scholarly journals Tropical Cyclone Heat Potential and the Rapid Intensification of Hurricane Harvey in the Texas Bight

2019 ◽  
Vol 124 (4) ◽  
pp. 2440-2451 ◽  
Author(s):  
Henry Potter ◽  
Steven F. DiMarco ◽  
Anthony H. Knap
Keyword(s):  
Tropical Cyclone ◽  
Rapid Intensification ◽  
Tropical Cyclone Heat Potential ◽  
Heat Potential

scholarly journals Effects of ocean eddies on the tropical storm Roanu intensity in the Bay of Bengal

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247521
Author(s):  
Yujun Liu ◽  
Haibin LÜ ◽  
Honghua Zhang ◽  
Yusheng Cui ◽  
Xueting Xing
Keyword(s):  
Tropical Cyclone ◽  
Bay Of Bengal ◽  
Tropical Storm ◽  
The West ◽  
Initial Development ◽  
Ocean Eddies ◽  
Tropical Cyclone Heat Potential ◽  
Warm Eddy ◽  
Heat Potential ◽  
Cold Eddy

A tropical storm (TS) Roanu occurred in northern Sri Lanka in 2016, which transported northwards along the west coast of the Bay of Bengal (BoB). During the development of the TS, ocean eddies on its track had an important effect on the intensity of Roanu. The dynamic mechanism was investigated with multisource reanalysis and Argo float data in this study. The results show that ocean eddies were the main reason why Roanu first enhanced, weakened, and then enhanced again. Warm eddy W1 supports the initial development of the TS, cold eddy C1 weakens Roanu, and warm eddy W2 continues to support Roanu. On May 19, 2016, the maximum average latent heat flux over W1 was 260.85 w/m2, while that of C1 was only 200.71 w/m2. After the passage of Roanu, the tropical cyclone heat potential (TCHP) of eddies significantly decreased. The TCHP of W1, W2, C1 and C2 decreased by 20.95 kJ/cm2, 11.07 kJ/cm2, 29.82 kJ/cm2, 9.31 kJ/cm2, respectively. The mixed layer of warm eddies deepened much more than that of cold eddies, supporting Roanu development. In addition, changes in potential vorticity (PV) values caused by the disturbance of eddies may also reflect changes in the TS intensity. This study offers new insights on the influence of ocean eddies in regulating the development of tropical cyclone (TC) in the BoB.

scholarly journals Multidecadal Variability of Tropical Cyclone Rapid Intensification in the Western North Pacific

2015 ◽  
Vol 28 (9) ◽  
pp. 3806-3820 ◽  
Author(s):  
Xidong Wang ◽  
Chunzai Wang ◽  
Liping Zhang ◽  
Xin Wang
Keyword(s):  
Tropical Cyclone ◽  
North Pacific ◽  
Wind Shear ◽  
Western North Pacific ◽  
Large Scale ◽  
Vertical Wind Shear ◽  
Trade Wind ◽  
Rapid Intensification ◽  
Multidecadal Variability ◽  
Heat Potential

Abstract This study investigates the variation of tropical cyclone (TC) rapid intensification (RI) in the western North Pacific (WNP) and its relationship with large-scale climate variability. RI events have exhibited strikingly multidecadal variability. During the warm (cold) phase of the Pacific decadal oscillation (PDO), the annual RI number is generally lower (higher) and the average location of RI occurrence tends to shift southeastward (northwestward). The multidecadal variations of RI are associated with the variations of large-scale ocean and atmosphere variables such as sea surface temperature (SST), tropical cyclone heat potential (TCHP), relative humidity (RHUM), and vertical wind shear (VWS). It is shown that their variations on multidecadal time scales depend on the evolution of the PDO phase. The easterly trade wind is strengthened during the cold PDO phase at low levels, which tends to make equatorial warm water spread northward into the main RI region rsulting from meridional ocean advection associated with Ekman transport. Simultaneously, an anticyclonic wind anomaly is formed in the subtropical gyre of the WNP. This therefore may deepen the depth of the 26°C isotherm and directly increase TCHP over the main RI region. These thermodynamic effects associated with the cold PDO phase greatly support RI occurrence. The reverse is true during the warm PDO phase. The results also indicate that the VWS variability in the low wind shear zone along the monsoon trough may not be critical for the multidecadal modulation of RI events.

scholarly journals Western North Pacific Tropical Cyclone Characteristics Stratified by Genesis Environment

2018 ◽  
Vol 146 (2) ◽  
pp. 435-446 ◽  
Author(s):  
Hironori Fudeyasu ◽  
Ryuji Yoshida
Keyword(s):  
Tropical Cyclone ◽  
North Pacific ◽  
Western North Pacific ◽  
Convective Available Potential Energy ◽  
The Philippines ◽  
Vertical Shear ◽  
Occurrence Rate ◽  
Tropical Cyclone Heat Potential ◽  
Heat Potential ◽  
Confluence Region

Abstract The characteristics of tropical cyclones (TCs) in the summer and autumn seasons over the western North Pacific that are associated with different environmental factors that influence TC genesis (TCG) were studied. The authors objectively categorized factors into the five TCG factors classified by Ritchie and Holland: monsoon shear line (SL), monsoon confluence region (CR), monsoon gyre (GY), easterly wave (EW), and the Rossby wave energy dispersion from a preexisting TC (PTC). The GY-TCs tended to develop slowly, and the highest rates of occurrence of rapid intensification (RI) were found for the CR-TCs, whereas the GY-TCs rarely experienced RI. The average storm size of the GY-TCs at the time of formation was the largest of the averages among the TC types, while the EW- and PTC-TCs were smaller, although these differences disappeared at the mature time. There were no significant differences in the sea surface temperature (SST) beneath the TCs, but the tropical cyclone heat potential (TCHP) of the PTC-TCs was higher. The PTC-TCs tended to develop as intense TCs and exhibited favorable environmental characteristics, such as high TCHP, high convective available potential energy, and weak vertical shear. The occurrence rate of the PTC-TCs that made landfall in the Philippines was higher than the averages of the other TC types, whereas those of the EW-TCs (PTC-TCs) that made landfall in Japan (China) were lower. These results provide important information for use in disaster prevention.

scholarly journals Tropical Cyclone Heat Potential (TCHP) from the NCMRWF NEMO based global ocean analysis and forecast system

MAUSAM ◽  
2021 ◽  
Vol 72 (1) ◽  
pp. 207-214
Author(s):  
I. M. MOMIN ◽  
ANANYA KARMAKAR ◽  
ANKUR GUPTA ◽  
ASHIS K. MITRA
Keyword(s):  
Tropical Cyclone ◽  
Global Ocean ◽  
Forecast System ◽  
Tropical Cyclone Heat Potential ◽  
Heat Potential
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