美国宾夕法尼亚大学Li, Xueke和Mann, Michael E.近日的研究，揭示了大气共振和陆地-大气反馈作为2021年6月太平洋西北热穹事件前兆的作用。相关论文于2024年1月16日发表在《美国科学院院刊》杂志上。

研究发现，作为2021年6月西北太平洋“热穹”事件的前兆，持续放大的大尺度大气环流状态与土壤湿度反馈之间存在相互作用。在此事件发生之前，一个扩展的共振行星波结构造成了前期土壤水分不足，通过强烈的非线性土壤水分反馈放大了低层大气变暖，并利于这一前所未有的高温事件。

据研究人员介绍，研究证明，在夏季极端天气中，行星波的类共振放大作用为间接作用而不是直接作用。

附：英文原文

Title: Role of atmospheric resonance and land–atmosphere feedbacks as a precursor to the June 2021 Pacific Northwest Heat Dome event

Author: Li, Xueke, Mann, Michael E., Wehner, Michael F., Rahmstorf, Stefan, Petri, Stefan, Christiansen, Shannon, Carrillo, Judit

Issue&Volume: 2024-1-16

Abstract: We demonstrate an indirect, rather than direct, role of quasi-resonant amplification of planetary waves in a summer weather extreme. We find that there was an interplay between a persistent, amplified large-scale atmospheric circulation state and soil moisture feedbacks as a precursor for the June 2021 Pacific Northwest “Heat Dome” event. An extended resonant planetary wave configuration prior to the event created an antecedent soil moisture deficit that amplified lower atmospheric warming through strong nonlinear soil moisture feedbacks, favoring this unprecedented heat event.

DOI: 10.1073/pnas.2315330121

Source: https://www.pnas.org/doi/abs/10.1073/pnas.2315330121