scholarly journals Shear Flow Instabilities and Unstable Events Over the North Bay of Bengal

2018 ◽  
Vol 123 (12) ◽  
pp. 8958-8969 ◽  
Author(s):  
Venkata Jampana ◽  
M. Ravichandran ◽  
Debasis Sengupta ◽  
E. A. D'Asaro ◽  
Hasibur Rahaman ◽  
...  
Keyword(s):  
Shear Flow ◽  
Bay Of Bengal ◽  
Flow Instabilities ◽  
The North

scholarly journals Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments

2013 ◽  
Vol 9 (5) ◽  
pp. 2135-2151 ◽  
Author(s):  
C. Marzin ◽  
N. Kallel ◽  
M. Kageyama ◽  
J.-C. Duplessy ◽  
P. Braconnot
Keyword(s):  
North Atlantic ◽  
Bay Of Bengal ◽  
Indian Monsoon ◽  
Hydrological Cycle ◽  
Atlantic Meridional Overturning Circulation ◽  
Meridional Overturning Circulation ◽  
The North ◽  
North Atlantic Climate ◽  
Meridional Overturning ◽  
The North Atlantic

Abstract. Several paleoclimate records such as from Chinese loess, speleothems or upwelling indicators in marine sediments present large variations of the Asian monsoon system during the last glaciation. Here, we present a new record from the northern Andaman Sea (core MD77-176) which shows the variations of the hydrological cycle of the Bay of Bengal. The high-resolution record of surface water δ18O dominantly reflects salinity changes and displays large millennial-scale oscillations over the period 40 000 to 11 000 yr BP. Their timing and sequence suggests that events of high (resp. low) salinity in the Bay of Bengal, i.e. weak (resp. strong) Indian monsoon, correspond to cold (resp. warm) events in the North Atlantic and Arctic, as documented by the Greenland ice core record. We use the IPSL_CM4 Atmosphere-Ocean coupled General Circulation Model to study the processes that could explain the teleconnection between the Indian monsoon and the North Atlantic climate. We first analyse a numerical experiment in which such a rapid event in the North Atlantic is obtained under glacial conditions by increasing the freshwater flux in the North Atlantic, which results in a reduction of the intensity of the Atlantic meridional overturning circulation. This freshwater hosing results in a weakening of the Indian monsoon rainfall and circulation. The changes in the continental runoff and local hydrological cycle are responsible for an increase in salinity in the Bay of Bengal. This therefore compares favourably with the new sea water δ18O record presented here and the hypothesis of synchronous cold North Atlantic and weak Indian monsoon events. Additional sensitivity experiments are produced with the LMDZ atmospheric model to analyse the teleconnection mechanisms between the North Atlantic and the Indian monsoon. The changes over the tropical Atlantic are shown to be essential in triggering perturbations of the subtropical jet over Africa and Eurasia, that in turn affect the intensity of the Indian monsoon. These relationships are also found to be valid in additional coupled model simulations in which the Atlantic meridional overturning circulation (AMOC) is forced to resume.

scholarly journals Stratified shear flow instabilities in the non-Boussinesq regime

2015 ◽  
Vol 27 (8) ◽  
pp. 086601 ◽  
Author(s):  
E. Heifetz ◽  
J. Mak
Keyword(s):  
Shear Flow ◽  
Flow Instabilities ◽  
Stratified Shear Flow

Reinvigoration of BIMSTEC and India’s Economic, Strategic and Security Concerns

2020 ◽  
Vol 11 (2) ◽  
pp. 187-210
Author(s):  
Suneel Kumar
Keyword(s):  
South Asian ◽  
Economic Integration ◽  
Bay Of Bengal ◽  
Regional Cooperation ◽  
Eastern Region ◽  
Asian Countries ◽  
The North ◽  
North Eastern ◽  
Security Concerns ◽  
Bilateral Differences

This article contends that India’s efforts for the reinvigoration of the Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation (BIMSTEC) are the result of an amalgam of its Act East and Neighbourhood First policies’ objectives. Since 2014, India has been trying to rejuvenate the BIMSTEC to exploit the untapped trade opportunities, promote energy and food security and also boost the development of its North Eastern region by enhancing infrastructural connectivity with South East Asian countries and promoting greater economic integration in the Bay of Bengal region. Its strategic interests and security concerns, especially to build the pressure on Pakistan, counter China’s forays into its strategic backyard and ensure the security of the North Eastern region, have also resurged India’s interests in the revival of BIMSTEC. Like South Asian Association for Regional Cooperation (SAARC), there are some hurdles in the way of BIMSTEC, for instance its image of an India-dominated bloc, India’s bilateral differences with other BIMSTEC countries from South Asia, especially with Bangladesh and Nepal, and bilateral disputes between other member countries, particularly Bangladesh and Myanmar and Thailand and Myanmar.

scholarly journals XII. Some anomalies in the winds of Northern India, and their relation to the distribution of barometric pressure

1887 ◽  
Vol 178 ◽  
pp. 335-378 ◽  
Keyword(s):  
Sea Level ◽  
Bay Of Bengal ◽  
Barometric Pressure ◽  
Diurnal Variations ◽  
Annual Reports ◽  
General Review ◽  
Northern India ◽  
The North ◽  
North Western ◽  
Made In

In the 13 years which have elapsed since Mr. Blanford published his paper on the Winds of Northern India, very great additions have been made to our knowledge of the meteorology of the country. The carefully organised system of observations, commenced in Bengal and the North-Western Provinces, has been extended to include the whole of India, and placed under the direction of Mr. Blanford himself, aided by local officers in all the larger provinces. Verified instruments have been supplied to all the stations, and the elevations of these above sea-level have been determined by connecting them with the lines of spirit-levelling, carried inland from the coast, in various directions, by the officers of the Great Trigonometrical Survey; or, where this was impracticable, by spirit-levelling to some of the trigonometrical stations of the Survey. In this way, trust worthy and intercomparable series of barometric observations, extending over ten years or more, have been obtained for all the more important stations. At the same time, the diurnal variations of the barometer at certain selected stations have been determined by long-continued series of hourly observations, with the object of enabling us to reduce the readings made in the ordinary way (usually at 10 a. m. and 4 p. m.) to time daily means. Simultaneously with the collection of this immense quantity of accurate and reliable barometric data, observations have been made of temperature, humidity, cloud, wind, and rain. Latterly also barometric and wind charts of the Bay of Bengal have been prepared from observations made on board ships navigating those waters. During these 13 years, the winds prevailing over the Indian continent and the Bay of Bengal, and their relations to the distribution of pressure at sea-level, have been discussed from time to time, both in their normal aspects for each month or season and in their abnormal or disturbed conditions during the passage of storms. The latter conditions in particular have been very fully described by Mr. Eliot in his numerous reports on cyclones in the Bay of Bengal, while the former have been noticed in the annual reports on the meteorology of India, in occasional papers appearing in the ‘Indian Meteorological Memoirs,' and latterly in a broad and general review in Mr. Blanford’s great monograph on the Rainfall of India.

A Commentary on Maritime Boundary Arbitration between Bangladesh and India Concerning the Bay of Bengal

2015 ◽  
Vol 28 (4) ◽  
pp. 799-848 ◽  
Author(s):  
MARCIN KAŁDUŃSKI
Keyword(s):  
Continental Shelf ◽  
Bay Of Bengal ◽  
Careful Examination ◽  
The North ◽  
Grey Area ◽  
Maritime Boundary ◽  
Relevant Circumstance ◽  
The Creation ◽  
The Law ◽  
The Impact

AbstractThis article considers the law of maritime delimitation as applied by the Arbitral Tribunal in the 2014 Bangladesh v. India case. The dispute concerned the delimitation of the maritime boundary between the two states in the north-eastern part of the Bay of Bengal. The Tribunal's Award covers several important issues which require careful examination, such as the land boundary terminus, the delimitation methodology, the role of objectivity, predictability and transparency in maritime delimitation, and the impact of the established case law on the present delimitation procedures. The commentary analyses the Award from the viewpoint of the law of maritime delimitation and traces how the Tribunal applied and developed the methodology used in maritime delimitation. The key points where the Award advances the law of the sea concern the concavity of the coast as a relevant circumstance and the creation of grey area. The Tribunal made significant pronouncements on the continental shelf, especially, beyond 200 nm. It confirmed the concept of a single continental shelf and reasoned that legal regimes of the EEZ and the continental shelf are independent and separable. However, the creation of another grey area met with strong disagreement from Dr Rao. The author considers the Award and the Dissenting Opinion to argue that the adjustment of the equidistance line raises certain concerns and that the creation of grey area is permissible under UNCLOS.

Enhanced double-diffusive salt flux from the high-salinity core of Arabian Sea origin waters to the Bay of Bengal

2020 ◽  
Author(s):  
Jenson V. George ◽  
P.N. Vinayachandran ◽  
Anoop A. Nayak
Keyword(s):  
Bay Of Bengal ◽  
Arabian Sea ◽  
High Salinity ◽  
Saline Water ◽  
North Indian Ocean ◽  
Salt Flux ◽  
High Salinity Water ◽  
The North ◽  
Salt Fingering ◽  
Double Diffusive

AbstractThe inflow of high saline water from the Arabian Sea (AS) into the Bay of Bengal (BoB) and its subsequent mixing with the relatively fresh BoB water is vital for the North Indian Ocean salt budget. During June–September, Summer Monsoon Current carries high salinity water from the AS to the BoB. A time series of microstructure and hydrographic data collected from 4–14 July 2016 in the Southern BoB (8°N, 89°E) showed the presence of subsurface (60–150 m) high-salinity core. The high-salinity core was comprised of relatively warm and saline AS water overlying the relatively cold and fresh BoB water. Lower part of the high-salinity core showed double-diffusive salt fingering instability. Salt fingering staircases with varying thickness (up to 10 m) in the temperature and salinity profiles were also observed at the base of high-salinity core at approximately 75–150 m depth. The average downward diapycnal salt flux out of the high salinity core due to the effect of salt fingering was 2.8×10−7 kg m−2 s−1; approximately one order of magnitude higher than the flux if salt fingering were neglected.

Shear flow instabilities induced by trapped ion modes in collisionless temperature gradient turbulence

2015 ◽  
Vol 22 (4) ◽  
pp. 042304 ◽  
Author(s):  
F. Palermo ◽  
X. Garbet ◽  
A. Ghizzo ◽  
T. Cartier-Michaud ◽  
P. Ghendrih ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Shear Flow ◽  
Flow Instabilities ◽  
Trapped Ion
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