Signatur:
AWI A4-20-93991
Beschreibung / Inhaltsverzeichnis:
Over the last decades, the Arctic regions of the earth have warmed at a rate 2–3 times faster than the global average– a phenomenon called Arctic Amplification. A complex, non-linear interplay of physical processes and unique pecularities in the Arctic climate system is responsible for this, but the relative role of individual processes remains to be debated. This thesis focuses on the climate change and related processes on Svalbard, an archipelago in the North Atlantic sector of the Arctic, which is shown to be a "hotspot" for the amplified recent warming during winter. In this highly dynamical region, both oceanic and atmospheric large-scale transports of heat and moisture interfere with spatially inhomogenous surface conditions, and the corresponding energy exchange strongly shapes the atmospheric boundary layer. In the first part, Pan-Svalbard gradients in the surface air temperature (SAT) and sea ice extent (SIE) in the fjords are quantified and characterized. This analysis is based on observational data from meteorological stations, operational sea ice charts, and hydrographic observations from the adjacent ocean, which cover the 1980–2016 period. [...]
Materialart:
Dissertationen
Seiten:
xv, 123 Seiten
,
Illustrationen, Diagramme
URL:
http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-445542
URL:
https://doi.org/10.25932/publishup-44554
URN:
urn:nbn:de:kobv:517-opus4-445542
DOI:
10.25932/publishup-44554
Sprache:
Englisch
Anmerkung:
Dissertation, Universität Potsdam, 2020
,
CONTENTS
1 Introduction
1.1 Context: A rapidly changing Arctic
1.1.1 Documentation of recent changes in the Arctic
1.1.2 Research relevance
1.1.3 Objective: Svalbard as a hotspot for climate change
1.2 Physical Background
1.2.1 Radiation and surface energy balance
1.2.2 Peculiarities of the Arctic climate system
1.2.3 Role of atmospheric circulation
1.3 The regional setup on Svalbard
2 data and methods
2.1 Data description
2.1.1 Era-Interim atmospheric reanalysis
2.1.2 Svalbard Station Meteorology
2.1.3 Sea Ice Extent
2.1.4 Ocean data products
2.1.5 FLEXTRA Trajectories
2.2 Statistical Methods
2.2.1 Trend estimation
2.2.2 Correlation
2.2.3 Coefficient of Determination
3 state of surface climate parameters: pan-svalbard differences
3.1 Motivation
3.2 Surface air temperature
3.2.1 Annual cycle
3.2.2 Annual temperature range
3.2.3 Long-term trends
3.3 Fjord Sea Ice coverage
3.3.1 Climatology
3.3.2 Sea ice cover trends
3.3.3 Regional classification across Svalbard
3.3.4 Drivers of regional differences
3.4 Discussion and Conclusion
3.5 Current state of climate projections for the Svalbard region
4 Air mass back trajectories
4.1 Methodology
4.2 Winter
4.2.1 Source Regions of Ny-Ålesund Air
4.2.2 Circulation changes
4.2.3 Quantification of Advective Warming
4.3 Summer
4.3.1 Source Regions of Ny-Ålesund Air
4.3.2 Circulation changes
4.3.3 Quantification of advective cooling
4.3.4 Observational Case Study: May/June 2017
4.4 Discussion and Conclusion
5 Changing drivers of the arctic near surface temperature budget
5.1 Winter
5.2 Summer
5.3 Summary
6 Summary and conclusion
A Details on calculations
A.1 SLP composite Index
A.2 Derivation of coefficient of determination
A.3 Temperature effect of changing source regions over time
B Supplementary figures
Bibliography
Standort:
AWI Lesesaal
Zweigbibliothek:
AWI Bibliothek
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