Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland
Land-terminating areas of the Greenland ice sheet have experienced significant mass loss over the last two decades, and a feedback between surficial meltwater production, resultant basal lubrication and ice-sheet flow velocity during the summer ablation season has been suggested as an explanation. M...
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Scott Polar Research Institute, University of Cambridge
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ftunivcam:oai:www.repository.cam.ac.uk:1810/275087 2023-07-30T04:03:49+02:00 Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland Fuhrmann, Jonathan 2012-09-25 application/pdf https://doi.org/10.17863/CAM.22263 https://www.repository.cam.ac.uk/handle/1810/275087 en eng Scott Polar Research Institute, University of Cambridge Scott Polar Research Institute University of Cambridge doi:10.17863/CAM.22263 https://www.repository.cam.ac.uk/handle/1810/275087 All Rights Reserved https://www.rioxx.net/licenses/all-rights-reserved/ Thesis Masters Master of Philosophy (MPhil) 2012 ftunivcam https://doi.org/10.17863/CAM.22263 2023-07-10T22:02:27Z Land-terminating areas of the Greenland ice sheet have experienced significant mass loss over the last two decades, and a feedback between surficial meltwater production, resultant basal lubrication and ice-sheet flow velocity during the summer ablation season has been suggested as an explanation. Meteorological conditions have long been known to be an important driver of surface melt, and the seasonal acceleration pattern observed in Greenland is overlaid by shorter trends as well as diurnal fluctuations and even shorter one-off discharge and acceleration peaks. This project aims to investigate the relationship between net shortwave radiation, air temperature and proglacial discharge using wavelet analysis in order to establish the variability of discharge on short (<1-3 days) timescales and how this is driven by meteorological factors on similar (<1-4 days) timescales. Wavelets produce a high-resolution breakdown of the time series in the frequency domain, allowing for a study which is continuous in three dimensions: time, frequency and power of variability. Both univariate and multivariate analyses are performed, providing an improvement over conventional time-series analysis which requires data to be split into arbitrary sections if these are to be analysed separately. Diurnal fluctuations are found in each of the time series analysed, although their magnitude and the duration and consistency of their presence varies both between series and years. The relationships between air temperature and discharge and net shortwave radiation and discharge are found to differ. Air temperature covaries with discharge on shorter timescales (up to 1 day) while net radiation exhibits stronger coherence with discharge on longer timesclaes (3-4 days). Master Thesis Greenland Ice Sheet Apollo - University of Cambridge Repository Greenland |
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Open Polar |
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Apollo - University of Cambridge Repository |
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ftunivcam |
language |
English |
description |
Land-terminating areas of the Greenland ice sheet have experienced significant mass loss over the last two decades, and a feedback between surficial meltwater production, resultant basal lubrication and ice-sheet flow velocity during the summer ablation season has been suggested as an explanation. Meteorological conditions have long been known to be an important driver of surface melt, and the seasonal acceleration pattern observed in Greenland is overlaid by shorter trends as well as diurnal fluctuations and even shorter one-off discharge and acceleration peaks. This project aims to investigate the relationship between net shortwave radiation, air temperature and proglacial discharge using wavelet analysis in order to establish the variability of discharge on short (<1-3 days) timescales and how this is driven by meteorological factors on similar (<1-4 days) timescales. Wavelets produce a high-resolution breakdown of the time series in the frequency domain, allowing for a study which is continuous in three dimensions: time, frequency and power of variability. Both univariate and multivariate analyses are performed, providing an improvement over conventional time-series analysis which requires data to be split into arbitrary sections if these are to be analysed separately. Diurnal fluctuations are found in each of the time series analysed, although their magnitude and the duration and consistency of their presence varies both between series and years. The relationships between air temperature and discharge and net shortwave radiation and discharge are found to differ. Air temperature covaries with discharge on shorter timescales (up to 1 day) while net radiation exhibits stronger coherence with discharge on longer timesclaes (3-4 days). |
format |
Master Thesis |
author |
Fuhrmann, Jonathan |
spellingShingle |
Fuhrmann, Jonathan Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
author_facet |
Fuhrmann, Jonathan |
author_sort |
Fuhrmann, Jonathan |
title |
Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
title_short |
Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
title_full |
Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
title_fullStr |
Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
title_full_unstemmed |
Application of Wavelet Analysis for Examining Climate and Meltwater Runoff in the Paakitsoq Region, West Greenland |
title_sort |
application of wavelet analysis for examining climate and meltwater runoff in the paakitsoq region, west greenland |
publisher |
Scott Polar Research Institute, University of Cambridge |
publishDate |
2012 |
url |
https://doi.org/10.17863/CAM.22263 https://www.repository.cam.ac.uk/handle/1810/275087 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
doi:10.17863/CAM.22263 https://www.repository.cam.ac.uk/handle/1810/275087 |
op_rights |
All Rights Reserved https://www.rioxx.net/licenses/all-rights-reserved/ |
op_doi |
https://doi.org/10.17863/CAM.22263 |
_version_ |
1772814922855481344 |