The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 33(10), (2020): 4109-4120, doi:10.1175/JCLI-D-19-0294.1. This stu...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25866 2023-05-15T17:36:05+02:00 The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet Parfitt, Rhys Kwon, Young-Oh 2020-04-13 https://hdl.handle.net/1912/25866 unknown American Meteorological Society https://doi.org/10.1175/JCLI-D-19-0294.1 Parfitt, R., & Kwon, Y. (2020). The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet. Journal of Climate, 33(10), 4109-4120. https://hdl.handle.net/1912/25866 doi:10.1175/JCLI-D-19-0294.1 Parfitt, R., & Kwon, Y. (2020). The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet. Journal of Climate, 33(10), 4109-4120. doi:10.1175/JCLI-D-19-0294.1 Atmosphere-ocean interaction Article 2020 ftwhoas https://doi.org/10.1175/JCLI-D-19-0294.1 2022-05-28T23:03:41Z Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 33(10), (2020): 4109-4120, doi:10.1175/JCLI-D-19-0294.1. This study suggests that the Gulf Stream influence on the wintertime North Atlantic troposphere is most pronounced when the eddy-driven jet (EDJ) is farthest south and better collocated with the Gulf Stream. Using the reanalysis dataset NCEP-CFSR for December–February 1979–2009, the daily EDJ latitude is separated into three regimes (northern, central, and southern). It is found that the average trajectory of atmospheric fronts covaries with EDJ latitude. In the southern EDJ regime (~19% of the time), the frequency of near-surface atmospheric fronts that pass across the Gulf Stream is maximized. Analysis suggests that this leads to significant strengthening in near-surface atmospheric frontal convergence resulting from strong air–sea sensible heat flux gradients (due to strong temperature gradients in the atmosphere and ocean). In recent studies, it was shown that the pronounced band of time-mean near-surface wind convergence across the Gulf Stream is set by atmospheric fronts. Here, it is shown that an even smaller subset of atmospheric fronts—those associated with a southern EDJ—primarily sets the time mean, due to enhanced Gulf Stream air–sea interaction. Furthermore, statistically significant anomalies in vertical velocity extending well above the boundary layer are identified in association with changes in EDJ latitude. These anomalies are particularly strong for a southern EDJ and are spatially consistent with increases in near-surface atmospheric frontal convergence over the Gulf Stream. These results imply that much of the Gulf Stream influence on the time-mean atmosphere is modulated on synoptic time scales, and enhanced when the EDJ is farthest south. For part of this study, R. P. was funded by the Weston ... Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Climate 33 10 4109 4120 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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Atmosphere-ocean interaction |
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Atmosphere-ocean interaction Parfitt, Rhys Kwon, Young-Oh The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
topic_facet |
Atmosphere-ocean interaction |
description |
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 33(10), (2020): 4109-4120, doi:10.1175/JCLI-D-19-0294.1. This study suggests that the Gulf Stream influence on the wintertime North Atlantic troposphere is most pronounced when the eddy-driven jet (EDJ) is farthest south and better collocated with the Gulf Stream. Using the reanalysis dataset NCEP-CFSR for December–February 1979–2009, the daily EDJ latitude is separated into three regimes (northern, central, and southern). It is found that the average trajectory of atmospheric fronts covaries with EDJ latitude. In the southern EDJ regime (~19% of the time), the frequency of near-surface atmospheric fronts that pass across the Gulf Stream is maximized. Analysis suggests that this leads to significant strengthening in near-surface atmospheric frontal convergence resulting from strong air–sea sensible heat flux gradients (due to strong temperature gradients in the atmosphere and ocean). In recent studies, it was shown that the pronounced band of time-mean near-surface wind convergence across the Gulf Stream is set by atmospheric fronts. Here, it is shown that an even smaller subset of atmospheric fronts—those associated with a southern EDJ—primarily sets the time mean, due to enhanced Gulf Stream air–sea interaction. Furthermore, statistically significant anomalies in vertical velocity extending well above the boundary layer are identified in association with changes in EDJ latitude. These anomalies are particularly strong for a southern EDJ and are spatially consistent with increases in near-surface atmospheric frontal convergence over the Gulf Stream. These results imply that much of the Gulf Stream influence on the time-mean atmosphere is modulated on synoptic time scales, and enhanced when the EDJ is farthest south. For part of this study, R. P. was funded by the Weston ... |
format |
Article in Journal/Newspaper |
author |
Parfitt, Rhys Kwon, Young-Oh |
author_facet |
Parfitt, Rhys Kwon, Young-Oh |
author_sort |
Parfitt, Rhys |
title |
The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
title_short |
The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
title_full |
The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
title_fullStr |
The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
title_full_unstemmed |
The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet |
title_sort |
modulation of gulf stream influence on the troposphere by the eddy-driven jet |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/25866 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Parfitt, R., & Kwon, Y. (2020). The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet. Journal of Climate, 33(10), 4109-4120. doi:10.1175/JCLI-D-19-0294.1 |
op_relation |
https://doi.org/10.1175/JCLI-D-19-0294.1 Parfitt, R., & Kwon, Y. (2020). The modulation of Gulf Stream influence on the troposphere by the eddy-driven jet. Journal of Climate, 33(10), 4109-4120. https://hdl.handle.net/1912/25866 doi:10.1175/JCLI-D-19-0294.1 |
op_doi |
https://doi.org/10.1175/JCLI-D-19-0294.1 |
container_title |
Journal of Climate |
container_volume |
33 |
container_issue |
10 |
container_start_page |
4109 |
op_container_end_page |
4120 |
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1766135450668367872 |