Predecessor Rain Events in the Yangtze River Delta Region Associated with South China Sea and Northwest Pacific Ocean (SCS-WNPO) Tropical Cyclones

Xu, Haodan; Li, Xiaofan; Yin, Jinfang; Zhang, Dengrong

doi:10.1007/s00376-022-2069-3

Cited by 7 publications

(5 citation statements)

References 73 publications

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“…Further statistical studies and numerical simulations are needed to examine the formation of outer rainband under various conditions of landfalling TC (intensity, size, and the relative position to land). Besides, the outer rainband case in this study is somewhat similar to the predecessor rain events in terms of distinct heavy rainfall that develops ahead of landfalling TCs (Cote, 2007; Galarneau et al., 2010; H. Y. Xu et al., 2023). The predecessor rain events are related to the deep moisture from outer TC circulation and the synoptic lifting from mid‐latitude weather systems, while the case in current study is a result of the outer TC circulation and land surface heating.…”

Section: Conclusion and Discussionsupporting

confidence: 62%

Section: Conclusion and Discussionsupporting

confidence: 51%

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Outer Rainband Formation on Land Ahead of Typhoon Hato (2017)

Ruan,

Chen,

Bai

2023

JGR Atmospheres

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An outer rainband develops rapidly on land of South China from afternoon to evening of 22 August 2017 when Typhoon Hato is approaching, leading to an early arrival of convective storms prior to typhoon's landfall. The convective cells initiate on the eastern coasts and move to the western inland region where they grow upscale into a fully fledged outer rainband. Convective‐permitting simulations suggest that the new‐born convective cells on the eastern coasts are associated with the increasing convective instability and low‐level lifting by the land‐sea differences of non‐gradient winds. Such differences are established by the horizontal and vertical components of thermal contrasts. In the following stage of convection organization, the convectively induced cold pools in turn strengthen the updrafts at their leading edges, which help to organize the convective cells on rainband as a fast‐moving squall line in the western region. Such storm‐feedback processes of rainband convection and cold pools strongly respond to the changing convective instability and mid‐level dry conditions on land. These regional environmental conditions are closely associated with the large‐scale subsidence in the outer region of typhoon. The results highlight that the new outer rainband can form rapidly on land due to surface heating, and the storm‐feedback processes in response to the changing environmental conditions when a tropical cyclone is approaching land.

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Section: Conclusion and Discussionsupporting

confidence: 62%

Section: Conclusion and Discussionsupporting

confidence: 51%

Outer Rainband Formation on Land Ahead of Typhoon Hato (2017)

Ruan,

Chen,

Bai

2023

JGR Atmospheres

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“…The torrential rainfall that fell over the YRD illustrates the role of moisture transport induced by Mangkhut . TC‐induced moisture transport is the part of the IVT pathway outside or outward of the TC vicinity whose moisture transport source is the TC (Knaff et al ., 2014; Sun et al ., 2017; Yin et al ., 2022; Xu et al ., 2023). Consistent with Pan and Lu (2019), the intensity of TC‐induced remote moisture transport should be larger than the Gaussian kernel smoothed 85% quantiles, depending on the time and region.…”

Section: Algorithms and Validationsmentioning

confidence: 99%

“…TC‐induced remote moisture transport refers to a moisture transport pathway outside or outward from a TC's vicinity (roughly 500 km, depending on the size of the TC) but whose moisture transport source is the TC (Knaff et al ., 2014; Sun et al ., 2017; Yin et al ., 2022; Xu et al ., 2023). Such pathways of moisture transport are essential causes of torrential rainfall outside the TC's realm.…”

Section: Introductionmentioning

confidence: 99%

Objective identification of tropical cyclone‐induced remote moisture transport using digraphs

Xiao,

Zhang,

Chen

et al. 2023

Quart J Royal Meteoro Soc

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Tropical cyclone (TC)–induced remote moisture transport is the fundamental cause of TC‐induced remote precipitation. However, despite increasing attention having been paid to TC‐induced remote moisture transport over the past few decades, a method for the objective identification of TC remote moisture transport remains lacking, which is crucial to understanding the complex rainfall mechanisms associated with TC‐induced remote moisture transport over recent decades. We set out to solve this issue in the present study by using a series of newly developed processing algorithms. Firstly, we identified vertically integrated water vapor transport (IVT) pathways using spatially smoothed moving window quantiles, and then used the maximum gradient method to segment IVT clusters from pathways. Relationship digraphs were constructed for IVT clusters to flexibly interpret the spatiotemporal merging and splitting processes among them. Finally, TC clusters (TCCs) and TC remote Clusters (TRCs) were identified in succession based on the TC tracks and diagraphs of IVT clusters. Applications of these processing algorithms showed that the TCCs and TRCs at the same timestep can be identified successfully by applying our method. The generality of the objective identification method was validated using data covering four decades. Our algorithms revealed discontinuous and uneven moisture transport, especially those associated with TCs, which benefits studies of remote rainfall associated with TCs. Furthermore, it facilitates the construction of IVT pathway and cluster datasets covering the past several decades, which can be used for analyzing related characteristics and thereby revealing possible physical mechanisms underlying the nature of TRCs.This article is protected by copyright. All rights reserved.

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“…TRP occurs almost every year in the YRDR of China. According to statistics, 252 typhoons occurred in the South China Sea-West Pacific region between 2010 and 2019, of which 73 made landfall in China, and it is worth noting that the amount of TRP in the YRDR triggered by these landing typhoons accounted for 10% of the total number of landing typhoons [10]. The super-typhoon Mangkhut (2018) in 2018 had a significant impact on Guangdong Province directly, leading to heavy rainfall in the YRDR, which was 1300 km away from Guangdong.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Satellite Products in Estimating Tropical Cyclone Remote Precipitation over the Yangtze River Delta Region

Wu,

Liu,

Liu

et al. 2024

Atmosphere

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Satellite products have shown great potential in estimating torrential rainfall due to their wide and consistent global coverage. This study assessed the monitoring capabilities of satellite products for the tropical cyclone remote precipitation (TRP) over the Yangtze River Delta region (YRDR) associated with severe typhoon Khanun (2017) and super-typhoon Mangkhut (2018). The satellite products include the CPC MORPHing technique (CMORPH) data, Tropical Rainfall Measuring Mission 3B42 Version 7 (TRMM 3B42), and Integrated Multi-satellite Retrievals for the Global Precipitation Measurement Mission (GPM IMERG). Eight precision evaluation indexes and statistical methods were used to analyze and evaluate the monitoring capabilities of CMORPH, TRMM 3B42, and GPM IMERG satellite precipitation products. The results indicated that the monitoring capability of TRMM satellite precipitation products was superior in capturing the spatial distribution, and GPM products captured the temporal distributions and different category precipitation observed from gauge stations. In contrast, the CMORPH products performed moderately during two heavy rainfall events, often underestimating or overestimating precipitation amounts and inaccurately detecting precipitation peaks. Overall, the three satellite precipitation products showed low POD, high FAR, low TS, and high FBIAS for heavy rainfall events, and the differences in monitoring torrential TRP may be related to satellite retrieval algorithms.

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Predecessor Rain Events in the Yangtze River Delta Region Associated with South China Sea and Northwest Pacific Ocean (SCS-WNPO) Tropical Cyclones

Cited by 7 publications

References 73 publications

Outer Rainband Formation on Land Ahead of Typhoon Hato (2017)

Outer Rainband Formation on Land Ahead of Typhoon Hato (2017)

Objective identification of tropical cyclone‐induced remote moisture transport using digraphs

Assessment of Satellite Products in Estimating Tropical Cyclone Remote Precipitation over the Yangtze River Delta Region

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