Seasonal Variability of Cyclone Heat Potential in the Bay of Bengal

Sadhuram, Y.; Rao, B. Hanumantha; Rao, D.P.; Shastri, P. N. M.; Subrahmanyam, M. V.

doi:10.1023/b:nhaz.0000031313.43492.a8

Cited by 39 publications

(27 citation statements)

References 10 publications

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“…From (Figure 7) and similar observations have been reported by Sadhuram et al (2004), who found that the UOHC was greater than 60 kj/ cm 2 in the eastern part of the bay during post-monsoon season, which is close to the present results. It is observed that in the month of May cyclones intensify in the western bay, where the UOHC is >110 kj/cm 2 , whereas in the postmonsoon season most of the cyclones intensify near the coast.…”

Section: Upper Ocean Heat Content (Uohc)supporting

confidence: 93%

“…where ρ is the density of water column above 26°C isotherm, C P is the specific heat of seawater at constant pressure, T is the average temperature of two consecutive layers of a depth increment dZ and D26 is the depth of the 26°C isotherm (Sarma et al 1990;Sadhuram et al 2004).…”

Section: Methodsmentioning

confidence: 99%

“…Most of the severe cyclones during pre-monsoon (April and May) and post-monsoon (October and November) seasons generally move towards the east coast of India, causing colossal loss of life and damage to property. A few cyclones move either northwards or northeast and hit the Bangladesh or Myanmar coasts (Sadhuram et al 2004). The essential conditions for the formation of cyclones are: (1) Sufficient ocean thermal energy, (2) enhanced mid-troposphere relative humidity, (3) conditional instability, (4) enhanced lower troposphere relative vorticity, (5) minimum weak vertical shear and (6) displacement at least 5 deg away from the Equator (Gray 1968).…”

Section: Introductionmentioning

confidence: 99%

“…The UOHC was found to be > 60 kj/cm 2 in the Andaman Sea, southern and central Bay of Bengal, where generally the cyclones generate and move during the post-monsoon (October and November) season (Sadhuram et al 2004). The relationship between the UOHC and the efficiency of intensification (EI, ratio between the severe storms and the total number of storms in a grid) under different seasons was examined by Sadhuram et al (2006).…”

Section: Introductionmentioning

confidence: 99%

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Role of upper ocean parameters in the genesis, intensification and tracks of cyclones over the Bay of Bengal

Maneesha

Sadhuram

Prasad

2015

Journal of Operational Oceanography

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It is well known that the frequency of cyclones is about four times higher over the Bay of Bengal when compared with the Arabian Sea. Most of the severe cyclones during pre-monsoon (April and May) and post-monsoon (October and November) seasons hit the east coast of India, causing colossal loss of life and damage to property. In this study an attempt has been made to show the importance of the upper ocean parameters known as the upper ocean heat content (UOHC) and the UOHC with stratification (UOHC S ). The UOHC has been computed considering the stratification parameter (S) for the first time. Most of the severe cyclones are forming over the UOHC range between 40-80 kj/cm 2 in the Bay of Bengal. The UOHC S was high ranging from 50-400 kj/cm 2 compared to the Pacific Ocean, which is due to high stratification (S ∼2-4). Climatology of cyclone tracks and the UOHC S and in situ observation from Argo suggest that most of the tracks in the pre-and postmonsoon seasons are influenced by the high UOHC S (>120 kj/cm 2 ). UOHC and S are the dominant factors during the pre-and post-monsoon seasons, respectively. In addition to the atmospheric parameters from ocean-side, UOHC and stratification appear to be the best parameters to examine the intensification and movement of the cyclones during the preand post-monsoon seasons over the Bay of Bengal.

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Section: Upper Ocean Heat Content (Uohc)supporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Role of upper ocean parameters in the genesis, intensification and tracks of cyclones over the Bay of Bengal

Maneesha

Sadhuram

Prasad

2015

Journal of Operational Oceanography

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“…The warming of the central basin caused by trapping of Kelvin waves in the central Bay for many months creates conducive environment for cyclogenesis (Saheb et al 2009). Sadhuram et al (2004) have reported that the climatological average value of tropical cyclone heat potential (TCHP) for the Bay is *60 kJ/cm 2 and is considered as the threshold values for cyclogenesis.…”

Section: Introductionmentioning

confidence: 99%

Development of tropical cyclone wind field for simulation of storm surge/sea surface height using numerical ocean model

Das

Mohanty

Indu

2015

Model. Earth Syst. Environ.

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Coupled ocean-atmospheric phenomenon such as tropical cyclones (TC's) is governed by geophysical fluid dynamics. TC associated strong wind stress transfer momentum energy to the ocean surface that acts as the prime mechanism in modulating the sea surface and in generating the storm surge. A primitive equation, Princeton ocean model (POM) with free surface, sigma (terrain-following) coordinates and realistic bottom topography is configured in Bay of Bengal (BoB) to simulate the storm surge/sea surface height (SSH) and surface currents during a super cyclone TC05B 1999. TC wind fields are developed by adopting a suitable formulation based on partial conservation of angular momentum. Modeled TC wind fields are superimposed with QuikSCAT Satellite/National Centre for Environmental Prediction (QSCAT/NCEP) blended ocean surface winds to drive the three-dimensional ocean model. Model simulated storm surge and SSH are compared with limited available surge estimates/observations and multi-satellite observed AVISO (Archive, Validation and Interpolation of Satellite Oceanography) SSH, respectively to evaluate its performance.

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Response of oceanic cyclogenesis metrics forNARGIScyclone: a case study

Vissa

Satyanarayana

Kumar

2013

Atmospheric Science Letters

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In this study, variability of two oceanic cyclogenesis metrics, tropical cyclone heat potential (TCHP) and effective oceanic layer for cyclogenesis (EOLC) in the Bay of Bengal (BoB) during NARGIS cyclone is investigated. EOLC represents the geopotential thickness of near surface stratified layer forms because of the spread of low salinity waters due to fresh water influx from rivers and precipitation. Climatological fields of TCHP and EOLC reveal that NARGIS translated towards the region of higher EOLC as seen in the observations. A maximum daily sea surface cooling of 2• C is observed along the right and rear side of NARGIS track.

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Seasonal Variability of Cyclone Heat Potential in the Bay of Bengal

Cited by 39 publications

References 10 publications

Role of upper ocean parameters in the genesis, intensification and tracks of cyclones over the Bay of Bengal

Role of upper ocean parameters in the genesis, intensification and tracks of cyclones over the Bay of Bengal

Development of tropical cyclone wind field for simulation of storm surge/sea surface height using numerical ocean model

Response of oceanic cyclogenesis metrics forNARGIScyclone: a case study

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