Typhoons in the northwest Pacific affect sea surface temperature and chlorophyll levels. Before a typhoon hits, the sea surface temperature drops, while chlorophyll levels rise after the typhoon passes. The intensity of these changes is linked to the typhoon's wind speed and movement speed. The depth of the ocean's upper layer before the typhoon influences the temperature change, while the depth of mixing caused by the typhoon affects chlorophyll levels. This study helps us understand how typhoons impact the ocean environment.