Why Mascarene High is formed?

The Mascarene High (MH) is a semi-permanent subtropical high-pressure zone in the South Indian Ocean. Significant positive trends are observed in sea surface temperature (SST), sea surface height (SSH) and oceanic heat content (OHC) during this period in the MH region.

What is Mascarene High How does it impact the weather pattern in the Indian subcontinent explain?

A stronger high pressure will produce stronger winds or monsoon current. If there is a delay in the formation of Mascarene High, there is also the possibility of a delay in the onset of monsoon in India. The position and intensity of this high are considered to be closely linked to the south summer monsoon activity.

How is southwest monsoon?

Southwest monsoon sets in over the extreme southwestern tip of the peninsula by the end of May. The onset of Monsoon is characterized by a sudden spurt of rainfall activity. It progresses inland in stages and covers the entire country by the middle of July.

What is the monsoon pattern in India?

Indian monsoon, the most prominent of the world’s monsoon systems, which primarily affects India and its surrounding water bodies. It blows from the northeast during cooler months and reverses direction to blow from the southwest during the warmest months of the year.

Where is Mascarene High?

The Mascarene High is an anticyclone located over the Southern Indian Ocean and has a vital role in weather and climate variability over Southern Africa. The warm Western Indian Ocean is a major source of moisture for the subcontinent also permitting tropical cyclone genesis.

What are the factors that affect Indian monsoon?

Factors influencing the onset of SW monsoons:

• Intense low-pressure formation over the Tibetan Plateau.
• The permanent high-pressure cell in the South of the Indian Ocean.
• Subtropical jet stream.
• African Easterly jet (Tropical easterly jet)
• Inter-Tropical Convergence Zone (ITCZ)

Why Indian monsoon is called southwest monsoon?

The southwest monsoon derives its name from winds which blow from a south-westerly direction in the Indian subcontinent. Normally, this high-pressure region starts forming by mid-April and its strength is an important factor which determines the intensity of monsoon in India.

Why is it called southwest monsoon?

What are the types of monsoon?

The Types of Monsoons

• Monsoon Cycles. In India, Australia and other equatorial regions, monsoons move from cold, high pressure systems to warmer areas of less resistance with low atmospheric pressure.
• Summer Monsoons.
• Dry Monsoons.
• Embryo Monsoons.

What are the branches of Indian monsoon?

The two branches of monsoon are Arabian Sea branch and Bay of Bengal branch.

What country is part of the Mascarene Islands?

country of Mauritius
All are volcanic in origin. The name Mascarene is taken from the 16th-century Portuguese explorer Pedro de Mascarenhas. The islands now form the country of Mauritius (Rodrigues Island is a dependency of Mauritius) and the French overseas département of Réunion, and all face problems of extreme population pressure.

How does the Mascarene High affect the monsoon?

During positive (negative) SIOD event, the Mascarene High shifting southeastward (northwestward) from austral to boreal summer causes a weakening (strengthening) of the monsoon circulation system by modulating the local Hadley cell during the Indian Summer Monsoon event.

Where is the Mascarene High located in India?

This high-pressure region located between 25°S-35°S and 40°E-90°E near the Mascarene Islands in the southern Indian Ocean is a source of Southwest monsoon in India. Since, it is a high pressure are, it is also known as Mascarene high.

How is the Mascarene High index related to rainfall?

The relationship between Mascarene high indices and rainfall over the study area was revealed. The Mascarene East Ridge index presented significant correlation (r=0.53) with OND rainfall.

Where are the Mascarene Islands in the Indian Ocean?

The Mascarene Islands is a group of islands in the Indian Ocean east of Madagascar from where the cross equatorial winds blow to India. It is also called the Indian Ocean subtropical high, which is a high-pressure area located between 20° to 35° South latitude and 40° to 90° East longitude.