We investigate the use of atmospheric oxygen (O2) and carbon dioxide (CO2) measurements for the estimation of the fossil fuel component of atmospheric CO2 in the UK. Atmospheric potential oxygen (APO) - a tracer that combines O2 and CO2, minimizing the influence of terrestrial biosphere fluxes - is simulated at three sites in the UK, two of which make APO measurements. We present a set of model ex

Preconcentration of methane (CH4) from air is a critical sampling step in the measurement of singly and doubly substituted isotopologue ratios. We demonstrate the potential for isotope fractionation during preconcentration onto and elution from the common trapping material HayeSep-D and investigate its significance in laser spectroscopy measurements. By altering the trapping temperature for adsorp

We use the GEOS-Chem global 3-D model and two inverse methods (the maximum a posteriori and ensemble Kalman filter) to infer regional methane (CH4) emissions and the corresponding stable-carbon-isotope source signatures from 2004-2020 across the globe using in situ and satellite remote sensing data. We use the Siegel estimator to determine linear trends from the in situ data. Over our 17-year stud

We have employed a new approach to quantify the amount fraction of nitrous oxide in a synthetic air matrix gas used to prepare high-accuracy reference materials of the same component. Until now, this was the largest contributor to the measurement uncertainty of nitrous oxide in air reference materials at atmospheric amount fractions (∼330 nmol mol-1), as identified in a recent international compar

We present a method for estimating fossil fuel methane emissions using observations of methane and ethane, accounting for uncertainty in their emission ratio. The ethane:methane emission ratio is incorporated as a spatially and temporally variable parameter in a Bayesian model, with its own prior distribution and uncertainty. We find that using an emission ratio distribution mitigates bias from us

Atmospheric measurements can be used as a tool to evaluate national greenhouse gas inventories through inverse modelling. Using 8 years of continuous methane (CH4) concentration data, this work assesses the United Kingdom's (UK) CH4 emissions over the period 2013-2020. Using two different inversion methods, we find mean emissions of 2.10±0.09 and 2.12±0.26Tgyr-1 between 2013 and 2020, an overall t

Atmospheric methane (CH4) and its isotopic composition trends over the last decades are explained by various flux scenarios, from tropical wetland emission increases through to reductions in global hydroxyl (OH). In this study, we develop a modeling framework to assess the potential usefulness of clumped isotope measurements to distinguish between the main drivers of change in the CH4 burden. We m

Radon gas is the largest source of public exposure to naturally occurring radioactivity. However, radon is also a useful tracer for understanding atmospheric processes, assessing the accuracy of chemical transport models, and enabling integrated emissions estimates of greenhouse gases. A sound metrological system for low level atmospheric radon observations is therefore needed for the benefit of t

It is estimated that global anthropogenic carbon dioxide (CO2) emissions reduced by up to 12% at the start of 2020 compared to recent years due to the COVID-19 related downturn in economic activity. Despite the large decrease in CO2 emissions, no reduction in the trend in background atmospheric CO2 concentrations has been detected. So, how long would it take for sustained COVID-19 CO2 emission red

This study reports thermodynamic and kinetic data of Sb(III) adsorption from single metal solutions onto synthetic aqueous goethite (α-FeOOH). Batch equilibrium sorption experiments were carried out at 25 °C over a Sb:Fe molar range of 0.005-0.05 and using a goethite concentration of 0.44 g Fe/L. Experimental data were successfully modelled using Langmuir (R2 ≥ 0.891) and Freundlich (R2 ≥ 0.990) i

The modified sample-standard bracketing method (m-SSB) combines a sample-standard bracketing and an inter-element correction procedure to account for instrumental mass fractionation during multi-collector ICP-MS measurements. Precisions for Cu and Zn isotopes in plant and experimental granite leachate samples are in line with those obtained using other mass bias correction techniques. In addition,

Intra-islet crosstalk has become a focus area to fully understand the regulation of insulin secretion and impaired β-cell function in type 2 diabetes (T2D). Here, we put forward evidence for insulin-like growth factor binding protein 7 (IGFBP7) as a potential protein involved in autocrine and paracrine β-cell regulation. We showed presence of IGFBP7 in granules of both human α- and β-cells and mea

Politiska organisationer anställer ofta, och i allt högre utsträckning, utredare och andra kunskapsarbetare för att producera kunskap och politiska förslag, och den svenska fackliga centralorganisationen LO har sedan 1930-talet anställt nationalekonomer och andra samhällsvetare. Genom analys- och presentationsmetoder som liknar den akademiska samhällsvetenskapen, och genom interaktion med talesperPolitical organisations routinely, and increasingly, employ researchers to make knowledge claims and suggest political action. Swedish blue-collar trade union organisation LO has done so since the 1930s, employing economists and other social scientists drawing in part on methods of analysis and presentation similar to academic social science, and in part on interaction with spokespersons for trade

Many spatial audio applications, including active noise control, virtual reality, and the generation of individual sound zones, rely on an understanding of acoustic propagation. In room acoustics, which is the focus of this thesis,the sound field generated by a point source is typically modelled as a linear time-invariant system, described by its room impulse response (RIR). The RIR captures the r

En viktig del av utvecklingen av den fysiska butiken är nya koncept, både som ett sätt att spegla den digitala utvecklingen (med omnikanal som ambition) men också som ett sätt att spegla en förändrad värld där nya konsumentbehov etcetera spelar en viktig roll. Men klarar sig nya format om inte också sättet att utvärdera dem förändras? Den traditionella utvärderingen med försäljning som bas behöver

This research project aims to explore and theorize the role of the Market in a hyperviolence-endorsing consumer culture. How does the subaltern speak through “gangfluencers” in a Global North welfare society, and how do affective intensities of consumer desire enact the violent consumer subject herein?This research project aims to explore and theorize the role of the Market in a hyperviolence-endorsing consumer culture. How does the subaltern speak through “gangfluencers” in a Global North welfare society, and how do affective intensities of consumer desire enact the violent consumer subject herein?