Eddy‐Induced Transport and Kinetic Energy Budget in the Arabian Sea

Zhan, Peng; Guo, Daquan; Hoteit, Ibrahim

doi:10.1029/2020gl090490

Cited by 15 publications

(14 citation statements)

References 69 publications

(138 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the AS, strong eddy energy emerges in the SC region during the summer monsoon under the drive of northward SC, which is concluded by previous studies (Chen et al, 2014;Zhan et al, 2020). The largest EKE/EPE locates in the GW region, and the large energy region gradually proceeds northward with the moving GW.…”

Section: Seasonal Variation Of Eddy Kinetic Energy and Eddy Potential...supporting

confidence: 61%

“…Modulated by the inverted wind and currents (Figure 1), the eddy energy has distinct seasonal variation in the north Indian Ocean. In the Arabian Sea (AS), the Great Whirl (GW) generates under the driving of summer monsoon wind (Beal and Donohue, 2013;Vic et al, 2014), producing enormous EKE in the Somali Current (SC) region (Zhan et al, 2020). Then, the GW propagates northward and collides with Socotra Island, splitting into several small eddies and the Socotra Eddy (Fischer et al, 1996;Akuetevi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In the eastern AS, the cyclonic Laccadive Low emerges in the Laccadive Sea, which is induced by local and remote wind forcing (Bruce et al, 1994;Shankar and Shetye, 1997), while the anticyclonic Laccadive High takes its place in winter. As the SC and EAC reverse during the winter monsoon, their intensities also drop, producing less eddy energy than summer (Zhan et al, 2020). During this period, eddies may propagate into the Gulf of Aden under the driving of Rossby waves and southwestward EAC, thus enhancing the energy inside the gulf (Al Saafani et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal variability of eddy kinetic energy in the north Indian Ocean

et al. 2022

View full text Add to dashboard Cite

The seasonality of eddy kinetic energy (EKE) is analyzed in the north Indian Ocean by adopting high-resolution ocean reanalysis data. Significant eddy energy can be mainly spotted in six regions, including the Somali Current (SC) region, the Gulf of Aden, the Laccadive Sea, the east of Sri Lanka, the East Indian Coastal Current (EICC) region, and the northwest of Sumatra. As the most energetic region, the EKE averaged above 200 m could exceed 0.15 m2·s-2 in the SC region, whereas the mean EKE above 200 m is less than 0.04 m2·s-2 in the other regions. The barotropic and baroclinic instabilities are vital to eddy energy, and the contribution of each term in the barotropic/baroclinic equations varies with season and region. In the SC region and EICC region, EKE is primarily generated by barotropic conversion due to the sharp velocity shear caused by the strong SC during the summer monsoon and the EICC from March to June. For the other regions, the leading source of EKE is the eddy potential energy (EPE), which is extracted from available potential energy of mean flow via baroclinic conversion, and then the EPE is converted into EKE through vertical density flux. Once generated, EKE will be redistributed by pressure work and advection via eddy energy flux, which varies in sync with the monthly variation of total EKE, transporting EKE to the adjacent region or deeper layer. From the vertical aspect, eddy energy conversions are more prominent above 200 m. The maximal EKE and barotropic conversion mostly occur at the surface, whereas the EPE and baroclinic conversion may have two peaks, which lie at the surface and in the thermocline. Using the satellite altimeter data and wind data, we further investigate the impact of geostrophic eddy wind work, which reveals a slightly dampening effect to EKE in the north Indian Ocean.

show abstract

Section: Seasonal Variation Of Eddy Kinetic Energy and Eddy Potential...supporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Seasonal variability of eddy kinetic energy in the north Indian Ocean

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The general circulation in this basin is clockwise in summer and anticlockwise in winter [25], and it exhibits remarkable seasonal variability driven by the Indian monsoon system [26,27]. The eddy-induced swirl transport is larger in the western Arabian Sea and tends to compensate for heat transport by the mean flow [28]. The two gulfs in the north connect and exchange water properties with the Arabian Sea through two straits [29].…”

Section: Introductionmentioning

confidence: 99%

Seasonal M2 Internal Tides in the Arabian Sea

Guo

Zhan

et al. 2021

Remote Sensing

Self Cite

View full text Add to dashboard Cite

Internal tides play a crucial role in ocean mixing. To explore the seasonal features of mode-1 M2 internal tides in the Arabian Sea, we analyzed their propagation and energy distribution using along-track sea-level anomaly data collected by satellite altimeters. We identified four primary source regions of internal tides: Abd al Kuri Island, the Carlsberg Ridge, the northeastern Arabian Sea, and the Maldive Islands. The baroclinic signals that originate from Abd al Kuri Island propagate meridionally, whereas those originating from the west coast of India propagate southwestward. The strength and energy flux of the internal tides in the Arabian Sea exhibit significant seasonal and spatial variability. The internal tides generated during winter are more energetic and can propagate further than those generated in summer. Doppler shifting and horizontal variations in stratification can explain the differences in the internal tides’ seasonal distributions.

show abstract

“…The sea has a relatively independent circulation system (Yao et al, 2014a;Yao et al, 2014b), making it an ideal basin for investigating the influence of tides on the basin's general circulations. The Red Sea spans an area of approximately 20°in latitude (from 10°N to 30°N) and approximately 10°in longitude (from 32°E to 42°E), which enables the development of a complete and composite circulation system of different scales, including the Gulf of Aden Intermediate Water (GAIW) intrusion , the deep water formation event in the north (Yao and Hoteit, 2018), a strong mesoscale eddy activity (Zhan et al, 2014;Zhan et al, 2018;Zhan et al, 2020), and small-scale internal solitary waves (ISWs) in the southern Red Sea (Guo et al, 2016;Guo et al, 2021). The relatively small size of the Red Sea basin enables the implementation of a highresolution numerical model capable of resolving small-scale processes such as baroclinic tides (Guo et al, 2018).…”

mentioning

confidence: 99%

Hindrance effect of tides on water exchanges between the Red Sea and the Gulf of Aden

et al. 2022

Self Cite

View full text Add to dashboard Cite

As a semienclosed marginal sea, the Red Sea connects with the open ocean through a narrow strait at its southern end, known as the Bab-al-Mandeb (BAM) strait. The water exchange between the Red Sea and the Gulf of Aden at the BAM strait is crucial for the water mass transformations and thermohaline circulation in the Red Sea as well as for nutrient supply to the open ocean. In this study, a three-dimensional high-resolution nonhydrostatic MIT general circulation model (MITgcm) was used to investigate the tidal influence on the water exchange in the BAM strait through simulations with and without tidal forcing. We found that the tidal effects on the water exchange in winter were insignificant; however, the summer intrusion of the Gulf of Aden Intermediate Water (GAIW) was strongly affected. When the simulation includes tidal forcing, the along-axis northern extension of the GAIW intrusion is reduced by u to 100 km and the monthly mean volume transport is decreased by 20% on average. Two actors that possibly contribute to the hindrance effects of tides in summer are (i) the tidal residual currents that propagate in a direction opposite to the pathway of the GAIW intrusion currents nd (ii) the enhanced vertical mixing at the pycnocline and near the benthic topography of the BAM strait, which triggers more instabilities along the pathway of the intrusion.

show abstract

Eddy‐Induced Transport and Kinetic Energy Budget in the Arabian Sea

Cited by 15 publications

References 69 publications

Seasonal variability of eddy kinetic energy in the north Indian Ocean

Seasonal variability of eddy kinetic energy in the north Indian Ocean

Seasonal M2 Internal Tides in the Arabian Sea

Hindrance effect of tides on water exchanges between the Red Sea and the Gulf of Aden

Contact Info

Product

Resources

About