Geophysical Institute: Nye registreringer
Viser treff 21-40 av 858
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Present Temperature, Precipitation, and Rain‐on‐Snow Climate in Svalbard
(Journal article; Peer reviewed, 2020)The Svalbard Archipelago has undergone rapid warming in the recent decades leading to warmer and wetter winter conditions. This study relates the present (2013–2018) 2 m temperature, precipitation, and rain-on-snow (ROS) ... -
Meteorological observations in tall masts for the mapping of atmospheric flow in Norwegian fjords
(Journal article; Peer reviewed, 2020)Since 2014, 11 tall meteorological masts have been erected in coastal areas of mid-Norway in order to provide observational data for a detailed description of the wind conditions at several potential fjord crossing sites. ... -
An evaluation of surface meteorology and fluxes over the Iceland and Greenland Seas in ERA5 reanalysis: The impact of sea ice distribution
(Journal article; Peer reviewed, 2021)The Iceland and Greenland Seas are a crucial region for the climate system, being the headwaters of the lower limb of the Atlantic Meridional Overturning Circulation. Investigating the atmosphere–ocean–ice processes in ... -
A Last Glacial Maximum forcing dataset for ocean modelling
(Journal article; Peer reviewed, 2020)Model simulations of the Last Glacial Maximum (LGM; ∼ 21 000 years before present) can aid the interpretation of proxy records, can help to gain an improved mechanistic understanding of the LGM climate system, and are ... -
The impact of assimilating data from a remotely piloted aircraft on simulations of weak-wind orographic flow
(Journal article; Peer reviewed, 2014)Orographic winds near a 914 m high mountain in Southwest-Iceland are explored using unique observations made aloft with a small remotely piloted aircraft, as well as with traditional observations and high-resolution ... -
Evaluating the leeway coefficient of ocean drifters using operational marine environmental prediction systems
(Journal article; Peer reviewed, 2020)The water following characteristics of six different drifter types are investigated using two different operational marine environmental prediction systems: one produced by Environment and Climate Change Canada (ECCC) and ... -
A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland
(Journal article; Peer reviewed, 2020)Extending oceanographic data beyond the instrumental period is highly needed to better characterize and understand multi-decadal to centennial natural ocean variability. Here, a stable isotope record at unprecedented ... -
Supercooled Southern Ocean Waters
(Journal article; Peer reviewed, 2020)In cold polar waters, temperatures sometimes drop below the freezing point, a process referred to as supercooling. However, observational challenges in polar regions limit our understanding of the spatial and temporal ... -
Comparison of wind speed and wave height trends from twentieth-century models and satellite altimeters
(Journal article; Peer reviewed, 2020)The trends in marine 10-m wind speed U10 and significant wave height Hs found in two century-long reanalyses are compared against a model-only integration. Reanalyses show spurious trends due to the assimilation of an ... -
Sensitivity analysis in key parameters related to wind power production
(Master thesis, 2021-06-01) -
A 4.5 Year‐Long Record of Svalbard Water Vapor Isotopic Composition Documents Winter Air Mass Origin
(Journal article; Peer reviewed, 2020)From May 2014 to September 2018, a laser spectrometer analyzer provided a 4.5 years continuous record of water vapor isotopic composition at Ny-Ålesund (8 m above sea level, a.s.l.), Svalbard. It corresponds to the longest ... -
Control of Doubly Fed Asynchronous Generators for Wind Power Application
(Master thesis, 2021-06-01)This thesis researches and develops a Doubly Fed Induction Generator (DFIG) model suitable for a university lab environment. DFIGs have attracted significant amount of research, as it is one of the leading generator systems ... -
Bidirectional DC-DC Converter for Supercapacitor as DC-bus Stabilization Element
(Master thesis, 2021-06-01)The demand for renewable energy from wind and solar is increasing. These energy sources are intermittent and unpredictable to a degree and require a stable but fast responding DCgrid. This is achieved by extending the ... -
Bidirectional DC-DC Converter For Charging Batteries of Electric Vehicles
(Master thesis, 2021-06-01)The popularity of electric vehicles has seen significant growth in the latest years. More electric vehicles are connected to the grid, and the load is increased consequently. The electric vehicle battery can be employed ... -
Numerical Investigation of a Radially Cooled Turbine Guide Vane Using Air and Steam as a Cooling Medium
(Master thesis, 2021-06-01)Gas turbine performance is closely linked to the turbine inlet temperature, which in turn is limited by the turbine guide vanes ability to withstand the massive thermal loads. To improve the efficiency in modern high-temperature ... -
Evaluering av potensiale for hybride fremdriftsløsninger i fritidsbåter
(Master thesis, 2021-06-01)Evaluering av hybriddrift for fritidsbåter av typen snekke og sjark med fartspotensiale 0 til 9 knop. Bruk av dataverktøy som Ricardo IGNITE og Excel for å se på effektbehov, forbruk og rekkevidde ved hybriddrift -
Snowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Events
(Journal article; Peer reviewed, 2020)Understanding climate proxy records that preserve physical characteristics of past climate is a prerequisite to reconstruct long-term climatic conditions. Water stable isotope ratios (δ18O) constitute a widely used proxy ... -
On the Influence of Sea Surface Temperature distributions on the Development of Extratropical Cyclones
(Journal article; Peer reviewed, 2021)The sea surface temperature (SST) distribution can modulate the development of extratropical cyclones through sensible and latent heat fluxes. However, the direct and indirect effects of these surface fluxes, and thus the ... -
The Role of the Stratosphere in Subseasonal to Seasonal Prediction: 2. Predictability Arising From Stratosphere-Troposphere Coupling
(Journal article; Peer reviewed, 2020)The stratosphere can have a significant impact on winter surface weather on subseasonal to seasonal (S2S) timescales. This study evaluates the ability of current operational S2S prediction systems to capture two important ... -
The ice front as a topographic barrier for ocean heat transport
(Doctoral thesis, 2021-06-28)Antarctic ice shelves are the link between the Southern Ocean and the Antarctic Ice Sheet. The floating ice shelves restrain the seaward flow of the grounded ice, which is balanced by iceberg calving and ocean-induced basal ...