The role of atmospheric fronts in austral winter precipitation changes across Australia

The role of atmospheric fronts in austral winter precipitation changes across Australia
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大气锋面在澳大利亚冬季降水变化中的作用

DOI:
10.1002/asl.1117
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发表时间:
2022
影响因子:
3
通讯作者:
Ummenhofer, Caroline C.
Ummenhofer, Caroline C.
中科院分区:
地球科学4区
文献类型:
--
作者:
Lawrence, Lindsay;Parfitt, Rhys;Ummenhofer, Caroline C.

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在过去的几十年里,澳大利亚东南部经历了严重的区域气候事件和一些有记录以来最极端的干旱,部分原因与厄尔尼诺南方涛动(ENSO)和印度洋偶极子(IOD)的影响有关。在这篇文章中,南方冬季降雨异常的程度,在导致共同发生的ENSO和IOD事件的年份,具体通过大气锋的变化进行了量化。最极端的湿(干)条件发生在冬季,其特征是海面温度异常模式表现出拉尼娜-负IOD(厄尔尼诺-正IOD)的特征。研究发现,这些降水异常大多与大气锋通过时降水的变化有关。虽然有一些建议,有伴随的大气锋的频率的变化,响应似乎是由每个单独的大气锋的降水量的变化占主导地位。此外,个别大气锋的动力强度分布相对保持不变。
Over the past few decades, Southeast Australia has experienced severe regional climatic events and some of the most extreme droughts on record, linked in part to influences from both the El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). In this article, the extent to which austral winter rainfall anomalies, in years leading into co‐occurring ENSO and IOD events, are communicated specifically through variations in atmospheric fronts is quantified. The most extreme wet (dry) conditions occur in winters characterized by sea surface temperature anomaly patterns exhibiting features of La Niña‐Negative IOD (El Niño‐Positive IOD). It is found that most of these precipitation anomalies are related to changes in the precipitation associated with the passing of atmospheric fronts specifically. Although there is some suggestion that there are accompanying changes in the frequency of atmospheric fronts, the response appears to be dominated by changes in the amount of precipitation per individual atmospheric front. In addition, the distribution in the dynamic strength of individual atmospheric fronts remains relatively unchanged.
1979-1996年和1997-2015年天气系统对澳大利亚南部降雨量的不同作用
DOI: --
发表时间: 2021
期刊: Climate Dynamics
影响因子: 4.6
作者:
A. Pepler;A. Dowdy;P. Hope
通讯作者: P. Hope
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影响因子: 4.9
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DOI: 10.1175/jcli4155.1
发表时间: 2007-07
期刊: Journal of Climate
影响因子: 4.9
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K. Ashok;H. Nakamura;T. Yamagata
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