Search for dissertations about: "cosmogenic"
Showing result 1 - 5 of 23 swedish dissertations containing the word cosmogenic.
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1. Glacial history of Northeast Greenland: cosmogenic nuclide constraints on chronology and ice dynamics
Abstract : The aim of this thesis was to use cosmogenic exposure dating to investigating whether highly weathered landscapes in the Northeast Greenland fjord zone have developed during prolonged ice free conditions or have been preserved beneath cold-based ice. Previous work along the Northeast Greenland coast has presented two conflicting hypotheses for the extent of the Greenland Ice Sheet during the last glacial maximum (LGM). READ MORE
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2. Extreme solar particle storms and links to solar activity inferred from cosmogenic radionuclides in ice cores
Abstract : During solar storms, large amounts of solar energetic particles (SEP) are accelerated into the interplanetary medium and sometimes hit Earth. These events, known as SEP events, can have harmful impacts on our modern society by affecting spacecrafts and potentially astronauts in space. READ MORE
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3. Atmospheric Production and Transport of Cosmogenic 7Be and 10Be
Abstract : This thesis deals with the atmospheric distribution of the cosmogenic isotopes 7Be (half-life 53 days) and 10Be (half-life 1.51 million years) as well as the anthropogenic isotope 137Cs (half-life 30 years) in aerosols and precipitation. READ MORE
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4. Disentangling production and climate signals from high-resolution Beryllium records: implications for solar and geomagnetic reconstructions
Abstract : The sun is the most important energy source for the Earth’s climate system, however, influences of solar variations on climate are not fully understood. Studying past solar activity can improve our understanding of what role the sun plays in Earth’s climate. READ MORE
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5. Influence of solar activity and environment on 10Be in recent natural archives
Abstract : Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. READ MORE