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winter monsoon
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Two world maps compare the Indian monsoon's climatic heat sources and sinks. The top map, labeled Summer Monsoon, highlights the monsoon trough over South Asia as a major heat source and the Mascarene High over the southwest Indian Ocean as a heat sink, with arrows indicating surface air flow from the ocean toward the continent. The bottom map, labeled Winter Monsoon, shows the Siberian High over northern Asia as a heat sink and the Maritime Continent region as a heat source, with air flow arrow
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winter monsoon

meteorology
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Two world maps compare the Indian monsoon's climatic heat sources and sinks. The top map, labeled Summer Monsoon, highlights the monsoon trough over South Asia as a major heat source and the Mascarene High over the southwest Indian Ocean as a heat sink, with arrows indicating surface air flow from the ocean toward the continent. The bottom map, labeled Winter Monsoon, shows the Siberian High over northern Asia as a heat sink and the Maritime Continent region as a heat source, with air flow arrow
Map of climatic heat sources and heat sinks for Asian summer and winter monsoons.

The winter monsoon is a wind system that seasonally reverses direction, blowing from land to sea. This occurs because land cools down more than the sea during winter, creating a high-pressure area over land and a low-pressure area over the sea. Consequently, winds flow from the high-pressure landmass to the low-pressure ocean. In South Asia, for example, these winter winds blow from the northeast and are generally dry, leading to drought conditions in many areas. While rainfall is minimal, some coastal regions may experience precipitation on their windward sides.12

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2 Britannica Sources
  1. monsoon
  2. Asia - The polar front

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