Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China
Abstract Northeast China (NEC) is one of the major crop producing regions in China, which is severely affected by persistently extreme temperatures during summer. Previous works focused on understanding the intensity of extreme temperatures, yet neglecting its duration and timing. Considering the cr...
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| Format: | Article |
| Language: | English |
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Wiley
2025-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL116758 |
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| author | Jianying Li Ke Xu Yang Chen Jiangyu Mao Panmao Zhai Yuhan Yan |
| author_facet | Jianying Li Ke Xu Yang Chen Jiangyu Mao Panmao Zhai Yuhan Yan |
| author_sort | Jianying Li |
| collection | DOAJ |
| description | Abstract Northeast China (NEC) is one of the major crop producing regions in China, which is severely affected by persistently extreme temperatures during summer. Previous works focused on understanding the intensity of extreme temperatures, yet neglecting its duration and timing. Considering the critical role of 25–60‐day intraseasonal variability (ISV) in inducing persistent temperature anomalies, our investigation found that 25–60‐day ISVs over both subtropical jet (SJ) and polar front jet (PJ) regions regulate the NEC temperature via the modulation of humidity and related longwave radiation (LR). During positive (negative) phase of PJ ISV, advection of climatological potential vorticity by strong meridional winds within the cyclonic‐anticyclonic (anticyclonic‐cyclonic) circulation favors the wave train corresponding to negative (positive) phase of SJ ISV. This interaction further amplifies and prolongs the impacts of SJ and PJ ISVs nonlinearly, with temperature decreases during the configuration of positive SJ and negative PJ ISV becoming 83% larger, and 6 days longer. |
| format | Article |
| id | doaj-art-2c84791fff10426c9dd709a789b68f4a |
| 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-2c84791fff10426c9dd709a789b68f4a2025-08-20T03:58:44ZengWileyGeophysical Research Letters0094-82761944-80072025-07-015214n/an/a10.1029/2025GL116758Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast ChinaJianying Li0Ke Xu1Yang Chen2Jiangyu Mao3Panmao Zhai4Yuhan Yan5State Key Laboratory of Severe Weather Meteorological Science and Technology (LaSW) Chinese Academy of Meteorological Sciences Beijing ChinaState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaState Key Laboratory of Severe Weather Meteorological Science and Technology (LaSW) Chinese Academy of Meteorological Sciences Beijing ChinaState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaState Key Laboratory of Severe Weather Meteorological Science and Technology (LaSW) Chinese Academy of Meteorological Sciences Beijing ChinaState Key Laboratory of Severe Weather Meteorological Science and Technology (LaSW) Chinese Academy of Meteorological Sciences Beijing ChinaAbstract Northeast China (NEC) is one of the major crop producing regions in China, which is severely affected by persistently extreme temperatures during summer. Previous works focused on understanding the intensity of extreme temperatures, yet neglecting its duration and timing. Considering the critical role of 25–60‐day intraseasonal variability (ISV) in inducing persistent temperature anomalies, our investigation found that 25–60‐day ISVs over both subtropical jet (SJ) and polar front jet (PJ) regions regulate the NEC temperature via the modulation of humidity and related longwave radiation (LR). During positive (negative) phase of PJ ISV, advection of climatological potential vorticity by strong meridional winds within the cyclonic‐anticyclonic (anticyclonic‐cyclonic) circulation favors the wave train corresponding to negative (positive) phase of SJ ISV. This interaction further amplifies and prolongs the impacts of SJ and PJ ISVs nonlinearly, with temperature decreases during the configuration of positive SJ and negative PJ ISV becoming 83% larger, and 6 days longer.https://doi.org/10.1029/2025GL116758intraseasonal variabilitypersistently extreme temperaturenonlinear amplication |
| spellingShingle | Jianying Li Ke Xu Yang Chen Jiangyu Mao Panmao Zhai Yuhan Yan Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China Geophysical Research Letters intraseasonal variability persistently extreme temperature nonlinear amplication |
| title | Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China |
| title_full | Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China |
| title_fullStr | Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China |
| title_full_unstemmed | Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China |
| title_short | Interaction of 25–60‐Day Intraseasonal Variabilities Between Subtropical and Polar Regions Nonlinearly Amplifies and Prolongs the Extreme Temperature Over Northeast China |
| title_sort | interaction of 25 60 day intraseasonal variabilities between subtropical and polar regions nonlinearly amplifies and prolongs the extreme temperature over northeast china |
| topic | intraseasonal variability persistently extreme temperature nonlinear amplication |
| url | https://doi.org/10.1029/2025GL116758 |
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