印度洋高纬度对澳大利亚维多利亚州冬季降水的影响

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
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引用次数: 0

摘要

众所周知,澳大利亚东南部维多利亚州的年际降雨量变化受许多大尺度和区域现象的影响,包括印度洋偶极子(IOD)、南方涛动指数(SOI)和南方环流模式(SAM)。然而,"上游 "区域环流或气压异常的作用只得到了有限的关注。过去几十年来,特别是 1960 至 2017 年间,该州冬季(5 月至 8 月)降雨量有所下降。本研究采用行动中心(COA)技术,研究了 1951-2021 年间维多利亚州冬季降水量与印度洋高气压(IOH)特征之间的关系。我们的研究表明,印度洋高纬度的变化与维多利亚州降水量的变化密切相关。联系最紧密的是印度洋高压(IOH_P)及其纵向位置(IOH_LN),而印度洋高纬度(IOH_LT)的影响很小。当 IOH_P 异常值为正值时,全州降水量较少,而 IOH_LN 的东移是降水量减少的主要因素。通过相关和多元回归分析,我们发现 IOH 指数可以解释 54% 的冬季降水量变化。这种关系的强度在该州北部稍弱,部分原因是大潜水山脉以北的 "西北云带 "的额外影响。最后,我们对 IOH 异常高(低)年进行了综合分析,以确定 IOH 影响维多利亚州降雨量的证据。这使我们能够揭示所揭示的关联背后的动力机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The role played by the Indian Ocean High in affecting winter precipitation over Victoria, Australia

The interannual rainfall variability over the southeast Australian state of Victoria is known to be influenced by a number of large scale and regional phenomena, including the Indian Ocean Dipole (IOD), Southern Oscillation Index (SOI), and Southern Annular Mode (SAM). However, the role of ‘upstream’ regional circulation or pressure anomalies has received only modest attention. The amount of winter (May-August) rainfall over the state has declined over the past few decades, especially from 1960 to 2017. Using the Center of Action (COA) technique this study examines the relationship between winter precipitation over Victoria and the characteristics of the Indian Ocean High (IOH) over the period 1951–2021. We show that variations of the IOH are strongly linked with those of precipitation over Victoria. The strongest link is with the Indian Ocean High pressure (IOH_P) and its longitudinal position (IOH_LN), whereas the Indian Ocean High latitude (IOH_LT) has little impact. Less precipitation is observed across the state when IOH_P anomalies are positive, whereas the eastward shift of the IOH_LN is a major factor in the reduction of precipitation. Using correlation and multiple regression analyses, we find that the IOH indices explain 54 % of the winter precipitation variation. The strength of this relationship is somewhat weaker in the northern part of the state, partly because of the additional influence of ‘north-west cloud bands’ north of the Great Diving Range. Finally, we perform composite analyses of anomalous high (low) years of IOH to establish evidence of IOH influencing Victorian rainfall. This allows us to reveal the dynamical mechanisms behind the revealed associations.

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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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