Research and prospect of ventilation in the last deglaciation in the pacific ocean

As a sensitive climate indicator, the variability of CO₂ is tightly related to climate change. The fluctuation of greenhouse gas during the last deglaciation(18.0~11.7 ka)was correlated with the change of oceanic circular pattern. However, it is still unclear how the oceanic circular pattern changed in the Pacific Ocean and how they respond to the variability of CO2 concentration in the last deglaciation, though there is significant change of circular pattern in the north Atlantic and southern ocean. Reasonable illustration about the ventilation history and mechanism will be contributed to understanding the interaction between different climate systems. This paper summarizes the research status of the last deglaciation oceanic ventilation in the Pacific Ocean. It is concluded that B-P age method, Projection age method, B-A age method, U series dating and 14C method can approximately calculate the ventilation age. And also, it is believed that in the cold period of the last deglaciation the North Pacific Ocean was mainly occupied by the vigorous North Pacific intermediate water, whereas the South Pacific Ocean was occupied by the Antarctic intermediate water carrying the characteristics of depleted carbon pool, and they returned to its current climate during the warm period. The existence of deeper north Pacific intermediate water and 14C depleted Antarctic intermediate water was influenced by the climate change, which in turn affect regional climate, such as pH, biological productivity, redox. Competition between the North and South Source Water mass during the deglaciation may dominate the response to the global climate of the pacific. However, the lacking research of the marine surface reservoirs and the deepwater has quite limited the current study of oceanic ventilation in the Pacific Ocean, and the comprehensive evolution of intermediate water is urgently needed.