scholarly journals Dominant role of winds near Sri Lanka in driving seasonal sea level variations along the west coast of India

2016 ◽  
Vol 43 (13) ◽  
pp. 7028-7035 ◽  
Author(s):  
I. Suresh ◽  
J. Vialard ◽  
T. Izumo ◽  
M. Lengaigne ◽  
W. Han ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Sea Level ◽  
West Coast ◽  
Dominant Role ◽  
The West ◽  
West Coast Of India ◽  
Sea Level Variations

Sea Level Variations Associated with Upwelling/ Downwelling Along the West Coast of India

2001 ◽  
Vol 24 (3) ◽  
pp. 153-170 ◽  
Author(s):  
A. D. Rao ◽  
S. V. Babu ◽  
Madhu Sharma
Keyword(s):  
Sea Level ◽  
West Coast ◽  
The West ◽  
West Coast Of India ◽  
Sea Level Variations

Importance of wind variations and intersecting waveguides near Sri Lanka for the intraseasonal sea level variability along the west coast of India

2020 ◽  
Author(s):  
Iyyappan Suresh ◽  
Jerome Vialard ◽  
Matthieu Lengaigne ◽  
Takeshi Izumo ◽  
Muraleedharan Pillathu Moolayil
Keyword(s):  
Sri Lanka ◽  
Indian Ocean ◽  
Sea Level ◽  
Bay Of Bengal ◽  
West Coast ◽  
Equatorial Indian Ocean ◽  
Direct Connection ◽  
Local Wind ◽  
The West ◽  
Eastern Equatorial Indian Ocean

<p>Remote wind forcing plays a strong role in the Northern Indian Ocean, where oceanic anomalies can travel long distances within the coastal waveguide. Previous studies for instance emphasized that remote equatorial forcing is the main driver of the sea level and currents intraseasonal variability along the west coast of India (WCI). Until now, the main pathway for this connection between the equatorial and coastal waveguides was thought to occur in the eastern equatorial Indian Ocean, through coastal Kelvin waves that propagate around the Bay of Bengal rim and then around Sri Lanka to the WCI. Using a linear, continuously stratified ocean model, the present study demonstrates that two other mechanisms in fact dominate. First, the equatorial waveguide also intersects the coastal waveguide at the southern tip of India and Sri Lanka, creating a direct connection between the equator and WCI. Rossby waves reflected from the eastern equatorial Indian Ocean boundary indeed have a sufficiently wide meridional scale to induce a pressure signal at the Sri Lankan coast, which eventually propagates to the WCI as a coastal Kelvin wave. Second, local wind variations in the vicinity of Sri Lanka generate strong intraseasonal signals, which also propagate to the WCI along the same path. Sensitivity experiments indicate that these two new mechanisms (direct equatorial connection and local wind variations near Sri Lanka) dominate the WCI intraseasonal sea level variability, with the “classical” pathway around the Bay of Bengal only coming next. Other contributions (Bay of Bengal forcing, local WCI forcing) are much weaker.</p><p>We further show that the direct connection between the equatorial waveguide and WCI is negligible at seasonal timescale, but not at interannual timescales where it contributes to the occurrence of anoxic events. By providing an improved understanding of the mechanisms that control the WCI thermocline and oxycline variability, our results could have socio-economic implications for regional fisheries and ecosystems.</p>

scholarly journals Sea Level Interannual Variability Along the West Coast of India

2018 ◽  
Vol 45 (22) ◽  
pp. 12,440-12,448 ◽  
Author(s):  
I. Suresh ◽  
J. Vialard ◽  
M. Lengaigne ◽  
T. Izumo ◽  
V. Parvathi ◽  
...  
Keyword(s):  
Interannual Variability ◽  
Sea Level ◽  
West Coast ◽  
The West ◽  
West Coast Of India

Sea level changes induced by local winds on the west coast of India

2010 ◽  
Vol 60 (4) ◽  
pp. 819-833 ◽  
Author(s):  
Prakash Mehra ◽  
Michael N. Tsimplis ◽  
R. G. Prabhudesai ◽  
Antony Joseph ◽  
Andrew G. P. Shaw ◽  
...  
Keyword(s):  
Sea Level ◽  
West Coast ◽  
Sea Level Changes ◽  
The West ◽  
West Coast Of India ◽  
Local Winds

scholarly journals First report of Lactoria cornuta from the west coast of India, Evidence of the role of tropical cyclone Ockhi

2021 ◽  
Author(s):  
Dr Muhammed Zafar Iqbal Abdul Rahim Navalgund ◽  
Gurudev I Mali ◽  
Raghavendra I Dollin
Keyword(s):  
Endemic Species ◽  
Bay Of Bengal ◽  
West Coast ◽  
Fish Diversity ◽  
The West ◽  
West Coast Of India ◽  
Successful Establishment ◽  
External Forces ◽  
First Time

India is known for its rich biodiversity and is fortunate to have several endemic species from different classes of vertebrates. India is home to 7.5% of the global fish diversity, with 91 endemic species of ray finned fishes, the actinopterygians. Some fish species have never been reported until recently, and one such example is the long-horned Cowfish (Ostracidae), best known for inhabiting only certain areas of the Indo-Pacific oceans. However, it has been reported recently in the Bay of Bengal, but never on the west coast of India. This is the first time this fish has been found on the west coast of India. Given its morphology, the migration seems highly improbable since it can only endure lethargic swimming. In this article, we have explored the role of other external forces that could have contributed to its journey to the west coast of India. As such, we recognize the role of Super Cyclone Ockhi as a vital force in determining the expansion of its range. The fact that its first collection coincides with the passage of Cyclone Ockhi on the west coast of India greatly supports our hypothesis. A year later, another specimen was recovered from a location very close to the first, indicating the successful establishment of Lacturia cornuta in its new environment. Related morphometric and meristic studies of our specimens are consistent with previous studies reported in the Bay of Bengal.

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