Microphysical mechanisms of wintertime postfrontal precipitation enhancement over the Australian Snowy Mountains

IF 3 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Quarterly Journal of the Royal Meteorological Society Pub Date : 2023-12-25 DOI:10.1002/qj.4646

Artur Gevorgyan, Steven Siems, Yi Huang, Luis Ackermann, Michael Manton

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Abstract

A heavy orographic precipitation event associated with the postfrontal sector of a mid-latitude cyclone over the Australian Snowy Mountains (ASM) was analysed using field observations and numerical simulations. This event, observed during a 2018 intensive field campaign, was of particular interest as three distinct precipitation episodes were identified within a prolonged postfrontal period. Deep mixed-phase clouds (MPCs) characterised by cold cloud-top temperatures (colder than -30°C) and the presence of updrafts extending 3.5–4.5 km above the boundary-layer height produced the three enhanced precipitation events over the windward slopes of the ASM. The presence of conditional instabilities and deep updrafts were also found in the sounding and Doppler velocity observations, respectively, while the cloud radar observations show the deep MPCs with cloud-tops reaching to 6–7 km above sea-level. Orographic convection invigoration (OCI) was found to be the main mechanism producing the precipitation enhancement over the windward slopes and higher terrain.

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澳大利亚雪山冬季后锋面降水增强的微物理机制

利用实地观测和数值模拟分析了与澳大利亚雪山（ASM）上空的中纬度气旋后锋面区相关的强地貌降水事件。该事件是在 2018 年的一次密集实地活动中观测到的，在一个较长的后锋面时段内发现了三个不同的降水事件，因此特别引人关注。以低云顶温度（低于-30°C）为特征的深层混合相云（MPC）和边界层高度以上 3.5-4.5 千米的上升气流的存在，在 ASM 的迎风坡上产生了三次增强降水事件。探测和多普勒速度观测也分别发现了条件不稳定性和深层上升气流的存在，而云雷达观测则显示了云顶高达海平面 6-7 千米的深层 MPC。研究发现，迎风坡和较高地形上的降水增强的主要机制是液相对流增强（OCI）。

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

Quarterly Journal of the Royal Meteorological Society 地学-气象与大气科学

CiteScore

16.80

自引率

4.50%

发文量

163

审稿时长

3-8 weeks

期刊介绍： The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.