Potential connections between atmospheric rivers in China and Australia

IF 3.6 4区 地球科学 Q1 Earth and Planetary Sciences Journal of Southern Hemisphere Earth Systems Science Pub Date : 2020-09-17 DOI:10.1071/ES19027
Lin Xu, Huqiang Zhang, Weiwei He, Chengzhi Ye, A. Moise, José María Rodríguez
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引用次数: 4

Abstract

Results from a collaborative project between the Australian Bureau of Meteorology and China Meteorological Administration found that atmospheric rivers (ARs) can occur simultaneously in East Asia and Australia. Furthermore, ARs and the Northwest Cloud Band in the Australia region tend to reach their peaks during austral cool season (May–August). At the same time that the Asian summer monsoon develops and its meridional moisture transport and AR activities intensify. This has prompted us to explore potential connections of ARs in the two regions. In this study, we firstly analysed two ARs and their mechanism that occurred in China and Australia in June 2016, which caused significant rainfall in both countries. We then explored the atmospheric circulation background for such AR connections. From this case study, we show that ARs originating from the tropical Indian and Pacific oceans can become bifurcated through Indo-Pacific inter-basin interactions. The position of the bifurcation appears to depend on the location and intensity of Western Pacific Subtropical High (WPSH), the subtropical high in the Australian region and the middle-latitude storm track migration in the southern hemisphere. Moreover, by analysing bifurcated AR events from the past two decades, we show that they are more likely to occur during boreal summer months. Most of the bifurcations occurred in the boreal summer following the decaying phase of an El Niño in its preceding winter, due to a delayed El Niño Southern Oscillation influence on the WPSH and a subtropical high in the Australian region. Our research further demonstrates the value of applying AR analysis in improving our understanding of the weather and climate in the Australia–Asian monsoon region.
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中国和澳大利亚大气河流之间的潜在联系
澳大利亚气象局和中国气象局合作项目的结果发现,大气河流(ARs)可以同时发生在东亚和澳大利亚。此外,澳大利亚地区的ar和西北云带往往在南方凉爽季节(5 - 8月)达到峰值。与此同时,亚洲夏季风发展,经向水汽输送和AR活动增强。这促使我们探索两个地区ar的潜在联系。在这项研究中,我们首先分析了2016年6月发生在中国和澳大利亚的两次ar及其机制,这两次ar导致了两国的显著降雨。然后,我们探索了这种AR连接的大气环流背景。通过本案例研究,我们发现起源于热带印度洋和太平洋的ar可以通过印太盆地间相互作用而分叉。分岔的位置似乎取决于西太平洋副热带高压的位置和强度、澳大利亚地区副热带高压和南半球中纬度风暴路径的迁移。此外,通过分析过去20年的分岔AR事件,我们发现它们更有可能发生在北方夏季。由于厄尔Niño南方涛动对西太平洋高压的延迟影响和澳大利亚地区的副热带高压,大多数分叉发生在厄尔Niño在其前一个冬季的衰减阶段之后的北方夏季。我们的研究进一步证明了应用AR分析在提高我们对澳大利亚-亚洲季风区天气和气候的理解方面的价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Southern Hemisphere Earth Systems Science
Journal of Southern Hemisphere Earth Systems Science Earth and Planetary Sciences-Oceanography
CiteScore
8.10
自引率
8.30%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Journal of Southern Hemisphere Earth Systems Science (JSHESS) publishes broad areas of research with a distinct emphasis on the Southern Hemisphere. The scope of the Journal encompasses the study of the mean state, variability and change of the atmosphere, oceans, and land surface, including the cryosphere, from hemispheric to regional scales. general circulation of the atmosphere and oceans, climate change and variability , climate impacts, climate modelling , past change in the climate system including palaeoclimate variability, atmospheric dynamics, synoptic meteorology, mesoscale meteorology and severe weather, tropical meteorology, observation systems, remote sensing of atmospheric, oceanic and land surface processes, weather, climate and ocean prediction, atmospheric and oceanic composition and chemistry, physical oceanography, air‐sea interactions, coastal zone processes, hydrology, cryosphere‐atmosphere interactions, land surface‐atmosphere interactions, space weather, including impacts and mitigation on technology, ionospheric, magnetospheric, auroral and space physics, data assimilation applied to the above subject areas . Authors are encouraged to contact the Editor for specific advice on whether the subject matter of a proposed submission is appropriate for the Journal of Southern Hemisphere Earth Systems Science.
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