The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study
Abstract In the southwest Pacific, a meandering jet‐stream in the upper troposphere is sometimes found at ~30° S during austral winters and is usually treated as a sub‐tropical jet (STJ) due to its low latitude. For two contrasting cases, we have conducted analyses from two perspectives to identify...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-04-01
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| Series: | Atmospheric Science Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/asl.1203 |
| _version_ | 1797221189990481920 |
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| author | Y. Yang T. Carey‐Smith R. Turner |
| author_facet | Y. Yang T. Carey‐Smith R. Turner |
| author_sort | Y. Yang |
| collection | DOAJ |
| description | Abstract In the southwest Pacific, a meandering jet‐stream in the upper troposphere is sometimes found at ~30° S during austral winters and is usually treated as a sub‐tropical jet (STJ) due to its low latitude. For two contrasting cases, we have conducted analyses from two perspectives to identify the STJ and PFJ: first, using previously published qualitative criteria to identify jet‐cores and second, investigating the jet‐stream axes of STJ and PFJ identified using 2‐PVU curves. The results showed that the chosen meandering jet‐stream case at ~30° S was a merged, and for a time, a superposed STJ and PFJ. Downstream of the jet‐streak, the PFJ split to the south and the STJ to the east. This is in significant contrast to the horizontally well‐separated jet‐stream case chosen in this study. Some processes likely contributing to the superposition of the STJ and PFJ were analyzed and discussed. The movement of PFJ that was closely associated with the movement of the low over the Tasman Sea and the convection in and near the tropical region may have played dominant roles. |
| first_indexed | 2024-04-24T13:01:29Z |
| format | Article |
| id | doaj.art-173ec72a37974e0caea5c21872df5bee |
| institution | Directory Open Access Journal |
| issn | 1530-261X |
| language | English |
| last_indexed | 2024-04-24T13:01:29Z |
| publishDate | 2024-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Atmospheric Science Letters |
| spelling | doaj.art-173ec72a37974e0caea5c21872df5bee2024-04-05T10:29:57ZengWileyAtmospheric Science Letters1530-261X2024-04-01254n/an/a10.1002/asl.1203The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case studyY. Yang0T. Carey‐Smith1R. Turner2National Institute of Water and Atmospheric Research Wellington New ZealandNational Institute of Water and Atmospheric Research Wellington New ZealandNational Institute of Water and Atmospheric Research Wellington New ZealandAbstract In the southwest Pacific, a meandering jet‐stream in the upper troposphere is sometimes found at ~30° S during austral winters and is usually treated as a sub‐tropical jet (STJ) due to its low latitude. For two contrasting cases, we have conducted analyses from two perspectives to identify the STJ and PFJ: first, using previously published qualitative criteria to identify jet‐cores and second, investigating the jet‐stream axes of STJ and PFJ identified using 2‐PVU curves. The results showed that the chosen meandering jet‐stream case at ~30° S was a merged, and for a time, a superposed STJ and PFJ. Downstream of the jet‐streak, the PFJ split to the south and the STJ to the east. This is in significant contrast to the horizontally well‐separated jet‐stream case chosen in this study. Some processes likely contributing to the superposition of the STJ and PFJ were analyzed and discussed. The movement of PFJ that was closely associated with the movement of the low over the Tasman Sea and the convection in and near the tropical region may have played dominant roles.https://doi.org/10.1002/asl.1203eddy momentum fluxjet‐corejet‐streakjet‐streampolar‐front jetsub‐tropical jet |
| spellingShingle | Y. Yang T. Carey‐Smith R. Turner The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study Atmospheric Science Letters eddy momentum flux jet‐core jet‐streak jet‐stream polar‐front jet sub‐tropical jet |
| title | The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study |
| title_full | The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study |
| title_fullStr | The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study |
| title_full_unstemmed | The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study |
| title_short | The merged and superposed sub‐tropical jet and polar‐front jet in the southwest Pacific: A case study |
| title_sort | merged and superposed sub tropical jet and polar front jet in the southwest pacific a case study |
| topic | eddy momentum flux jet‐core jet‐streak jet‐stream polar‐front jet sub‐tropical jet |
| url | https://doi.org/10.1002/asl.1203 |
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