文献类型：期刊文献

英文题名：Enhanced intraseasonal rainfall variability over Northeast Australia

作者：Luo, Weijian[1,2];Leung, Jeremy Cheuk-Hin[2];Wang, Lei[1];Wang, Bin[3];Zhang, Banglin[2,4,5]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[2]Natl Univ Def Technol, Coll Meteorol & Oceanog, Changsha 410000, Peoples R China;[3]Taiyuan Univ Technol, Coll Comp Sci & Technol, Taiyuan 030024, Peoples R China;[4]China Meteorol Adm, Key Lab High Impact Weather Special, Changsha 410000, Peoples R China;[5]Lanzhou Univ, Coll Atmospher Sci, Lanzhou 730000, Peoples R China

年份：2026

卷号：21

期号：4

外文期刊名：ENVIRONMENTAL RESEARCH LETTERS

收录：SCI-EXPANDED(收录号：WOS:001695778100001)、、WOS

基金：This study is supported by the National Natural Science Foundation of China (42405038, 42575021), the Innovation Research Foundation of National University of Defense Technology (202402-YJRC-LJ-001), and the Innovative Team Plan for Department of Education of Guangdong Province (2023KCXTD015). We thank for the technical support of the National Large Scientific and Technological Infrastructure 'Earth System Numerical Simulation Facility' (https://cstr.cn/31134.02.EL).

语种：英文

外文关键词：rainfall; intraseasonal variability; Northeastern Australia; abnormal intraseasonal rainfall

外文摘要：Understanding changes in intraseasonal rainfall variability is critical for improving sub-seasonal prediction. While the amplification of intraseasonal rainfall variability across Australia has been reported, the spatial heterogeneity of this intensification has been overlooked. Here, we observe that the intraseasonal rainfall variability has been intensified, particularly over northeastern Australia during the wet season (November-April) over the past four decades. The intensified intraseasonal rainfall variability is primarily attributed to enhanced intensity of precipitation events, rather than drier spells. Moisture budget analysis indicates that the intensification of intraseasonal abnormal rainfall events over northeastern Australia is primarily due to the strengthened vertical advection of background moisture caused by the intraseasonal vertical motion anomalies. In this process, the strengthening of intraseasonal vertical velocity driven by changes in intraseasonal wind convergence plays a dominant role, accounting for over 90%, whereas the effect of background moisture changes is relatively less significant. Our findings highlight northeastern Australia as a hotspot for amplified intraseasonal rainfall variability, rather than the whole of Australia. This study provides fundamental insights into northern Australia's changing climate, and highlights the important role of intraseasonal circulation on northeastern Australia rainfall variability.