Effects of Jet Break on Summer Precipitation in Central Asia
Abstract The intensity and position of the westerly jet influence precipitation in Central Asia, while the impact of its structural changes on precipitation remains underexplored. This study defines a Jet Break Index based on ERA5 reanalysis data to examine how jet break events affect summer precipi...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-07-01
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| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2025GL116349 |
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| _version_ | 1849245647357607936 |
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| author | Mingzhen Gu Jiali Luo Nanxuan Jiang Lei Wang Zhiting Wang Fuhai Luo Chongyang Zhang Xufan Xia Jiankai Zhang |
| author_facet | Mingzhen Gu Jiali Luo Nanxuan Jiang Lei Wang Zhiting Wang Fuhai Luo Chongyang Zhang Xufan Xia Jiankai Zhang |
| author_sort | Mingzhen Gu |
| collection | DOAJ |
| description | Abstract The intensity and position of the westerly jet influence precipitation in Central Asia, while the impact of its structural changes on precipitation remains underexplored. This study defines a Jet Break Index based on ERA5 reanalysis data to examine how jet break events affect summer precipitation in the region. Results show that the index, derived using relative vorticity at 200 hPa, effectively identifies jet break events. The convergence and southward strengthening of Rossby waves as they propagate into Central Asia lead to jet break and trigger tropopause folding events. As stratospheric air intrudes into the troposphere, the resulting disturbance induces ascending (descending) motion in the downstream (upstream) region and is accompanied by positive (negative) vertical moisture advection contributions, thereby enhancing (suppressing) precipitation accordingly. These findings highlight the significant impact of jet break on precipitation anomalies and its implications for forecasting over Central Asia. |
| format | Article |
| id | doaj-art-560049a2f4514ade9133d0a486d07e20 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-560049a2f4514ade9133d0a486d07e202025-08-20T03:58:44ZengWileyGeophysical Research Letters0094-82761944-80072025-07-015214n/an/a10.1029/2025GL116349Effects of Jet Break on Summer Precipitation in Central AsiaMingzhen Gu0Jiali Luo1Nanxuan Jiang2Lei Wang3Zhiting Wang4Fuhai Luo5Chongyang Zhang6Xufan Xia7Jiankai Zhang8College of Atmospheric Sciences Lanzhou University Lanzhou ChinaCollege of Atmospheric Sciences Lanzhou University Lanzhou ChinaClimate Change Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaDepartment of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences Fudan University Shanghai ChinaCollege of Atmospheric Sciences Lanzhou University Lanzhou ChinaSchool of Systems Science Beijing Normal University Beijing ChinaCollege of Atmospheric Sciences Lanzhou University Lanzhou ChinaCollege of Atmospheric Sciences Lanzhou University Lanzhou ChinaCollege of Atmospheric Sciences Lanzhou University Lanzhou ChinaAbstract The intensity and position of the westerly jet influence precipitation in Central Asia, while the impact of its structural changes on precipitation remains underexplored. This study defines a Jet Break Index based on ERA5 reanalysis data to examine how jet break events affect summer precipitation in the region. Results show that the index, derived using relative vorticity at 200 hPa, effectively identifies jet break events. The convergence and southward strengthening of Rossby waves as they propagate into Central Asia lead to jet break and trigger tropopause folding events. As stratospheric air intrudes into the troposphere, the resulting disturbance induces ascending (descending) motion in the downstream (upstream) region and is accompanied by positive (negative) vertical moisture advection contributions, thereby enhancing (suppressing) precipitation accordingly. These findings highlight the significant impact of jet break on precipitation anomalies and its implications for forecasting over Central Asia.https://doi.org/10.1029/2025GL116349westerly jetCentral AsiaprecipitationRossby wavestropopause folding |
| spellingShingle | Mingzhen Gu Jiali Luo Nanxuan Jiang Lei Wang Zhiting Wang Fuhai Luo Chongyang Zhang Xufan Xia Jiankai Zhang Effects of Jet Break on Summer Precipitation in Central Asia Geophysical Research Letters westerly jet Central Asia precipitation Rossby waves tropopause folding |
| title | Effects of Jet Break on Summer Precipitation in Central Asia |
| title_full | Effects of Jet Break on Summer Precipitation in Central Asia |
| title_fullStr | Effects of Jet Break on Summer Precipitation in Central Asia |
| title_full_unstemmed | Effects of Jet Break on Summer Precipitation in Central Asia |
| title_short | Effects of Jet Break on Summer Precipitation in Central Asia |
| title_sort | effects of jet break on summer precipitation in central asia |
| topic | westerly jet Central Asia precipitation Rossby waves tropopause folding |
| url | https://doi.org/10.1029/2025GL116349 |
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