Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean

Uddin, Md. Jalal; Nasrin, Zahan Most.; Li, Yubin

doi:10.1016/j.dynatmoce.2020.101196

Cited by 13 publications

(5 citation statements)

References 46 publications

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“…By contrast, the vertical wind shear is (9.3 m/s, −0.9 m/s) for the TCs over the WSP basin. According to previous studies, the precipitation prefers the downshear to downshear‐left (downshear‐right) area and the right (left) side of TC's translation direction in the northern (southern) hemisphere when the wind shear is weak (∼5 m/s) (Kim et al., 2020; Uddin et al., 2021; Wingo & Cecil, 2010; Z. Yu et al., 2015). This conclusion is further verified in the precipitation analysis (Figures 2c and 2d).…”

Section: Resultsmentioning

confidence: 89%

Variation Trends of Asymmetrical Precipitable Water Vapor Outside the Tropical Cyclone Center Over the WNP and WSP Ocean

Yu,

Liu,

Yang

2023

Geophysical Research Letters

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Precipitable water vapor (PWV) is one of the crucial driving forces for tropical cyclone (TC) genesis. Under the impact of global warming, TCs have changed their way to concentrate PWV from the ambient atmosphere. This study starts with the asymmetric characteristics of PWV in the TC's north and south sides using altimetry‐satellite‐based PWV profiles paired with 367 TCs over the western Pacific Ocean between 2008 and 2020. The results suggest that the TC‐concentrated PWV has a north‐leaning and south‐leaning property over the western North Pacific (WNP) and western South Pacific (WSP), respectively. Moreover, it is observed that the radius of TC‐concentrated PWV has broadened by 5.44% (5.83%) over the WNP (WSP) from 2008 to 2020. In contrast, the PWV gradient has decreased by 23.5% (17.5%) over the WNP (WSP). Our findings highlight that the TC‐concentrated PWV can be used as an important indicator of TC responses to global warming.

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Section: Resultsmentioning

confidence: 89%

Variation Trends of Asymmetrical Precipitable Water Vapor Outside the Tropical Cyclone Center Over the WNP and WSP Ocean

Yu,

Liu,

Yang

2023

Geophysical Research Letters

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“…Previous study has demonstrated negative relationship between WS and TC intensity 33 . And the WS is mentioned as one of the key factors that increase the TC precipitation asymmetry 19,32,34,35 . Here we found that strong WS is likely to expand the precipitation area for TCs and increase the DIST30, which is more likely to happen when a mature TC translating to higher latitudes.…”

Section: Modeling Dist30 Using Machine Learningmentioning

confidence: 99%

“…As the eyewall disappears, the heavy precipitation center for ET storms usually moves further away from the storm center. In addition, the translation speed of TC also increases as it moves to higher latitude 31 , contributing to the asymmetry of TC precipitation 19,32 and possibly increase the DIST30. In addition to the general positive relationships with latitude, some high DIST30 values are also located in lower latitudes (between 20°S and 20°N, Fig.…”

Section: Modeling Dist30 Using Machine Learningmentioning

confidence: 99%

Global Expansion of Tropical Cyclone Precipitation Footprint

Zhu,

Qin,

Liu

et al. 2024

Preprint

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Precipitation from tropical cyclones (TCs) can cause massive damage from inland floods and will become more intense under warming climate. Knowledge gaps still exist in how the impact area and spatial pattern of heavy precipitation change with climate and environment. Here we defined a novel metric (DIST30) that represents the footprint of heavy TC precipitation based a high-resolution satellite precipitation product and global TC record over the past 41 years. We show that the DIST30 has increased significantly globally at a rate of 0.34 km per year. Spatially, DIST30 increases by 59.87% of the total TC impact area (8.79×107 km2), especially in the Western North Pacific, Northern Atlantic, and Southern Pacific. Machine learning model (XGBoost) demonstrated strong ability in both prediction performance and interpretation of the DIST30. We found that the monthly DIST30 variabilities are majorly controlled by the variations of TC maximum wind speed, TC location, sea surface temperature, vertical wind shear, and total water column. In particular, the DIST30 shows a very strong positive relationship with vertical wind shear. And more frequent TCs migrating to higher latitudes in North Hemisphere is the major contributor to the recent global upward trend in the DIST30.

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“…When the vortex associated with the remnants of Gulab tracked into the northern Arabian Sea on 30 September, the system was slow to develop. However, once it moved westwards into the northwestern Arabian Sea into an area of above average SSTs (Figure 2a) and subsurface ocean temperatures (Figure 2b) as well as reduced vertical wind shear (200-850 hPa), generally below ±8 m s −1 (Figure 2c) which is considered weak to moderate shear in the region (Uddin et al, 2021), it intensified rapidly acquiring a well-developed eye (Figure 1a). During this time, the central pressure dropped to 984 hPa and the maximum sustained surface wind reached about 31 m s −1 , with the storm maintaining its strength until making landfall in Oman (Figure 1d).…”

Section: Overview Of Tropical Cyclones Shaheen and Gonumentioning

confidence: 99%

Key Factors Modulating the Threat of the Arabian Sea's Tropical Cyclones to the Gulf Countries

2022

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The Arabian Sea is a body of water located in the northwestern Indian Ocean. It extends to about 25°N and from the shores of Somalia on the western side, to the Arabian Peninsula (AP), Iran and Pakistan on the northwestern and northern sides, and western India on the eastern side (Qasim, 1982). The atmospheric circulation here is dominated by the Asian monsoon system, with prevailing low-level southwesterly winds in the summer season and northeasterly winds in the winter months (Schott et al., 2009). Tropical cyclone (hereafter TC) formation is unfavorable in July and August due to the (a) presence of substantial vertical wind shear, when the strong low-level southwesterly winds co-occur with upper-level easterlies associated with the Asian summer monsoon anticyclone (Basha et al., 2020), and (b) copious amounts of precipitation that lower the sea surface temperatures (SSTs) through local air-sea interactions (Fu et al., 2002). Hence, TCs typically form in the pre-monsoon (May and June) or post-monsoon (October and November) months, with an average of one storm per season (Al-Maskari, 2012;Gray, 1968). Cooler SSTs, prevailing anticyclonic relative vorticity, and higher vertical wind shear arising from the presence of the subtropical jet at upper-levels prevent storms from developing in the winter months (Evan & Camargo, 2011). The main trigger of TC formation in the northern Indian Ocean is the Madden-Julian Oscillation (MJO; Madden & Julian, 1994), which is the dominant mode of tropical intraseasonal (30-90 days) variability. The MJO is characterized by regions of enhanced/suppressed convection that propagate eastwards across the tropics, with a poleward component in the boreal summer season (Kawamura et al., 1996). Krishnamohan et al. (2012) reported that roughly 82% of the TCs which formed in the area from 1979 to 2008 occurred during active phase of the MJO. There is also considerable interannual variability, with the higher SSTs and a more favorable dynamic and thermodynamic forcing in Central Pacific El Nino and Southern Oscillation (ENSO; Ashok & Yamagata, 2009) as opposed to eastern Pacific El Nino Southern Oscillation (ENSO) events, leading to an increased likelihood of TC formation in the Arabian Sea (Sumesh & Ramesh Kumar, 2013). The recent increase in SSTs in the basin in conjunction with the Pacific Decadal Oscillation (Mantua & Hare, 2002) also contributes to more active TC seasons (Rajeevan et al., 2013).While TCs are regularly seen in the Arabian Sea, it is rare for them to move into the Sea of Oman, a small body of water that borders Oman, the United Arab Emirates (UAE), Iran and western Pakistan. Only two such occurrences have been reported since 1900 (Mahmoud, 2021): TC Gonu in 2007 which, as of 2021, is the strongest TC

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Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean

Cited by 13 publications

References 46 publications

Variation Trends of Asymmetrical Precipitable Water Vapor Outside the Tropical Cyclone Center Over the WNP and WSP Ocean

Variation Trends of Asymmetrical Precipitable Water Vapor Outside the Tropical Cyclone Center Over the WNP and WSP Ocean

Global Expansion of Tropical Cyclone Precipitation Footprint

Key Factors Modulating the Threat of the Arabian Sea's Tropical Cyclones to the Gulf Countries

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