A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes
Along the west coast of North America (NA), a majority of the precipitation for the entire year falls during winter as a result of approximately a dozen cyclones or atmospheric rivers. However, persistent upper-level ridges can prevent the occurrence of wintertime precipitation events and lead to ex...
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ftunivalbany:oai:scholarsarchive.library.albany.edu:legacy-etd-3954 2024-05-19T07:36:45+00:00 A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes Leicht, Tyler Christopher 2022-01-01T08:00:00Z application/pdf https://scholarsarchive.library.albany.edu/legacy-etd/2955 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3954/viewcontent/Leicht_hAQe5eeCZkn6kVUePJEa3h.pdf English eng Scholars Archive https://scholarsarchive.library.albany.edu/legacy-etd/2955 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3954/viewcontent/Leicht_hAQe5eeCZkn6kVUePJEa3h.pdf Legacy Theses & Dissertations (2009 - 2024) Atmospheric blocking Atmospheric rivers Dynamic Meteorology Subseasonal to seasonal variability Synoptic Meteorology Atmospheric circulation Water vapor transport Upper atmosphere Drought forecasting Atmospheric Sciences text 2022 ftunivalbany 2024-04-24T00:28:55Z Along the west coast of North America (NA), a majority of the precipitation for the entire year falls during winter as a result of approximately a dozen cyclones or atmospheric rivers. However, persistent upper-level ridges can prevent the occurrence of wintertime precipitation events and lead to extended drought, significant water shortages, and adverse economy-wide impacts for major population centers in California. An increased understanding of the dynamical and thermodynamical processes that govern upper-level ridge formation, persistence, and dissipation during the rainy season along western NA would allow decision makers to better manage water resources and motivates this thesis. Persistent upper-level ridges will be defined by positive 500-hPa height anomalies ≥1.0 standard deviation that last for longer than 7 days, constructed using NCEP-NCAR reanalysis from 1948–2017. This resulting climatology will be used to construct composite analyses based off four pre-defined domains to uncover dynamical and thermodynamical linkages between persistent ridge regimes in different domains. Statistical relationships with teleconnections and case study examination are included in this presentation to further explain the evolution of persistent ridges. Composite analysis of the persistent ridge lifecycle shows different dynamical processes are important for persistent ridges in each domain, but nearly all composites highlight important interactions with upstream cyclones throughout the ridge lifecycle. In the statistical relationships, it was found that the phase of the North Pacific jet stream had the most statistically-significant frequency anomalies up to 10 days prior to the start of a persistent ridge, while the Arctic Oscillation had a much weaker relationship for most of the persistent ridges. Finally, the case study further demonstrates some of the dynamical and thermodynamical processes found through the composite analysis, with the biggest emphasis on repeated cyclogenesis aiding in the maintenance of a ... Text Arctic 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 |
Atmospheric blocking Atmospheric rivers Dynamic Meteorology Subseasonal to seasonal variability Synoptic Meteorology Atmospheric circulation Water vapor transport Upper atmosphere Drought forecasting Atmospheric Sciences |
spellingShingle |
Atmospheric blocking Atmospheric rivers Dynamic Meteorology Subseasonal to seasonal variability Synoptic Meteorology Atmospheric circulation Water vapor transport Upper atmosphere Drought forecasting Atmospheric Sciences Leicht, Tyler Christopher A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
topic_facet |
Atmospheric blocking Atmospheric rivers Dynamic Meteorology Subseasonal to seasonal variability Synoptic Meteorology Atmospheric circulation Water vapor transport Upper atmosphere Drought forecasting Atmospheric Sciences |
description |
Along the west coast of North America (NA), a majority of the precipitation for the entire year falls during winter as a result of approximately a dozen cyclones or atmospheric rivers. However, persistent upper-level ridges can prevent the occurrence of wintertime precipitation events and lead to extended drought, significant water shortages, and adverse economy-wide impacts for major population centers in California. An increased understanding of the dynamical and thermodynamical processes that govern upper-level ridge formation, persistence, and dissipation during the rainy season along western NA would allow decision makers to better manage water resources and motivates this thesis. Persistent upper-level ridges will be defined by positive 500-hPa height anomalies ≥1.0 standard deviation that last for longer than 7 days, constructed using NCEP-NCAR reanalysis from 1948–2017. This resulting climatology will be used to construct composite analyses based off four pre-defined domains to uncover dynamical and thermodynamical linkages between persistent ridge regimes in different domains. Statistical relationships with teleconnections and case study examination are included in this presentation to further explain the evolution of persistent ridges. Composite analysis of the persistent ridge lifecycle shows different dynamical processes are important for persistent ridges in each domain, but nearly all composites highlight important interactions with upstream cyclones throughout the ridge lifecycle. In the statistical relationships, it was found that the phase of the North Pacific jet stream had the most statistically-significant frequency anomalies up to 10 days prior to the start of a persistent ridge, while the Arctic Oscillation had a much weaker relationship for most of the persistent ridges. Finally, the case study further demonstrates some of the dynamical and thermodynamical processes found through the composite analysis, with the biggest emphasis on repeated cyclogenesis aiding in the maintenance of a ... |
format |
Text |
author |
Leicht, Tyler Christopher |
author_facet |
Leicht, Tyler Christopher |
author_sort |
Leicht, Tyler Christopher |
title |
A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
title_short |
A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
title_full |
A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
title_fullStr |
A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
title_full_unstemmed |
A synoptic-dynamic analysis of the structure and evolution of persistent north Pacific wintertime ridge regimes |
title_sort |
synoptic-dynamic analysis of the structure and evolution of persistent north pacific wintertime ridge regimes |
publisher |
Scholars Archive |
publishDate |
2022 |
url |
https://scholarsarchive.library.albany.edu/legacy-etd/2955 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3954/viewcontent/Leicht_hAQe5eeCZkn6kVUePJEa3h.pdf |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Legacy Theses & Dissertations (2009 - 2024) |
op_relation |
https://scholarsarchive.library.albany.edu/legacy-etd/2955 https://scholarsarchive.library.albany.edu/context/legacy-etd/article/3954/viewcontent/Leicht_hAQe5eeCZkn6kVUePJEa3h.pdf |
_version_ |
1799475880306671616 |