If the Himalayas suddenly turn into plains, what impact will it have on the climate of China and India?

If the Himalayas suddenly become a plain, the climate in the northwest of China and the Qinghai-Tibet Plateau will gradually become warm and humid, and the landforms will gradually turn south, while the Indian climate characteristics of high temperature will decrease year by year, resulting in mild and rainy summer and colder and snowy winter. In a word, the elevation change of the Himalayas has both advantages and disadvantages for China and India, but in any case, the elevation of the Himalayas will not change much in a short time.

The tall Himalayas blocked the warm and humid air flow from the Indian Ocean, which made the climate in the northwest of China and the Qinghai-Tibet Plateau dry and cold, and the climate in China showed a variety of trends. Without the Himalayas, the warm and humid air flow in the Indian Ocean will drive straight in, affecting the atmospheric circulation in the Qinghai-Tibet Plateau and northwest China, making the local climate warm and humid. Not only can there be many rivers and lakes, but also can increase biodiversity and improve the climate and environment, and there are many animals and plants unique to warm and humid areas.

Without the Himalayas, China will become a warm place without bad weather, and many geographical boundaries will be redrawn, such as various precipitation lines. Among them, the area of humid areas will expand, the originally arid Gobi and land will be rejuvenated, forming scattered oases and water sources, the desert will become a rare landscape, land and other related resources will be re-divided, and many policies and decisions will be changed accordingly, according to local conditions.

Without the Himalayas, the cold air flow and cold wave from the Arctic Ocean will flock to India, making the already cold winter worse, while the warm and humid air flow from the Indian Ocean will not climb in northern India to form topographic rainfall, which will make India lose some precipitation. However, the only benefit of Himalayan subsidence to India is that it will alleviate the high temperature in India, and the local tropical climate will be mild.