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...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-07-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2025GL116758 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|---|
| ISSN: | 0094-8276 1944-8007 |