How do winter monsoons change water circulation in the East China Sea?

In the East China Sea, winter monsoons significantly modify water circulation by altering the strength and influence of major currents. During the winter, the prevailing northerly winds bring cold, dry air from the Asian continent, which weakens the north-flowing Kuroshio (Japan Current).

While the Kuroshio remains an important feature of the sea’s hydrology, its overall strength is reduced compared to the summer months. Concurrently, the winter monsoon winds strengthen the southward-flowing coastal currents. This shift in the balance of currents introduces colder water into the region, with temperatures dropping significantly compared to the warmer conditions driven by the summer monsoon. This seasonal reversal highlights the dynamic influence of the monsoon wind system on the sea's physical environment and temperature distribution.1