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

• 成果类型: Article
• 署名作者: Li, Xueke; Mann, Michael E.; Wehner, Michael F.; Rahmstorf, Stefan; Petri, Stefan; Christiansen, Shannon; Carrillo, Judit
• 署名单位: University of Pennsylvania; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; Potsdam Institut fur Klimafolgenforschung; University of Potsdam
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12404
• DOI: 10.1073/pnas.2315330121
• 发表日期: 2024-01-23
• 关键词: climate-change; summer; wave; amplification; circulation; northern; propagation; heatwaves; DYNAMICS; weather

摘要

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.