2025-12-16 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/earth/202512/t20251216_1137262.shtml
- https://www.nature.com/articles/s41467-025-65904-8
偏西風の波状化が中緯度の水文気候の変動を調節する Westerly jet waviness modulates mid-latitude hydroclimate variability
Liangqing Cheng,Jingran Zhang,Yubin Wu,Jun Cheng,Liang Yi,Zhigang Zhang & Hao Long
Nature Communications Published:23 November 2025
DOI:https://doi.org/10.1038/s41467-025-65904-8
Abstract
The mid-latitude ecological environment is highly vulnerable, and increasing hydroclimate variability poses a significant threat to it. However, the mechanisms driving this variability remain unclear due to short observational records and climate model biases. Here, we present a sub-millennial resolution precipitation record spanning the past ~5.7 million years (Myr), derived from a 300.8-meter fluvio-lacustrine sediment core in mid-latitude East Asia (northern China). Our results reveal a persistent influence of the westerly jet on mid-latitude precipitation since the Pliocene, as well as a marked reduction in mid-latitude precipitation variability alongside amplified low-latitude variability after ~3 million years ago (Ma). Based on idealized sensitivity simulations, we attribute the amplified mid-latitude precipitation variability before ~3 Ma to enhanced westerly jet waviness driven by Arctic warming. Given projected increases in jet waviness under future global warming, we predict more frequent hydroclimate extremes in mid-latitude regions.
