Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season
The southeastern United States (SE US) receives ample precipitation year-round. In the winter, precipitation primarily comes from synoptic-scale baroclinic systems and cold fronts. Meanwhile, precipitation in the summer over the SE US is primarily the result of convection. With this shift from the w...
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East Carolina University
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fteastcaroluni:oai:TheScholarship.intra.ecu.edu:10342/6958 2023-05-15T17:36:18+02:00 Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season Wells, Hannah C Rickenbach, Thomas M Geography, Planning, and Environment 2018-08-09T20:03:13Z application/pdf http://hdl.handle.net/10342/6958 en eng East Carolina University http://hdl.handle.net/10342/6958 Isolated precipitation feature North Atlantic subtropical high Convection (Meteorology)--Southern States Precipitation (Meteorology)--Southern States Master's Thesis text 2018 fteastcaroluni 2022-07-11T11:40:39Z The southeastern United States (SE US) receives ample precipitation year-round. In the winter, precipitation primarily comes from synoptic-scale baroclinic systems and cold fronts. Meanwhile, precipitation in the summer over the SE US is primarily the result of convection. With this shift from the winter to summertime precipitation regimes, spring is the transition period to the convective season, and this transition occurs rather abruptly. This shift can be described as a sudden increase in precipitation from isolated precipitation features (IPF) while precipitation from mesoscale precipitation features (MPF) stays relatively unchanged over the SE US. IPF is defined as small, short-lived, and spatially heterogeneous features while MPF is defined as larger, well-organized, and generally longer-lived precipitating features. To study the springtime transition to the convective season, the SE US was split into twenty-seven 2°x2° boxes. Precipitation data for March-August from the National Mosaic and Multi-Sensor Quantitative Precipitation Estimation (QPE) (NMQ) for the years 2009-2012 is used to determine onset using an objective method based on IPF precipitation in each of the twenty-seven boxes for each year and for the four-year average. Meteorological data from the North American Regional Reanalysis (NARR) is analyzed to determine potential dynamic and thermodynamic mechanisms that cause onset of the convective season in the SE US. Thermodynamic variables analyzed include convective available potential energy (CAPE), surface temperature, and specific humidity. Dynamic variables analyzed include 500 hPa geopotential height, mean sea level pressure (MSLP), and 850 hPa wind speed and direction. Daily composites of NARR are generated for May and June, while pentad average composites are generated for April-July for each year. Pentad averages of IPF will be created using the NMQ dataset to determine the pentad of onset. Three different sensitivity tests are also conducted to determine how sensitive onset is to the ... Master Thesis North Atlantic East Carolina University: The ScholarShip at ECU |
institution |
Open Polar |
collection |
East Carolina University: The ScholarShip at ECU |
op_collection_id |
fteastcaroluni |
language |
English |
topic |
Isolated precipitation feature North Atlantic subtropical high Convection (Meteorology)--Southern States Precipitation (Meteorology)--Southern States |
spellingShingle |
Isolated precipitation feature North Atlantic subtropical high Convection (Meteorology)--Southern States Precipitation (Meteorology)--Southern States Wells, Hannah C Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
topic_facet |
Isolated precipitation feature North Atlantic subtropical high Convection (Meteorology)--Southern States Precipitation (Meteorology)--Southern States |
description |
The southeastern United States (SE US) receives ample precipitation year-round. In the winter, precipitation primarily comes from synoptic-scale baroclinic systems and cold fronts. Meanwhile, precipitation in the summer over the SE US is primarily the result of convection. With this shift from the winter to summertime precipitation regimes, spring is the transition period to the convective season, and this transition occurs rather abruptly. This shift can be described as a sudden increase in precipitation from isolated precipitation features (IPF) while precipitation from mesoscale precipitation features (MPF) stays relatively unchanged over the SE US. IPF is defined as small, short-lived, and spatially heterogeneous features while MPF is defined as larger, well-organized, and generally longer-lived precipitating features. To study the springtime transition to the convective season, the SE US was split into twenty-seven 2°x2° boxes. Precipitation data for March-August from the National Mosaic and Multi-Sensor Quantitative Precipitation Estimation (QPE) (NMQ) for the years 2009-2012 is used to determine onset using an objective method based on IPF precipitation in each of the twenty-seven boxes for each year and for the four-year average. Meteorological data from the North American Regional Reanalysis (NARR) is analyzed to determine potential dynamic and thermodynamic mechanisms that cause onset of the convective season in the SE US. Thermodynamic variables analyzed include convective available potential energy (CAPE), surface temperature, and specific humidity. Dynamic variables analyzed include 500 hPa geopotential height, mean sea level pressure (MSLP), and 850 hPa wind speed and direction. Daily composites of NARR are generated for May and June, while pentad average composites are generated for April-July for each year. Pentad averages of IPF will be created using the NMQ dataset to determine the pentad of onset. Three different sensitivity tests are also conducted to determine how sensitive onset is to the ... |
author2 |
Rickenbach, Thomas M Geography, Planning, and Environment |
format |
Master Thesis |
author |
Wells, Hannah C |
author_facet |
Wells, Hannah C |
author_sort |
Wells, Hannah C |
title |
Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
title_short |
Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
title_full |
Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
title_fullStr |
Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
title_full_unstemmed |
Dynamic and Thermodynamic Mechanisms for the Onset of the Southeastern United States Convective Season |
title_sort |
dynamic and thermodynamic mechanisms for the onset of the southeastern united states convective season |
publisher |
East Carolina University |
publishDate |
2018 |
url |
http://hdl.handle.net/10342/6958 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/10342/6958 |
_version_ |
1766135740315467776 |