Differences in the destructiveness of tropical cyclones over the western North Pacific between slow- and rapid-transforming El Niño years

Tu, Shifei; Xu, Jianjun; Feng, Xinbin; Liang, Man; Ji, Qianqian; Chen, Siqi

doi:10.1088/1748-9326/ab6786

Cited by 10 publications

(8 citation statements)

References 47 publications

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“…The TCHP represents the heat contained in the upper layer of the 26 °C isotherm of the upper ocean. Based on previous studies 38 – 40 , it is defined as: where c p in Eq. ( 2 ) is the specific heat capacity at constant pressure, usually taken as 4178 J kg −1 °C −1 ; ρ the density of sea water, taken as 1026 kg m −3 in the upper ocean; D 26 the depth of the 26 °C isotherm, and T(z) the in-situ temperature from the ocean analysis data.…”

Section: Methodsmentioning

confidence: 99%

Recent global decrease in the inner-core rain rate of tropical cyclones

Chan

et al. 2021

Nat Commun

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Heavy rainfall is one of the major aspects of tropical cyclones (TC) and can cause substantial damages. Here, we show, based on satellite observational rainfall data and numerical model results, that between 1999 and 2018, the rain rate in the outer region of TCs has been increasing, but it has decreased significantly in the inner-core. Globally, the TC rain rate has increased by 8 ± 4% during this period, which is mainly contributed by an increase in rain rate in the TC outer region due to increasing water vapor availability in the atmosphere with rising surface temperature. On the other hand, the rain rate in the inner-core of TCs has decreased by 24 ± 3% during the same period. The decreasing trend in the inner-core rain rate likely results mainly from an increase in atmospheric stability.

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Section: Methodsmentioning

confidence: 99%

Recent global decrease in the inner-core rain rate of tropical cyclones

Chan

et al. 2021

Nat Commun

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“…All TCs, including tropical depressions, tropical storms and category 1–5, are considered in this study. Following Tu et al (2020), RT El Niño event is defined as an El Niño transformed to a La Niña within 3 months and ST El Niño event is identified as an event with no reduction from +0.5°C to −0.5°C within 6 months after the El Niño onset. Five RT El Niño events (1972/1973, 1982/1983, 1987/1988, 1997/1998, 2009/2010), and nine ST El Niño events (1951/1952, 1957/1958, 1965/1966, 1977/1978, 1991/1992, 1994/1995, 2002/2003, 2004/2005, 2006/2007) are identified based on these definitions.…”

Section: Methodsmentioning

confidence: 99%

“…This indicates a significant reduction (~64%) of low‐latitude TCs during RT events compared with ST events. However, the difference of TC number in the entire WNP basin is only 10.9% between ST and RT events, and it fails to pass the t ‐test (Tu et al, 2020). Meanwhile, the average genesis position of low‐latitude TCs shows similar meridional difference between RT and ST events compared with total TCs.…”

Section: Influences Of El Niño Decaying Pace On Low Latitude Tcmentioning

confidence: 99%

“…Small vertical wind shear (VWS), high mid‐tropospheric relative humidity (RH) and high TC heat potential (TCHP) are present over the westernmost WNP during this period. In contrast, genesis of TCs tend to occur over the southeastern part of the WNP and these storms usually have strong destructive potential in ST El Niño events (Tu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Influence of El Niño decaying pace on low latitude tropical cyclogenesis over the western North Pacific

Peng

et al. 2021

Intl Journal of Climatology

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The modulation of El Niño decaying pace on tropical cyclones (TCs) activities at low latitude (within 10°) over the western North Pacific (WNP) is investigated in this study. During rapidly decaying El Niño events, fewer TCs occur near the equator and the averaged genesis location is more westward. More TCs are found in the southeast of WNP during slowly decaying phase of El Niño events. The distinctive differences of TC genesis frequency and their respective meridional positions are related to the modulation of El Niño to large‐scale environmental flows. Both dynamical and thermodynamical conditions, such as low‐level vorticity, mid‐level relative humidity and vertical motion, are favourable for TC genesis in the southeast of WNP during slowly decaying El Niño events. The differences of sea surface temperature, vertical wind shear, and TC heat potential between the two El Niño events are similar to the spatial distribution of TC genesis at low latitude. Disturbances in southeastern WNP in slowly decaying El Niño events are more likely to develop into TCs due to the stronger zonal convergence and meridional shear of zonal wind. These findings may help to better understand the interaction between low‐latitude TCs and El Niño. The higher frequency of low‐latitude TC genesis and their more eastward TC genesis position in slowly decaying El Niño events may in turn slow down the transition speed of El Niño.

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“…In general, the average TC rain rate has been found to increase with TC intensity (Lonfat et al., 2004; Tu et al., 2021). The TC intensity over the western North Pacific (WNP) basin is greatly influenced by ENSO (El Niño‐Southern Oscillation) events (Camargo & Sobel, 2005; Chan, 1985, 2000; Chan et al., 1998; Tu et al., 2018, 2020). In El Niño years, WNP tends to have stronger and longer duration TCs, but the opposite situation occurs during La Niña years.…”

Section: Introductionmentioning

confidence: 99%

Opposite Changes in Tropical Cyclone Rain Rate During the Recent El Niño and La Niña Years

Chan

et al. 2022

Geophysical Research Letters

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In this paper, we investigate whether the relationship between the El Niño‐Southern Oscillation and tropical cyclone (TC) rain rate over the western North Pacific (WNP) changes between the global warming slowdown (2001–2012) and resumption (2013–2020) periods. Using high‐resolution satellite rainfall data, we show that the average TC rain rate increases by 9% but decreases by 14% during the recent El Niño and La Niña years (since 2013), respectively. During the El Niño years, the increase is related to higher TC track density at lower latitudes, where more water vapor and stronger convergence are present. On the other hand, the decrease in TC rain rate during the recent La Niña years is mainly related to an increase in track density at higher latitudes and a decrease in TC intensity. These changes in TC track density and intensity are both associated with the strengthening of the subtropical high since 2013.

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Differences in the destructiveness of tropical cyclones over the western North Pacific between slow- and rapid-transforming El Niño years

Cited by 10 publications

References 47 publications

Recent global decrease in the inner-core rain rate of tropical cyclones

Recent global decrease in the inner-core rain rate of tropical cyclones

Influence of El Niño decaying pace on low latitude tropical cyclogenesis over the western North Pacific

Opposite Changes in Tropical Cyclone Rain Rate During the Recent El Niño and La Niña Years

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