A study on some basic features of inertial oscillations and near-inertial internal waves

Chen, Shengli; Chen, Daoyi; Xing, Jiuxing

doi:10.5194/os-13-829-2017

Cited by 14 publications

(22 citation statements)

References 25 publications

(41 reference statements)

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“…Meanwhile, notable rightward biases and small coastal near-inertial energy are shown in Figure 4. The small coastal NIKE is well-documented in the previous studies and always due to the confined propagation near the coastal area and the shallow water depth [54][55][56].…”

Section: Oceanic Nike Induced By 12 Typhoons and The Corresponding Niwssupporting

confidence: 64%

Correlation of Near-Inertial Wind Stress in Typhoon and Typhoon-Induced Oceanic Near-Inertial Kinetic Energy in the Upper South China Sea

Liu

et al. 2019

Atmosphere

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The correlation of near-inertial wind stress (NIWS) in typhoon and typhoon-induced oceanic near-inertial kinetic energy (NIKE) in the upper South China Sea (SCS) is investigated through reanalysis data and an idealized typhoon model. It is found that the typhoon-induced oceanic near-inertial currents are primarily induced by the NIWS, which may contribute to about 80% of the total NIKE induced by typhoon. The intensities and distributions of NIWS in most typhoons are consistent with the magnitudes and features of NIKE. The NIWS and the NIKE along the typhoon track have positive correlations with the maximum wind speed of a typhoon, but there is an optimal translation speed for NIWS, at which the wind energy of the near-inertial band reaches its maximum. In the idealized typhoon model, a cluster of high-value centers of NIWS appear along the typhoon track, but there is only one high-value center for the near-inertial currents. The maximum NIWS arrives about 15 hours prior to the maximum near-inertial current. The distribution of NIWS is apparently asymmetric along the typhoon track, which may be due to the smaller eastward component of wind energy.

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Section: Oceanic Nike Induced By 12 Typhoons and The Corresponding Niwssupporting

confidence: 64%

Correlation of Near-Inertial Wind Stress in Typhoon and Typhoon-Induced Oceanic Near-Inertial Kinetic Energy in the Upper South China Sea

Liu

et al. 2019

Atmosphere

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“…The NIO is found to decline with decreasing depth and vanishes in the coastal regions (Schahinger, 1988;Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 93%

“…This high magnitude of kinetic energy is linked to strong wind and the rotating wind vector conditions of the storm. The spatial distribution of near-inertial energy is primarily controlled by the boundary effect for inertial oscillations (Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Estimation of oceanic subsurface mixing under a severe cyclonic storm using a coupled atmosphere–ocean–wave model

2018

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Abstract. A coupled atmosphere-ocean-wave model was used to examine mixing in the upper-oceanic layers under the influence of a very severe cyclonic storm Phailin over the Bay of Bengal (BoB) during 10-14 October 2013. The coupled model was found to improve the sea surface temperature over the uncoupled model. Model simulations highlight the prominent role of cyclone-induced near-inertial oscillations in subsurface mixing up to the thermocline depth. The inertial mixing introduced by the cyclone played a central role in the deepening of the thermocline and mixed layer depth by 40 and 15 m, respectively. For the first time over the BoB, a detailed analysis of inertial oscillation kinetic energy generation, propagation, and dissipation was carried out using an atmosphere-ocean-wave coupled model during a cyclone. A quantitative estimate of kinetic energy in the oceanic water column, its propagation, and its dissipation mechanisms were explained using the coupled atmosphere-ocean-wave model. The large shear generated by the inertial oscillations was found to overcome the stratification and initiate mixing at the base of the mixed layer. Greater mixing was found at the depths where the eddy kinetic diffusivity was large. The baroclinic current, holding a larger fraction of kinetic energy than the barotropic current, weakened rapidly after the passage of the cyclone. The shear induced by inertial oscillations was found to decrease rapidly with increasing depth below the thermocline. The dampening of the mixing process below the thermocline was explained through the enhanced dissipation rate of turbulent kinetic energy upon approaching the thermocline layer. The wave-current interaction and nonlinear wave-wave interaction were found to affect the process of downward mixing and cause the dissipation of inertial oscillations.

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“…The NIO is found to decline with decreasing depth and vanishes in the coastal regions (Schahinger, 1988;Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 93%

“…This decrease in SST is caused by the entrainment of cool subsurface thermocline water from the mixed layer into the immediate overlying layer of water. This cooling of surface water is one of the reasons for the decay of cyclones (Cione and Uhlhorn, 2003). The magnitude of surface cooling differs largely depending on the degree of stratification on the right-hand side of the cyclone track (Jacob and Shay, 2003;Price, 1981).…”

Section: Introductionmentioning

confidence: 99%

Revised Manuscript with track changes

Pant¹

2018

Preprint

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A coupled atmosphere-ocean-wave model was used to examine mixing in the upper-oceanic layers under the influence of a very severe cyclonic storm Phailin over the Bay of Bengal (BoB) during 10-14 October 2013. The coupled model was found to improve the sea surface temperature over the uncoupled model. Model simulations highlight the prominent role of cyclone-induced near-inertial oscillations in subsurface mixing up to the thermocline depth. The inertial mixing introduced by the cyclone played a central role in the deepening of the thermocline and mixed layer depth by 40 and 15 m, respectively. For the first time over the BoB, a detailed analysis of inertial oscillation kinetic energy generation, propagation, and dissipation was carried out using an atmosphere-ocean-wave coupled model during a cyclone. A quantitative estimate of kinetic energy in the oceanic water column, its propagation, and its dissipation mechanisms were explained using the coupled atmosphere-ocean-wave model. The large shear generated by the inertial oscillations was found to overcome the stratification and initiate mixing at the base of the mixed layer. Greater mixing was found at the depths where the eddy kinetic diffusivity was large. The baroclinic current, holding a larger fraction of kinetic energy than the barotropic current, weakened rapidly after the passage of the cyclone. The shear induced by inertial oscillations was found to decrease rapidly with increasing depth below the thermocline. The dampening of the mixing process below the thermocline was explained through the enhanced dissipation rate of turbulent kinetic energy upon approaching the thermocline layer. The wave-current interaction and nonlinear wave-wave interaction were found to affect the process of downward mixing and cause the dissipation of inertial oscillations.

show abstract

A study on some basic features of inertial oscillations and near-inertial internal waves

Cited by 14 publications

References 25 publications

Correlation of Near-Inertial Wind Stress in Typhoon and Typhoon-Induced Oceanic Near-Inertial Kinetic Energy in the Upper South China Sea

Correlation of Near-Inertial Wind Stress in Typhoon and Typhoon-Induced Oceanic Near-Inertial Kinetic Energy in the Upper South China Sea

Estimation of oceanic subsurface mixing under a severe cyclonic storm using a coupled atmosphere–ocean–wave model

Revised Manuscript with track changes

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