract
- Formal social control of girls has historically focused on disciplining their sexual behavior, and studies show this is still present. This article analyses how authorities describe and give meaning to young people’s sexual behavior when assessing their need of compulsory care. The results show that in the few cases when boys’ sexual behavior is highlighted, it concerns sexual delinquency. The assessments of girls’ sexual behavior largely regards situations where they are exposed to others’ sexual transgressions, risking to victim-blame girls. This is discussed in relation to gendered understandings of sexual behavior and supposed gaps in legislation.
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- Andersson Vogel, Maria, 1980-, et al.
(författare)
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Good idea, bad prerequisite, zero result - the meaning of context in implementing aftercare for young people in secure unit care
- 2014
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Ingår i: Journal of Children's Services. - 1746-6660 .- 2042-8677. ; 9:3, s. 248-260
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Tidskriftsartikel (refereegranskat)abstract
- Purpose– The purpose of this paper is twofold: first, to report results from a quasi-experimental study of outcomes of a leaving care project for youth placed in secure unit care and second, based on the (zero) results, to analyse and discuss the interplay between organisational boundaries, social work and the target group when implementing a project such as the one studied.Design/methodology/approach– The outcome study had a quasi-experimental design. The young people in the leaving care programme were compared with a matched reference group who did not get the special leaving care services. Data were collected (structured Adolescent Drug Abuse Diagnosis-interviews) when the young people entered secure units and on follow-up (registered crime and re-entry into care).Findings– The outcome study showed that the leaving care project had no effect on the young people's situation at follow-up regarding re-offending and re-entry into secure unit care. This is understood and discussed in relation to the poor implementation of the leaving care project along with an inbuilt conflict between state and local municipality that overshadowed the good intentions of the project.Research limitations/implications– The effect study has a quasi-experimental design, and hence differences between the project group and the comparison group at T1 cannot be fully precluded, although nothing is pointing in such a direction. The unclear content of the intervention makes it difficult to decode how the variation in the support given to the young people eventually impacted the results. The zero-results apply to group level, but that may not be valid for each and every one in the project.Practical implications– According to earlier research, a key person following young persons through different phases of the care trajectory may be of importance. Learning from the CoC project, one can conclude that such a key person should preferably take the role of advocate for the young person, and not be an administrator mainly concerned with coordinating other professionals. Further, when planning and financing is split between organisations, that split hinders efforts to actually mobilise support for young people leaving secure unit care.Originality/value– Few leaving care services are designed for youth with severe behavioural problems and hence, the research is scarce. This study contributes with important knowledge about leaving care interventions for the target group.
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- Andersson Vogel, Maria, 1980-
(författare)
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Särskilda ungdomshem och vårdkedjor : Om ungdomar, kön, klass och etnicitet
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis follows a group of youths placed in secure unit care who have participated in a chain-of-care project aiming to better plan their discharge and aftercare. The overall aim of the thesis is to link a detailed description of these young people with an analysis of the project they participated in, and to undertake one- and two-year follow-up studies. Analytic focus is on the significance of gender, class and ethnicity. The study is mainly based on structured interviews performed at the secure units upon entry into care, discharge and at a one-year follow up. Data have also been used from criminal records and interviews with project staff.When entering care, these youths exhibited extensive problems in both family conditions and own behaviour. The major problem in boys was criminality while girls reported poor mental health. Professionals judge youth of foreign background as more criminal than youth of Swedish background despite a lack of difference in self-reported data. Some difference is also noticeable regarding class.Analysis of the project shows that out-of-home care was the most frequent intervention after leaving secure unit care, while other interventions were difficult to uphold over time. Few girls received help with their mental health problems. At the one-year follow up, the youths reported an overall better situation, although extensive problems still remained. Above all, girls’ mental health problems remained as before. At the 2-year follow up the study group was compared with a control group in order to investigate effects of the project regarding criminality and recommitment to secure unit care. The comparison shows that the project had no effect. This is discussed in relation to poor organization and the difficulty of adjusting a project like this to the target group, along with the substantial part played by gender, class and ethnicity in how the youth are construed and treated.
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