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- Almstedt Jansson, Malin, 1969-, et al.
(författare)
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Bibliometri för uppföljning och utvärdering : Högskolan i Gävle 2010-2016 (Version 2.1)
- 2016
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Rapport (populärvet., debatt m.m.)abstract
- I samband med arbetet att utforma de nya kunskapsmiljöerna vid Högskolan i Gävle fick biblioteket i uppdrag att ta fram statistik och bibliometriska mått för publiceringen vid Högskolan. Syftet med uppdraget var att ta fram data som grund för framtida utvärderingar och uppföljningar av verksamheten utifrån dessa kunskapsmiljöer.Följande rapport innehåller statistik avseende publiceringen vid Högskolan i Gävle, citeringsanalyser samt analys av samförfattande. Statistiken presenteras för hela Högskolan, för respektive kunskapsmiljöer samt för forskningsämnet biologi.
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- Amin, Hadi, et al.
(författare)
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Evaluation of the Closure of Global Mean Sea Level Rise Budget over January 2005 to August 2016
- 2019
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Konferensbidrag (populärvet., debatt m.m.)abstract
- Sea level changes over time because of water mass exchange among the oceans and continents, ice sheets, and atmosphere. It fluctuates also due to variations of seawater salinity and temperature known as the steric contributor. GRACE-based Stokes coefficients provide a valuable source of information, about the water mass exchange as the main contributor to the Earth’s gravity field changes, within decadal scales. Moreover, measuring seawater temperature and salinity at different layers of ocean depth, Argo floats help to model the steric component of Global Mean Sea Level. In this study, we evaluate the Global Mean Sea Level (GMSL) budget closure using satellite altimetry, GRACE, and Argo products. Hereof, considering the most recent released GRACE monthly products (RL06), we examine an iterative remove-restore method to minimize the effect of artifact leaked large signal from ice sheets and land hydrology. In addition, the effect of errors and biases in geophysical model corrections, such as GIA, on the GMSL budget closure is estimated. Moreover, we quantify the influence of spatial and decorrelation filtering of GRACE data on the GMSL budget closure. In terms of the monthly fluctuations of sea level, our results confirm that closing the GMSL budget is highly dependent on the choice of the spatial averaging filter. In addition, comparing the trends and variations for both the global mean sea level time series and those estimated for mass and steric components, we find that spatial averaging functions play a significant role in the sea level budget closure.
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- Astner, Linda, et al.
(författare)
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Utilizing waste to create new port land
- 2018
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Ingår i: Port Technology. ; 77:Spring, s. 118-119
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- This paper presents the most recent port expansion and the major dredging and land creation project that has been undertaken in the Port of Gävle since 2007. This project has seen the deepening and widening of the fairway to accommodate larger vessels, as well as the construction of a new cargo terminal area due to open in late 2019. This land creation work has been undertaken using contaminated sediments dredged from deepening the shipping channel.
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- Bagherbandi, Mohammad, Professor, et al.
(författare)
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Studying permafrost using GRACE and in situ data in the northern high-latitudes regions
- 2019
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Konferensbidrag (populärvet., debatt m.m.)abstract
- There is an exceptional opportunity of achieving simultaneous and complementary data from a multitude of geoscience and environmental near-earth orbiting artificial satellites to study phenomena related to the climate change e.g. sea level change, ice melting, soil moisture variation, temperature changes, and earth surface deformations. In this study, we focus on permafrost thawing and its associated gravity change, and organic material changes using GRACE data and other satellite- and ground-based observations. The estimation of permafrost changes requires combining information from various sources, particularly using the gravity field change, surface temperature change, and GIA. The most significant factor for careful monitoring of the permafrost thawing is the fact that this process could be responsible for releasing an additional enormous amount of greenhouse gases emitted to the atmosphere, most importantly to mention Carbone dioxide and Methane that are currently stored in the frozen ground. The results of a preliminary numerical analysis reveal a possible existence of a high correlation between the secular trends of greenhouse gases, temperature and equivalent water thickness in the selected regions. Furthermore, according to our estimates based on processing the GRACE data, the groundwater storage attributed to the due to permafrost thawing increased at the annual rates of 3.4, 3.8, 4.4 and 4.0 cm, in Siberia, northern Alaska, and Canada. Despite a rather preliminary character of our results, these findings indicate that the methodology developed and applied in this study should be improved by incorporating the in situ permafrost measurements.
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- Bagherbandi, Mohammad, Professor, et al.
(författare)
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Towards a world vertical datum defined by the geoid potential and Earth’s ellipsoidal parameters
- 2018
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Konferensbidrag (populärvet., debatt m.m.)abstract
- Sustainable development and digitalization need reliable data. Geospatial data becomes a more and more important tool in society for many kinds of research of immediate use, but also for future planning and enterprise. Harmonization of geodata is very important for data producers and organizations, e.g. for mapping agencies. Establishing a uniform horizontal/vertical reference system is a basic prerequisite for combining data from different sources, and for allowing cross-border presentations and analyzes. If we do not use the same reference for positioning, it is not certain that one can compose reliable geodata from different organizations.The overall aim of this study is to provide a theoretical and practical solution to unifying height systems in order to overcome systematic datum inconsistencies in height data and digital terrain models. The study deals with a variety of issues in physical geodesy such as Earth’s gravity field, sea level rise, sea surface topography and GNSS data. The advent of satellite altimetry in the 1970s provided a tool for the realization of a global vertical datum as being the equipotential surface of the Earth’s gravity field that minimizes the sea-surface topography (SST) all over the oceans in a least-squares sense. This leads to a direct determination of the geoid potential (W0) from satellite altimetry and an Earth Gravitational Model (EGM). In contrast, here we will first determine the Mean Earth Ellipsoid parameters and from these follows W0. This means that once the size of the axes of the globally best-fitting ellipsoid is determined, W0 follows. A major problem with this method is that satellite altimetry is only successful over the oceans, but the method requires global data. This problem is solved by employing satellite altimetry and the EGM in a practical combination.
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