Northern annular mode and Northeast Asian temperature anomalies: exploring causality and the causes of its non-stationarity.
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| Title: | Northern annular mode and Northeast Asian temperature anomalies: exploring causality and the causes of its non-stationarity. |
|---|---|
| Authors: | Lin, Yating1,2 (AUTHOR), Wang, Geli1 (AUTHOR) wgl@mail.iap.ac.cn, Tsonis, Anastasios A.3 (AUTHOR) |
| Source: | Climate Dynamics. Oct2025, Vol. 63 Issue 10, p1-13. 13p. |
| Abstract: | To better understand the dynamics and impacts of major atmospheric modes on regional climates, the temporal variability of the causal strength between the Northern Hemisphere Annular Mode (NAM) and winter Surface Air Temperature (SAT) over Northeast Asia from 1950 to 2024 is explored, with particular emphasis on the modulating effect of Pacific Decadal Oscillation (PDO) phase shifts. Decadal variations in causal strength between SAT and NAM at different pressure levels are clearly observed. The influence of the stratospheric NAM on SAT is more pronounced than that of the tropospheric NAM. At lower levels, the causal strength remained relatively weak and exhibited two notable periods of decline: from the late 1950s to the mid-1970s, and after 2008. In the mid-troposphere, a weakening trend occurred from 1975 to 1995, followed by a substantial recovery that peaked around 2008. In the stratosphere, the causal strength remained consistently strong, with 10 hPa showing a significant upward trend from the early 1970s to the late 1980s. The relationship between NAM and SAT during winter is strongly modulated by PDO phase shifts, which affect the intensity of the Aleutian Low, thereby impacting the Pacific center of NAM and altering its influence on Northeast Asia. Additionally, variations in the strength of the stratospheric polar vortex (SPV) also modulate the phase of NAM, affecting winter SAT by altering the intensity of the westerlies and the East Asian Trough (EAT). [ABSTRACT FROM AUTHOR] |
| Copyright of Climate Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 188666673 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Northern annular mode and Northeast Asian temperature anomalies: exploring causality and the causes of its non-stationarity. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lin%2C+Yating%22">Lin, Yating</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Geli%22">Wang, Geli</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wgl@mail.iap.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Tsonis%2C+Anastasios+A%2E%22">Tsonis, Anastasios A.</searchLink><relatesTo>3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Climate+Dynamics%22">Climate Dynamics</searchLink>. Oct2025, Vol. 63 Issue 10, p1-13. 13p. – Name: Abstract Label: Abstract Group: Ab Data: To better understand the dynamics and impacts of major atmospheric modes on regional climates, the temporal variability of the causal strength between the Northern Hemisphere Annular Mode (NAM) and winter Surface Air Temperature (SAT) over Northeast Asia from 1950 to 2024 is explored, with particular emphasis on the modulating effect of Pacific Decadal Oscillation (PDO) phase shifts. Decadal variations in causal strength between SAT and NAM at different pressure levels are clearly observed. The influence of the stratospheric NAM on SAT is more pronounced than that of the tropospheric NAM. At lower levels, the causal strength remained relatively weak and exhibited two notable periods of decline: from the late 1950s to the mid-1970s, and after 2008. In the mid-troposphere, a weakening trend occurred from 1975 to 1995, followed by a substantial recovery that peaked around 2008. In the stratosphere, the causal strength remained consistently strong, with 10 hPa showing a significant upward trend from the early 1970s to the late 1980s. The relationship between NAM and SAT during winter is strongly modulated by PDO phase shifts, which affect the intensity of the Aleutian Low, thereby impacting the Pacific center of NAM and altering its influence on Northeast Asia. Additionally, variations in the strength of the stratospheric polar vortex (SPV) also modulate the phase of NAM, affecting winter SAT by altering the intensity of the westerlies and the East Asian Trough (EAT). [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Climate Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00382-025-07893-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 1 Titles: – TitleFull: Northern annular mode and Northeast Asian temperature anomalies: exploring causality and the causes of its non-stationarity. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lin, Yating – PersonEntity: Name: NameFull: Wang, Geli – PersonEntity: Name: NameFull: Tsonis, Anastasios A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 09307575 Numbering: – Type: volume Value: 63 – Type: issue Value: 10 Titles: – TitleFull: Climate Dynamics Type: main |
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