Examining the impact of stratospheric vortex variability on US surface temperature
Variability in high-latitude stratospheric flow, including major sudden stratospheric warming (SSW) or strong polar vortex events, can modulate tropospheric circulation and have meteorological implications on surface temperature and weather. The largest tropospheric impacts from Northern Hemisphere...
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ftunivalbany:oai:scholarsarchive.library.albany.edu:legacy-etd-3903 2024-05-19T07:45:24+00:00 Examining the impact of stratospheric vortex variability on US surface temperature Fernandez, Elena M 2022-08-01T07:00:00Z application/pdf https://scholarsarchive.library.albany.edu/legacy-etd/2904 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3903/viewcontent/Fernandez_MMM8JSQTq5usvJmymUpetv.pdf English eng Scholars Archive https://scholarsarchive.library.albany.edu/legacy-etd/2904 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3903/viewcontent/Fernandez_MMM8JSQTq5usvJmymUpetv.pdf Legacy Theses & Dissertations (2009 - 2024) Cold Air Outbreak Polar Vortex Stratosphere Sudden Stratospheric Warming Stratospheric circulation Earth temperature Atmospheric Sciences Meteorology text 2022 ftunivalbany 2024-04-24T00:28:55Z Variability in high-latitude stratospheric flow, including major sudden stratospheric warming (SSW) or strong polar vortex events, can modulate tropospheric circulation and have meteorological implications on surface temperature and weather. The largest tropospheric impacts from Northern Hemisphere stratospheric variability – and the regions of focus in the literature – are observed in the North Atlantic, Europe and Asia. Impacts on North America occur but have received less research attention. The goal of this thesis research is to identify and quantify the relationship between high-latitude stratospheric variability and North American wintertime temperature.Using the ERA-Interim and ERA-5 reanalysis for the period of 1999/2000–2018/19, this thesis first identifies stratospheric variability from the commonly used zonal-mean perspective, but also considers variability in the geometry of the stratospheric polar vortex. Then using the zonal-mean and geometry-based diagnostics of stratospheric variability, the statistical relationships in the climatological patterns and responses of tropospheric temperature to stratospheric variability in the continental U.S. (CONUS) are analyzed. Stratospheric variability is considered using several metrics, including the commonly implemented metric of 10-hPa zonal-mean wind at 60˚N and the non-zonal geometric properties of the stratospheric polar vortex. The geometric properties of the stratospheric vortex – or elliptical diagnostics – are calculated using a best-fit ellipse applied to specific contours of the 50 and 10-hPa geopotential height. These elliptical diagnostics include metrics for the stratospheric polar vortex length, width, area, ratio (length/width), and orientation angle with respect to 0˚W longitude. Each of the stratospheric metrics is correlated to winter tropospheric temperature in the CONUS using a Kendall-Tau (K-T) correlation test, and linear regression theilslopes underscore the trends in tropospheric temperature dependent on stratospheric ... Text North Atlantic University at Albany, State University of New York (SUNY): Scholars Archive |
institution |
Open Polar |
collection |
University at Albany, State University of New York (SUNY): Scholars Archive |
op_collection_id |
ftunivalbany |
language |
English |
topic |
Cold Air Outbreak Polar Vortex Stratosphere Sudden Stratospheric Warming Stratospheric circulation Earth temperature Atmospheric Sciences Meteorology |
spellingShingle |
Cold Air Outbreak Polar Vortex Stratosphere Sudden Stratospheric Warming Stratospheric circulation Earth temperature Atmospheric Sciences Meteorology Fernandez, Elena M Examining the impact of stratospheric vortex variability on US surface temperature |
topic_facet |
Cold Air Outbreak Polar Vortex Stratosphere Sudden Stratospheric Warming Stratospheric circulation Earth temperature Atmospheric Sciences Meteorology |
description |
Variability in high-latitude stratospheric flow, including major sudden stratospheric warming (SSW) or strong polar vortex events, can modulate tropospheric circulation and have meteorological implications on surface temperature and weather. The largest tropospheric impacts from Northern Hemisphere stratospheric variability – and the regions of focus in the literature – are observed in the North Atlantic, Europe and Asia. Impacts on North America occur but have received less research attention. The goal of this thesis research is to identify and quantify the relationship between high-latitude stratospheric variability and North American wintertime temperature.Using the ERA-Interim and ERA-5 reanalysis for the period of 1999/2000–2018/19, this thesis first identifies stratospheric variability from the commonly used zonal-mean perspective, but also considers variability in the geometry of the stratospheric polar vortex. Then using the zonal-mean and geometry-based diagnostics of stratospheric variability, the statistical relationships in the climatological patterns and responses of tropospheric temperature to stratospheric variability in the continental U.S. (CONUS) are analyzed. Stratospheric variability is considered using several metrics, including the commonly implemented metric of 10-hPa zonal-mean wind at 60˚N and the non-zonal geometric properties of the stratospheric polar vortex. The geometric properties of the stratospheric vortex – or elliptical diagnostics – are calculated using a best-fit ellipse applied to specific contours of the 50 and 10-hPa geopotential height. These elliptical diagnostics include metrics for the stratospheric polar vortex length, width, area, ratio (length/width), and orientation angle with respect to 0˚W longitude. Each of the stratospheric metrics is correlated to winter tropospheric temperature in the CONUS using a Kendall-Tau (K-T) correlation test, and linear regression theilslopes underscore the trends in tropospheric temperature dependent on stratospheric ... |
format |
Text |
author |
Fernandez, Elena M |
author_facet |
Fernandez, Elena M |
author_sort |
Fernandez, Elena M |
title |
Examining the impact of stratospheric vortex variability on US surface temperature |
title_short |
Examining the impact of stratospheric vortex variability on US surface temperature |
title_full |
Examining the impact of stratospheric vortex variability on US surface temperature |
title_fullStr |
Examining the impact of stratospheric vortex variability on US surface temperature |
title_full_unstemmed |
Examining the impact of stratospheric vortex variability on US surface temperature |
title_sort |
examining the impact of stratospheric vortex variability on us surface temperature |
publisher |
Scholars Archive |
publishDate |
2022 |
url |
https://scholarsarchive.library.albany.edu/legacy-etd/2904 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3903/viewcontent/Fernandez_MMM8JSQTq5usvJmymUpetv.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Legacy Theses & Dissertations (2009 - 2024) |
op_relation |
https://scholarsarchive.library.albany.edu/legacy-etd/2904 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3903/viewcontent/Fernandez_MMM8JSQTq5usvJmymUpetv.pdf |
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1799485445446303744 |