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Different interannual co-evolutionary models reveal how East Asia's jet stream and summer monsoon evolve together

Phys · · 484 words · By Institute; Chinese Academy

A study published in Atmospheric and Oceanic Science Letters examines the interannual co-evolutionary relationship between the East Asian Subtropical Westerly Jet and East Asian Summer Monsoon across three climate periods: Medieval Climate Anomaly, Little Ice Age, and Present Warm Period. Researchers used CESM-LME simulations to show a stable anti-phase relationship between the jet stream displacement and monsoon intensity, with notable shifts in the second MV-EOF mode during the Present Warm Period.

open_in_new Read the original article: https://phys.org/news/2026-04-interannual-evolutionary-reveal-east-asia.html

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confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

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4 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

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“The East Asian Subtropical Westerly Jet (EASWJ) and the East Asian Summer Monsoon (EASM) maintain a stable anti-phase relationship across the Medieval Climate Anomaly (MCA), Little Ice Age (LIA), and Present Warm Period (PWP) periods.”
DISPUTED
The claim asserts a stable anti-phase relationship across all periods, but evidence shows the EASM-precipitation relationship is only stable on centennial timescales (shorter timescales show instability). The millennial-scale anti-phase relationship is noted, but the claim's assertion of stability across all periods is contradicted by the evidence.
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web search NEUTRAL — However, the simulated EASM–precipitation relationship is only stable on a centennial and longer timescale and is unstable on a shorter timescale.
https://cp.copernicus.org/articles/14/577/2018/
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web search NEUTRAL — However, the simulated EASM–precipitation relationship is only stable on a centennial and longer timescale and is unstable on a shorter timescale.
https://www.stevenphipps.com/publications/shi2018_clim_past.…
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web search NEUTRAL — Millennial- to centennial-scale anti-phase relationship between the westerlies and the East Asian summer monsoon and its cultural response along the Silk Roads after a great earthquake in Southern Alt…
https://link.springer.com/article/10.1007/s11430-024-1505-3
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“A significant 'mode shift' occurs in the second MV-EOF mode, with out-of-phase (in-phase) relationships between EASWJ and EASM intensities in the midlatitudes (subtropics) during the MCA and LIA, whereas the PWP is characterized by a zonal displacement of the EASWJ with eastward (westward) shifts associated with stronger (weaker) EASM.”
SINGLE SOURCE
Only one relevant web search result explicitly mentions the 'mode shift' in the second MV-EOF mode with distinct EASWJ-EASM relationships during MCA/LIA and PWP. The other two web results are unrelated (YouTube and dark mode extensions).
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web search NEUTRAL — ..."mode shift" in the second MV-EOF mode: during the MCA and LIA, the dominant feature is an out-of-phase (in-phase) relationship between EASWJ and EASM intensities in the midlatitudes (subtropics), …
https://phys.org/news/2026-04-interannual-evolutionary-revea…
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web search NEUTRAL — About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How...
https://www.youtube.com/watch?v=RkOpO1Js5Jw
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web search NEUTRAL — Dark Mode: Switch to dark reading for night & day browsing. More than dark theme style, it ensures optimal eye protection. The best dark mode extension for Chrome. Enable dark theme on any website and…
https://chromewebstore.google.com/detail/dark-mode-night-eye…
verified
“Natural external forcings (solar activity, volcanic activity) and anthropogenic external forcings (greenhouse gas emissions, land-use change) have fundamentally different modulation effects on the East Asian monsoon system.”
VERIFIED
Multiple web search results indicate that natural forcings (solar, volcanic) and anthropogenic forcings (aerosols, land-use) influence the EASM differently. One study highlights anthropogenic aerosols weakening the EASM, while another notes decadal modulation by both external forcings and internal variability.
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wikipedia NEUTRAL — East Asian blepharoplasty, more commonly known as double eyelid surgery, is a cosmetic procedure that reshapes the skin around the eye to create a crease in an upper eyelid that naturally lacks one. T…
https://en.wikipedia.org/wiki/East_Asian_blepharoplasty
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wikipedia NEUTRAL — The Greater East Asia Co-Prosperity Sphere (Japanese: 大東亜共栄圏, Hepburn: Dai Tōa Kyōeiken), also known as the GEACPS, was a pan-Asian union that the Empire of Japan tried to establish. Initially, it cov…
https://en.wikipedia.org/wiki/Greater_East_Asia_Co-Prosperit…
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wikipedia NEUTRAL — Southeast Asia is the geographical southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of mainland Australia, which …
https://en.wikipedia.org/wiki/Southeast_Asia
+ 3 more evidence sources
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“The study systematically compares the co-evolutionary relationship between the EASWJ and EASM under different climatic backgrounds, revealing shifts influenced by external forcings and oceanic internal variabilities.”
CORROBORATED
Three web search results confirm the study's findings on co-evolutionary shifts between EASWJ and EASM under different climatic backgrounds, influenced by external forcings and oceanic variabilities.
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web search NEUTRAL — The second leading mode of MVEOF illustrates a different co-evolutionary relationship during the natural climatic periods (the MCA and LIA), characterized by in-phase variation of EASWJ and EASM inten…
https://www.sciencedirect.com/science/article/pii/S167428342…
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web search NEUTRAL — This study systematically compares the co-evolutionary relationship between the EASWJ and the EASM under different climatic backgrounds, revealing how this relationship shifts under the influence ...
https://www.eurekalert.org/news-releases/1124487
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web search NEUTRAL — Whether the co-evolutionary EASWJ-EASM relationship remains consistent under different climatic backgrounds has been a key question in both modern and paleoclimate research.
https://phys.org/news/2026-04-interannual-evolutionary-revea…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.