Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter
Abstract Dynamical understandings of midlatitude transient eddy activity, especially its midwinter minimum over the North Pacific, are still limited, partly because conventional Eulerian eddy statistics are incapable of separating cyclonic and anticyclonic contributions. Here we evaluate the two con...
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| Format: | Article |
| Language: | English |
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Wiley
2024-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL106932 |
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| author | Satoru Okajima Hisashi Nakamura Yohai Kaspi |
| author_facet | Satoru Okajima Hisashi Nakamura Yohai Kaspi |
| author_sort | Satoru Okajima |
| collection | DOAJ |
| description | Abstract Dynamical understandings of midlatitude transient eddy activity, especially its midwinter minimum over the North Pacific, are still limited, partly because conventional Eulerian eddy statistics are incapable of separating cyclonic and anticyclonic contributions. Here we evaluate the two contributions separately based on local curvature of instantaneous flow fields to compare their seasonality between the North Pacific and North Atlantic storm‐tracks. The anticyclonic contribution is found crucial for the midwinter minimum of the North Pacific transient eddy activity. Eddy energetics reveals that the net efficiency of the anticyclonic contribution in replenishing total transient eddy energy over the North Pacific exhibits a pronounced midwinter minimum leading to net energy loss, while that of its cyclonic counterpart does not, in harmony with a precipitation peak around midwinter. This study suggests that more attention should be paid to anticyclones in studying midlatitude storm‐track dynamics. |
| format | Article |
| id | doaj-art-0c0fcd7db9124e799ea3c1737aa00439 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-0c0fcd7db9124e799ea3c1737aa004392025-08-20T02:11:09ZengWileyGeophysical Research Letters0094-82761944-80072024-01-01512n/an/a10.1029/2023GL106932Anticyclonic Suppression of the North Pacific Transient Eddy Activity in MidwinterSatoru Okajima0Hisashi Nakamura1Yohai Kaspi2Research Center for Advanced Science and Technology The University of Tokyo Tokyo JapanResearch Center for Advanced Science and Technology The University of Tokyo Tokyo JapanDepartment of Earth and Planetary Sciences Weizmann Institute of Science Rehovot IsraelAbstract Dynamical understandings of midlatitude transient eddy activity, especially its midwinter minimum over the North Pacific, are still limited, partly because conventional Eulerian eddy statistics are incapable of separating cyclonic and anticyclonic contributions. Here we evaluate the two contributions separately based on local curvature of instantaneous flow fields to compare their seasonality between the North Pacific and North Atlantic storm‐tracks. The anticyclonic contribution is found crucial for the midwinter minimum of the North Pacific transient eddy activity. Eddy energetics reveals that the net efficiency of the anticyclonic contribution in replenishing total transient eddy energy over the North Pacific exhibits a pronounced midwinter minimum leading to net energy loss, while that of its cyclonic counterpart does not, in harmony with a precipitation peak around midwinter. This study suggests that more attention should be paid to anticyclones in studying midlatitude storm‐track dynamics.https://doi.org/10.1029/2023GL106932storm trackenergeticsanticyclonemidwinter minimumcurvaturecyclone |
| spellingShingle | Satoru Okajima Hisashi Nakamura Yohai Kaspi Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter Geophysical Research Letters storm track energetics anticyclone midwinter minimum curvature cyclone |
| title | Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter |
| title_full | Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter |
| title_fullStr | Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter |
| title_full_unstemmed | Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter |
| title_short | Anticyclonic Suppression of the North Pacific Transient Eddy Activity in Midwinter |
| title_sort | anticyclonic suppression of the north pacific transient eddy activity in midwinter |
| topic | storm track energetics anticyclone midwinter minimum curvature cyclone |
| url | https://doi.org/10.1029/2023GL106932 |
| work_keys_str_mv | AT satoruokajima anticyclonicsuppressionofthenorthpacifictransienteddyactivityinmidwinter AT hisashinakamura anticyclonicsuppressionofthenorthpacifictransienteddyactivityinmidwinter AT yohaikaspi anticyclonicsuppressionofthenorthpacifictransienteddyactivityinmidwinter |