scholarly journals Shifting seasonality of cyclones and western boundary current interactions in Bay of Bengal as observed during Amphan and Fani

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sourav Sil ◽  
Avijit Gangopadhyay ◽  
Glen Gawarkiewicz ◽  
Saikat Pramanik
Keyword(s):  
Bay Of Bengal ◽  
Quantitative Model ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current ◽  
Cyclonic Storm ◽  
Heat Potential ◽  
Tropical Depressions ◽  
Along Track ◽  
The Impact

AbstractIn recent years, the seasonal patterns of Tropical Cyclones (TC) in the Bay of Bengal have been shifting. While tropical depressions have been common in March–May (spring), they typically have been relatively weaker than the TCs during October–December. Here we show that the spatial pattern of recent warming trends during the last two decades in the southwestern Bay has allowed for stronger springtime pre-monsoon cyclones such as Amphan (May 2020, Super Cyclone) and Fani (April–May 2019, Extremely Severe Cyclone). The tracks of the pre-monsoon cyclones shifted westward, concurrent with an increasing rate of warming. This shift allowed both Fani and Amphan tracks to cross the northeastward warm Western Boundary Current (WBC) and associated warm anti-cyclonic eddies, while the weaker Viyaru (April 2013, Cyclonic Storm) did not interact with the WBC. A quantitative model linking the available along-track heat potential to cyclone’s intensity is developed to understand the impact of the WBC on cyclone intensification. The influence of the warming WBC and associated anti-cyclonic eddies will likely result in much stronger springtime TCs becoming relatively common in the future.

scholarly journals On the nature of meandering of the springtime western boundary current in the Bay of Bengal

2013 ◽  
Vol 40 (10) ◽  
pp. 2188-2193 ◽  
Author(s):  
Avijit Gangopadhyay ◽  
G. N. Bharat Raj ◽  
Ayan H. Chaudhuri ◽  
M. T. Babu ◽  
Debasis Sengupta
Keyword(s):  
Bay Of Bengal ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current

Characteristics of the Discontinuity of Western Boundary Current in the Bay of Bengal

2019 ◽  
Vol 124 (7) ◽  
pp. 4464-4479 ◽  
Author(s):  
Bijan Kumar Das ◽  
T.S. Anandh ◽  
J. Kuttippurath ◽  
Arun Chakraborty
Keyword(s):  
Bay Of Bengal ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current

The western boundary current of the seasonal subtropical gyre in the Bay of Bengal

1993 ◽  
Vol 98 (C1) ◽  
pp. 945-954 ◽  
Author(s):  
S. R. Shetye ◽  
A. D. Gouveia ◽  
S. S. C. Shenoi ◽  
D. Sundar ◽  
G. S. Michael ◽  
...  
Keyword(s):  
Bay Of Bengal ◽  
Western Boundary Current ◽  
Subtropical Gyre ◽  
Western Boundary ◽  
Boundary Current

Influence of River Discharge and Tides on the Summertime Discontinuity of Western Boundary Current in the Bay of Bengal

2020 ◽  
Vol 50 (12) ◽  
pp. 3513-3528
Author(s):  
Bijan Kumar Das ◽  
T. S. Anandh ◽  
J. Kuttippurath ◽  
Arun Chakraborty
Keyword(s):  
Boundary Conditions ◽  
Summer Monsoon ◽  
Bay Of Bengal ◽  
River Discharge ◽  
Western Boundary Current ◽  
Upper Ocean ◽  
Western Boundary ◽  
Boundary Current ◽  
Tidal Forcing ◽  
River Input

AbstractThe East India Coastal Current (EICC), the western boundary current (WBC) in the Bay of Bengal (BOB), is continuous and well directed during pre- and postmonsoon season but is discontinuous during summer monsoon season (June–September). This study examines the individual and combined effects of river discharge and tidal forcing on the EICC discontinuity using high-resolution (1/12°) Regional Ocean Modeling System simulations. Four climatological experiments, a control simulation with normal boundary conditions and three other sensitivity simulations with the same boundary conditions but with river input, tidal forcing, and both together, are conducted. The analysis shows that, during summer monsoon, the southward reversal of EICC from head bay is enhanced with the river input while the tide forcing strengthens the northward EICC from north of Sri Lanka. High horizontal-salinity-gradient flow in the stratified upper ocean caused by the river discharge increases the surface currents. High vertical mixing in tide forcing suppresses the surface features. The strong horizontal diffusivity due to river discharge promotes the eddy genesis and propagation throughout the western BOB. Conversely, tidal oscillation contributes high turbulent buoyancy, which makes the upper ocean relatively unstable, and the discontinuity remains confined to the western boundary. The combined-forcing simulation indicates the dominance of river discharge in the upper layers with suppressed surface features due to tides, which intensify the discontinuity at subsurface. Therefore, the results of this numerical study suggest that the river input and tidal forcing both play important and complementary roles in maintaining the realistic summertime discontinuity in the BOB.

Structure and dynamics of undercurrents in the western boundary current of the Bay of Bengal

2020 ◽  
Vol 70 (3) ◽  
pp. 387-404 ◽  
Author(s):  
Pavanathara Augustine Francis ◽  
Abraham Kaduvathazham Jithin ◽  
Abhisek Chatterjee ◽  
Arnab Mukherjee ◽  
Doraiswamy Shankar ◽  
...  
Keyword(s):  
Bay Of Bengal ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current ◽  
Structure And Dynamics

Signature of Indian Ocean Dipole on the western boundary current of the Bay of Bengal

2018 ◽  
Vol 136 ◽  
pp. 91-106 ◽  
Author(s):  
V.R. Sherin ◽  
F. Durand ◽  
V.V. Gopalkrishna ◽  
S. Anuvinda ◽  
A.V.S. Chaitanya ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Bay Of Bengal ◽  
Indian Ocean Dipole ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current

scholarly journals A Quality Control Procedure for Climatological Studies Using Argo Data in the North Pacific Western Boundary Current Region

2016 ◽  
Vol 33 (12) ◽  
pp. 2717-2733 ◽  
Author(s):  
Wenjing Jia ◽  
Dong Wang ◽  
Nadia Pinardi ◽  
Simona Simoncelli ◽  
Andrea Storto ◽  
...  
Keyword(s):  
Quality Control ◽  
North Pacific ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Control Procedure ◽  
Boundary Current ◽  
The North ◽  
Current Region ◽  
The Impact ◽  
The North Pacific

AbstractA quality control (QC) procedure is developed to estimate monthly mean climatologies from the large Argo dataset (2005–12) over the North Pacific western boundary current region. In addition to the individual QC procedure, which checks for instrumental, transmission, and gross errors, the paper describes and shows the impact of climatological checks (collective QC) on the quality of both processed profiles and resultant climatological distributions. Objective analysis (OA) is applied progressively to produce the gridded climatological fields. The method uses horizontal regional climatological averages defined in five regime-oriented subregions in the Kuroshio area and the Japan Sea. Performing the QC procedure on specific coherent subregions produces improved profiling data and climatological fields because more details about the local hydrodynamics are taken into consideration. Nonrepresentative data and random noises are more effectively rejected by this method, which has value both in defining a climatological mean and identifying outlier data. Assessing with both profiling and coordinated datasets, the agreement is reasonably good (particularly for those areas with abundant observations), but the results (although already smoothed) can capture more detailed or mesoscale features for further regional studies. The method described has the potential to meet future challenges in processing accumulating Argo observations in the coming decades.

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