Relative vorticity is the major environmental factor controlling tropical cyclone intensification over the Western North Pacific

Wu, Yilan; Chen, Shumin; Li, Weibiao; Fang, Rong; Liu, Haoya

doi:10.1016/j.atmosres.2020.104874

Cited by 23 publications

(13 citation statements)

References 44 publications

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“…Wu et al . (2020) investigated the correlations between TC intensity and various atmospheric factors during the intensification stages of more than 180 TCs over the western North Pacific Ocean during 2003–2017. They showed that approximately 53% of TCs were dominantly affected by relative vorticity at 850 hPa.…”

Section: Resultsmentioning

confidence: 99%

Understanding the post‐monsoon tropical cyclone variability and trend over the Bay of Bengal during the satellite era

Tiwari

Rameshan

Kumar

et al. 2021

Quart J Royal Meteoro Soc

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An effort is made to investigate the tropical cyclone (TC) variability over the Bay of Bengal in the warming climate scenario during the satellite era (1979–2018). In this study, the authors investigate interannual variations in the overall capacity of the Bay of Bengal (BoB) basin in the post‐monsoon season to produce either intense or moderate TCs. Globally accepted and widely used metrics accumulated cyclone energy (ACE) and power dissipation index (PDI) are used to examine the energy and damage generated by TCs. A statistical change‐point analysis is conducted to detect the shift in the tropical cyclone frequency and ACE during the study period, indicating the year 1999 as a change point. The results show the increasing trend in ACE in the BoB during the post‐monsoon season with a statistical significance of 95%. On the contrary, the overall frequency is almost unchanged but has shown an increasing trend in the last decade of the study period. Additionally, atmospheric and ocean factors influencing the TC intensity are investigated by applying principal component analysis for three categories of TCs, viz. the very severe cyclonic storm, severe cyclonic storm, and cyclonic storm. Implementation of principal component analysis and correlations of maximum sustained wind speed (MSW2; intensity) with relative vorticity, minimum sea‐level pressure (MSLP), sea‐surface temperature (SST), specific rainwater content, and vertical wind shear revealed relative vorticity as the most dominating parameter amongst all governing factors which determine the final intensity of the BoB TCs. On the contrary, SST shows the different nature of the relationship with different TC categories.

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Section: Resultsmentioning

confidence: 99%

Understanding the post‐monsoon tropical cyclone variability and trend over the Bay of Bengal during the satellite era

Tiwari

Rameshan

Kumar

et al. 2021

Quart J Royal Meteoro Soc

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“…Environmental factors, especially large-scale relative vorticity at lower atmospheric levels (500-850 hPa), significantly affect cyclones [64][65][66] and influences their relative motion in the presence of another cyclone 21 . However, most previous studies 7,10,26,35 on binary cyclone interaction found it difficult to correctly incorporate these large-scale environmental circulation in cyclone models, leading to erroneous prediction of cyclone tracks.…”

Section: Methodology a Reanalysis Datasetmentioning

confidence: 99%

Study of Interaction and Complete Merging of Binary Cyclones Using Complex Networks

De¹,

Gupta²,

Unni³

et al. 2022

Preprint

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Cyclones are amongst the most hazardous extreme weather events on Earth. When two co-rotating cyclones come in close proximity, a possibility of complete merger (CM) arises due to their interactions. However, identifying the transitions in the interaction of binary cyclones and predicting the merger is challenging for weather forecasters. In the present study, we suggest an innovative approach to understand the evolving vortical interactions between the cyclones during two such CM events using time-evolving induced velocity based unweighted directed networks. We find that network-based indicators, namely, in-degree and out-degree, can quantify the changes during the interaction between two cyclones and are better candidates than the traditionally used separation distance to classify the interaction stages before a CM. The network indicators also help to identify the dominating cyclone during the period of interaction and quantify the variation of the strength of the dominating and merged cyclones. Finally, we show that the network measures also provide an early indication of the CM event well before its occurrence.

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“…The present study hypothesized that water-vapor content distribution can affect TC tracks, and examined the hypothesis through analyzing the Severe Typhoon Hato (2017) using the Weather Research and Forecasting (WRF) Model (Skamarock et al 2008). Our previous study showed that the intensification of Hato was significantly affected by environmental water vapor (Wu et al 2020). Hato developed over the western North Pacific, moved toward the west-northwest, and eventually made landfall on China's southern coast near Zhuhai (Guangdong Province), where it caused considerable loss of human life and substantial economic damage.…”

Section: Introductionmentioning

confidence: 97%

Influence of water vapor distribution on the simulated track of Typhoon Hato (2017)

et al. 2021

Self Cite

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Predicting tropical cyclone (TCs) tracks is a primary concern in TC forecasting. Some TCs appear to move in a direction favorable for their development, beyond the influence of the steering flow. Thus, we hypothesize that TCs move toward regions with high water-vapor content in the lower atmosphere. In this study, four numerical experiments, including a control experiment and three sensitivity experiments, were performed using the Weather Research and Forecasting Model, to analyze the relationship between water vapor distribution and the track of Severe Typhoon Hato (2017). Observations validated the features reproduced in the control experiment. The sensitivity experiments were conducted to explore variations in the TC track under different water vapor environments. Results indicate that the horizontal distribution of water-vapor content exerted a greater impact on the TC track than the steering flow when both factors were significant. Further analysis revealed that the TC’s movement vector was between the direction of the steering flow and the direction toward the peak of vorticity increasing area. The peaks of vorticity increasing area were close to the peaks of water vapor increasing area, which also proved the effect of water vapor distribution on the TC track. These results are expected to improve TC track analysis and forecasting.

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Relative vorticity is the major environmental factor controlling tropical cyclone intensification over the Western North Pacific

Cited by 23 publications

References 44 publications

Understanding the post‐monsoon tropical cyclone variability and trend over the Bay of Bengal during the satellite era

Understanding the post‐monsoon tropical cyclone variability and trend over the Bay of Bengal during the satellite era

Study of Interaction and Complete Merging of Binary Cyclones Using Complex Networks

Influence of water vapor distribution on the simulated track of Typhoon Hato (2017)

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