Observations of Currents Over the Deep Southern Bay of Bengal—With a Little Luck

Wijesekera, H. W.; Teague, William J.; Jarosz, Ewa; Wang, David; Jensen, Tommy G.; Jinadasa, S.U.P.; Fernando, H. J. S.; Centurioni, Luca; Hallock, Zachariah R.; Moum, James N.

doi:10.5670/oceanog.2016.44

Cited by 15 publications

(13 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has a propagation speed of 12 cm s −1 , in good agreement with the phase speed of a mode 2 baroclinic Rossby wave in this region Killworth and Blundell, 2003;Wijesekera et al, 2016a). A westward-propagating signal first develops at the eastern boundary of the BoB in April-May at the same time that the Wyrtki Jet, a surface-intensified eastwardflowing current observed in the equatorial Indian Ocean during the monsoon transitions (Wyrtki, 1973), reaches this eastern boundary.…”

Section: Springsupporting

confidence: 70%

An undercurrent off the east coast of Sri Lanka

et al. 2017

View full text Add to dashboard Cite

Abstract. The existence of a seasonally varying undercurrent along 8 • N off the east coast of Sri Lanka is inferred from shipboard hydrography, Argo floats, glider measurements, and two ocean general circulation model simulations. Together, they reveal an undercurrent below 100-200 m flowing in the opposite direction to the surface current, which is most pronounced during boreal spring and summer and switches direction between these two seasons. The volume transport of the undercurrent (200-1000 m layer) can be more than 10 Sv in either direction, exceeding the transport of 1-6 Sv carried by the surface current (0-200 m layer). The undercurrent transports relatively fresher water southward during spring, while it advects more saline water northward along the east coast of Sri Lanka during summer. Although the undercurrent is potentially a pathway of salt exchange between the Arabian Sea and the Bay of Bengal, the observations and the ocean general circulation models suggest that the salinity contrast between seasons and between the boundary current and interior is less than 0.09 in the subsurface layer, suggesting a small salt transport by the undercurrent of less than 4 % of the salinity deficit in the Bay of Bengal.

show abstract

Section: Springsupporting

confidence: 70%

An undercurrent off the east coast of Sri Lanka

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Local fishing vessels picked up a significant number of drifters shortly after deployment, resulting in shortened missions. Nonetheless, the surviving drifters unveiled new circulation pathways and provided observations for evaluating numerical ocean circulation models (Wijesekera et al, 2015(Wijesekera et al, , 2016, in this issue).…”

Section: Research Vesselsmentioning

confidence: 96%

“…The moored array sampled for 20 months, capturing two winter and two summer monsoons. Wijesekera et al (2016, in this issue) report findings from the mooring array.…”

Section: Mooringsmentioning

confidence: 97%

See 1 more Smart Citation

Collaborative Observations of Boundary Currents, Water Mass Variability, and Monsoon Response in the Southern Bay of Bengal

Lee¹,

Jinadasa²,

Anutaliya³

et al. 2016

Oceanog

Self Cite

View full text Add to dashboard Cite

“…Cyclones during the post-monsoon months of October and November can drive a hundredfold increase in near-surface mixing both locally and throughout the Bay (Warner et al 2016). Mixing profiles collected by a fast thermistor on a CTD rosette during a basin-wide survey before and after the passage of cyclone Madi (6-12 Dec, 2013) show a basin-wide increase in diffusivity linked to near-inertial waves forced by the cyclone (Wijesekera et al, 2016b). The influence of freshwater is a critical caveat to the above generalizations: the arrival in August of the Ganga-Brahmaputra-Meghna freshwater plume at 18°N has been observed to suppress turbulence (diffusivity KT < 10 -5 m² s -1 ) for multiple months (Aug-Nov) at depths of approximately 50-65 m (Figure 20).…”

Section: Vertical Mixingmentioning

confidence: 99%

Progress in understanding of Indian Ocean circulation, variability, air-sea exchange and impacts on biogeochemistry

Phillips

Tandon

Furue

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Over the past decade, our understanding of the Indian Ocean has advanced through concerted efforts toward measuring the ocean circulation and its water properties, detecting changes in water masses, and linking physical processes to ecologically important variables. New circulation pathways and mechanisms have been discovered, which control atmospheric and oceanic mean state and variability. This review brings together new understanding of the ocean-atmosphere system in the Indian Ocean since the last comprehensive review, describing the Indian Ocean circulation patterns, air-sea interactions and climate variability. The second International Indian Ocean Expedition (IIOE-2) and related efforts have motivated the application of new technologies to deliver higher-resolution observations and models of Indian Ocean processes. As a result we are discovering the importance of small scale processes in setting the large-scale gradients and circulation, interactions between physical and biogeochemical processes, interactions between boundary currents and the interior, and between the surface and the deep ocean. In the last decade we have seen rapid warming of the Indian Ocean overlaid with extremes in the form of marine heatwaves. These events have motivated studies that have delivered new insight into the variability in ocean heat content and exchanges in the Indian Ocean, and climate variability on interannual to decadal timescales.This synthesis paper reviews the advances in these areas in the last decade.

show abstract

Observations of Currents Over the Deep Southern Bay of Bengal—With a Little Luck

Abstract: Observations of currents over the deep southern Bay of Bengal-with a little luck.Oceanography 29(2):112-123, http://dx.doi.org/10.5670/oceanog.2016.44.

Cited by 15 publications

References 37 publications

An undercurrent off the east coast of Sri Lanka

An undercurrent off the east coast of Sri Lanka

Collaborative Observations of Boundary Currents, Water Mass Variability, and Monsoon Response in the Southern Bay of Bengal

Progress in understanding of Indian Ocean circulation, variability, air-sea exchange and impacts on biogeochemistry

Contact Info

Product

Resources

About