Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States
Abstract This study analyzes the effect of the location of the North Atlantic Subtropical High (NASH) western ridge on the daily variability of precipitation organization in the southeastern United States (SE US). The western side of the NASH, also known as the NASH western ridge, plays an important...
Published in: | International Journal of Climatology |
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crwiley:10.1002/joc.6561 2024-09-15T18:22:54+00:00 Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States Nieto Ferreira, Rosana Rickenbach, Thomas M. National Science Foundation 2020 http://dx.doi.org/10.1002/joc.6561 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6561 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6561 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6561 https://rmets.onlinelibrary.wiley.com/doi/am-pdf/10.1002/joc.6561 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6561 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 40, issue 14, page 5987-6001 ISSN 0899-8418 1097-0088 journal-article 2020 crwiley https://doi.org/10.1002/joc.6561 2024-07-11T04:38:51Z Abstract This study analyzes the effect of the location of the North Atlantic Subtropical High (NASH) western ridge on the daily variability of precipitation organization in the southeastern United States (SE US). The western side of the NASH, also known as the NASH western ridge, plays an important role in the variability of summertime precipitation in this region. In this study, the mean summertime position of the NASH western ridge was determined and used to classify each summer day during 2009–2012 into one of four quadrants. Composites of synoptic‐scale circulation and precipitation from mesoscale and isolated precipitation features (MPF and IPF) were calculated for each NASH western ridge quadrant. MPF contributed most (about 65%) of the total summertime precipitation and accounted for most of the differences between the four NASH quadrants. Domain‐averaged precipitation was highest (lowest) during NASH‐SW (NASH‐NW) when IPF (MPF) precipitation was strongest (weakest). The regionality of MPF precipitation maxima was generally associated with the location of low‐level jets and upper‐level troughs. For instance, positive MPF anomalies occurred across the SE US during NASH‐SW when the Great Plains low‐level jet turned eastward bringing moisture to fuel convection in the SE US. In contrast, IPF rain was distributed more uniformly across the SE US. Finally, this study revealed a dipole of precipitation that is controlled by the position of the NASH western ridge and its associated low‐level jets. In one extreme of the dipole NASH‐SE, periods are associated with enhanced MPF precipitation along the coast and offshore for days at a time, and suppressed MPF precipitation inland. The opposite pattern occurs during NASH‐NW when MPF precipitation is enhanced inland and suppressed along the coast and offshore. Article in Journal/Newspaper North Atlantic Wiley Online Library International Journal of Climatology 40 14 5987 6001 |
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Wiley Online Library |
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English |
description |
Abstract This study analyzes the effect of the location of the North Atlantic Subtropical High (NASH) western ridge on the daily variability of precipitation organization in the southeastern United States (SE US). The western side of the NASH, also known as the NASH western ridge, plays an important role in the variability of summertime precipitation in this region. In this study, the mean summertime position of the NASH western ridge was determined and used to classify each summer day during 2009–2012 into one of four quadrants. Composites of synoptic‐scale circulation and precipitation from mesoscale and isolated precipitation features (MPF and IPF) were calculated for each NASH western ridge quadrant. MPF contributed most (about 65%) of the total summertime precipitation and accounted for most of the differences between the four NASH quadrants. Domain‐averaged precipitation was highest (lowest) during NASH‐SW (NASH‐NW) when IPF (MPF) precipitation was strongest (weakest). The regionality of MPF precipitation maxima was generally associated with the location of low‐level jets and upper‐level troughs. For instance, positive MPF anomalies occurred across the SE US during NASH‐SW when the Great Plains low‐level jet turned eastward bringing moisture to fuel convection in the SE US. In contrast, IPF rain was distributed more uniformly across the SE US. Finally, this study revealed a dipole of precipitation that is controlled by the position of the NASH western ridge and its associated low‐level jets. In one extreme of the dipole NASH‐SE, periods are associated with enhanced MPF precipitation along the coast and offshore for days at a time, and suppressed MPF precipitation inland. The opposite pattern occurs during NASH‐NW when MPF precipitation is enhanced inland and suppressed along the coast and offshore. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Nieto Ferreira, Rosana Rickenbach, Thomas M. |
spellingShingle |
Nieto Ferreira, Rosana Rickenbach, Thomas M. Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
author_facet |
Nieto Ferreira, Rosana Rickenbach, Thomas M. |
author_sort |
Nieto Ferreira, Rosana |
title |
Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
title_short |
Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
title_full |
Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
title_fullStr |
Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
title_full_unstemmed |
Effects of the North Atlantic Subtropical High on summertime precipitation organization in the southeast United States |
title_sort |
effects of the north atlantic subtropical high on summertime precipitation organization in the southeast united states |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/joc.6561 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6561 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6561 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6561 https://rmets.onlinelibrary.wiley.com/doi/am-pdf/10.1002/joc.6561 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6561 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
International Journal of Climatology volume 40, issue 14, page 5987-6001 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.6561 |
container_title |
International Journal of Climatology |
container_volume |
40 |
container_issue |
14 |
container_start_page |
5987 |
op_container_end_page |
6001 |
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1810462940807036928 |