Tropical Cyclones over the Arabian Sea during the monsoon onset phase

2021 ◽  
Author(s):  
Shreyas Dhavale ◽  
Milind Mujumdar ◽  
M.K. Roxy ◽  
Vineet Kumar Singh
Keyword(s):  
Tropical Cyclones ◽  
Arabian Sea ◽  
Monsoon Onset ◽  
Onset Phase

scholarly journals On the Detection of Onset and Activity of the Indian Summer Monsoon Using GPS RO Refractivity Profiles

2013 ◽  
Vol 141 (6) ◽  
pp. 2096-2106 ◽  
Author(s):  
V. V. M. Jagannadha Rao ◽  
M. Venkat Ratnam ◽  
Y. Durga Santhi ◽  
M. Roja Raman ◽  
M. Rajeevan ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Arabian Sea ◽  
Active Phase ◽  
Monsoon Onset ◽  
Tropospheric Temperature ◽  
Sudden Increase ◽  
Atmospheric Conditions ◽  
Good Relation ◽  
Onset Phase

Abstract Global positioning system (GPS) radio occultation (RO) data available during 2001–10 have been used to examine the variations in the refractivity during the onset of Indian summer monsoon (ISM) over the east Arabian Sea (5°–15°N, 65°–75°E). An enhancement of 5–10 N-units in the refractivity is observed around 4.8 km (~600 hPa) a few days (9.23 ± 3.6 days) before onset of the monsoon over Kerala, India. This is attributed to moisture buildup over the Arabian Sea during the monsoon onset phase. A sudden increase (1.5–2 K) in mean upper-tropospheric temperature at the time of onset and during the active phase of the monsoon is attributed to convective activity and the release of latent heat. On the day of monsoon onset over Kerala, an appreciable dip in the refractivity is observed that persisted for 1–3 days followed by an enhancement in refractivity with the active phase of the monsoon. An arbitrary value of 128 N-units difference between 4.8 km (~600 hPa) and 16 km (~100 hPa) coupled with a dip in refractivity on the day of monsoon arrival might give an indication of clear transition of atmospheric conditions and the detection of monsoon onset. Further, a good relation is also found between the activity of monsoon and variability in the refractivity.

Increasing incidence of Arabian Sea cyclones during the monsoon onset phase: Its impact on the robustness and advancement of Indian summer monsoon

2021 ◽  
pp. 105915
Author(s):  
P.P. Baburaj ◽  
S. Abhilash ◽  
C.S. Abhiram Nirmal ◽  
A.V. Sreenath ◽  
K. Mohankumar ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Arabian Sea ◽  
Monsoon Onset ◽  
Onset Phase

scholarly journals Interannual variability of the Arabian Sea warm pool intensity and its association with monsoon onset over Kerala

MAUSAM ◽  
2021 ◽  
Vol 58 (3) ◽  
pp. 345-350
Author(s):  
O. P. SINGH
Keyword(s):  
Arabian Sea ◽  
Southern Oscillation Index ◽  
Southern Oscillation ◽  
Warm Pool ◽  
Monsoon Onset ◽  
Sea Surface ◽  
Onset Date ◽  
Peak Intensity ◽  
Sst Anomalies ◽  
Lakshadweep Sea

In this paper the relationships between the Arabian Sea warm pool intensity, Southern Oscillation (SO) and the monsoon onset have been discussed. The results show that the peak intensity of the warm pool in the Lakshadweep Sea is significantly correlated with the monsoon onset date over Kerala. Warmer Sea Surface Temperature (SST) anomalies in the warm pool region during April-May are associated with delayed monsoon onset over Kerala though the cause-and-effect relationship is not known. The Southern Oscillation Index (SOI) of March can provide predictive indications of the peak intensity of the warm pool which, normally occurs during April.

Back‐to‐Back Occurrence of Tropical Cyclones in the Arabian Sea During October–November 2015: Causes and Responses

2020 ◽  
Vol 125 (6) ◽  
Author(s):  
Riyanka Roy Chowdhury ◽  
S. Prasanna Kumar ◽  
Jayu Narvekar ◽  
Arun Chakraborty
Keyword(s):  
Tropical Cyclones ◽  
Arabian Sea

Mechanisms for the Advanced Asian Summer Monsoon Onset since the Mid-to-Late 1990s*

2013 ◽  
Vol 26 (6) ◽  
pp. 1993-2009 ◽  
Author(s):  
Baoqiang Xiang ◽  
Bin Wang
Keyword(s):  
South China Sea ◽  
Arabian Sea ◽  
Asian Summer Monsoon ◽  
Monsoon Onset ◽  
State Change ◽  
Summer Monsoon Onset ◽  
Decadal Shift ◽  
Westerly Winds ◽  
Asian Summer ◽  
Mean State

Abstract Understanding the variability and change of monsoon onset is of utmost importance for agriculture planning and water management. In the last three decades, the Asian summer monsoon onset (ASMO) has remarkably advanced, but the physical mechanisms underlying the change remain elusive. Since the overall ASMO occurs in May, this paper focuses on the change of mean fields in May and considers enhanced mean precipitation and monsoon westerly winds as signs of advanced ASMO. The results reveal that the advanced ASMO mainly represents a robust decadal shift in the mid-to-late 1990s, which is attributed to the mean state change in the Pacific basin characterized by a grand La Niña–like pattern. The La Niña–like mean state change controls the ASMO through the westward propagation of Rossby waves and its interaction with the asymmetric background mean states in the Indian Ocean and western Pacific, which intensifies the Northern Hemispheric perturbations and westerly winds. Intriguingly, the abrupt decadal shifts of monsoon onset in the Arabian Sea and Bay of Bengal occur in 1999, in contrast to the South China Sea with a decadal shift in 1994. Numerical experiments with a coupled climate model demonstrate that the advanced monsoon onset in the Arabian Sea and Bay of Bengal is governed by the enhanced zonal sea surface temperature (SST) gradients in the equatorial Pacific, while that in the South China Sea is primarily determined by the abrupt SST warming near the Philippine Sea.

A Model Study on Understanding the Influence of Arabian Sea Mini Warm Pool on Monsoon Onset Vortex Formation

2011 ◽  
Vol 169 (9) ◽  
pp. 1693-1706 ◽  
Author(s):  
R. Deepa ◽  
C. Gnanaseelan ◽  
M. Deshpande ◽  
P. S. Salvekar
Keyword(s):  
Arabian Sea ◽  
Vortex Formation ◽  
Warm Pool ◽  
Monsoon Onset ◽  
Model Study ◽  
Monsoon Onset Vortex

scholarly journals NUMERICAL SIMULATION OF TROPICAL CYCLONES AND STORM SURGES IN THE ARABIAN SEA

2018 ◽  
pp. 11
Author(s):  
Mohsen Soltanpour ◽  
Zahra Ranji ◽  
Tomoyo Shibayama ◽  
Sarmad Ghader ◽  
Shinsaku Nishizaki
Keyword(s):  
Tropical Cyclones ◽  
Persian Gulf ◽  
Arabian Sea ◽  
Storm Surges ◽  
Ocean Model ◽  
Gulf Of Oman ◽  
The Persian Gulf ◽  
The Impact ◽  
Landfall Location ◽  
Good Agreement

Winds, waves and storm surges of Gonu and Ashobaa, as two recent cyclones in the Arabian Sea and Gulf of Oman, are simulated by a system of WRF-FVCOM-SWAN. The employed models are separately calibrated using the available data. Surges are found to be highly dependent on coastal geometry and landfall location, rather than the storm intensity. Comparisons at different stations reveal that the results of models are in a good agreement with measured parameters. Negative surges are also observed in the enclosed basins of the Persian Gulf and Red Sea. The calibrated atmosphere-wave-ocean model can be utilized for the prediction of extreme events, expected to increase in future due to the impact of the climate change.

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