The correct option is Cyclonic storms are less frequent in the Arabian Sea than in the Bay of Bengal..
Explanation
Tropical cyclones in the North Indian Ocean basin are influenced by Sea Surface Temperatures (SST), Coriolis force, and vertical wind shear. There is a distinct variation in the frequency and intensity of cyclones between the Bay of Bengal and the Arabian Sea due to oceanographic and atmospheric differences.
- The Arabian Sea is generally warmer than the Bay of Bengal. is Incorrect: The Bay of Bengal is generally warmer than the Arabian Sea. The Arabian Sea experiences strong upwelling, particularly off the coasts of Somalia and Oman, which brings cooler subsurface water to the top, limiting the thermal energy required for cyclone genesis.
- Cyclonic storms are less frequent in the Arabian Sea than in the Bay of Bengal. is Correct: Historically, the frequency of tropical cyclones in the Bay of Bengal is roughly four times that of the Arabian Sea. This is attributed to higher SSTs, the semi-enclosed nature of the Bay, and the inflow of remnant depressions from Pacific typhoons that regenerate in the Bay of Bengal.
- The Bay of Bengal has a significantly narrower continental shelf than the Arabian Sea. is Incorrect: While the continental shelf off the eastern coast of India is generally narrower than that of the western coast, this statement describes a geological feature rather than a pattern of tropical cyclones. Additionally, the shallow continental shelf in the northern Bay of Bengal is a key factor in amplifying storm surges, but the statement itself does not describe the cyclone occurrence pattern.
- The Arabian Sea experiences stronger trade winds that prevent cyclone formation. is Incorrect: The primary factor inhibiting cyclone formation in the Arabian Sea is often high vertical wind shear and lower SSTs, rather than the strength of trade winds alone. Strong stratification in the Arabian Sea also inhibits the release of energy required for cyclones.
Key Takeaway: The Bay of Bengal experiences a significantly higher frequency of tropical cyclones than the Arabian Sea primarily due to higher sea surface temperatures and the reception of remnant low-pressure systems from the Pacific Ocean.