- 1Chinese Academy of Sciences, South China Sea Institute of Oceanology, State Key Laboratory of Tropical Oceanography, China (luzhiyuan23@mails.ucas.edu.cn)
- 2University of Chinese Academy of Sciences, Beijing, China
- 3Frontier Science Centre for Deep Ocean Multispheres and Earth System and Physical Oceanography Laboratory, Ocean University of China, Qingdao, China
- 4Laoshan Laboratory, Qingdao 266237, China
- 5LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
- 6School of Atmospheric Sciences, Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
- 7Global Ocean and Climate Research Center, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
The western North Pacific anomalous anticyclone (WNPAC) often exists during the mature and decaying phases of El Niño, significantly affecting the East Asian summer monsoon. Previous studies have revealed the importance of the Indian, Pacific, and Atlantic Oceans in generating and maintaining the WNPAC. However, a quantitative comparison of the contributions from these three oceans is still lacking. This study uses pacemaker experiments with a state-of-the-art model to quantify the relative contributions of the three tropical oceans to the interannual WNPAC variability. We find that the Pacific accounts for over 50% of the interannual variance in boreal winter and the following spring, while the roles of the Atlantic and Indian Oceans become more pronounced in spring. In summer, all three oceans contribute significantly and equally. The Indian Ocean SST is influenced by remote forcing from the Pacific Ocean, while the Atlantic Ocean operates more independently, with no evident effect from other oceans.
How to cite: Lu, Z., Dong, L., Song, F., Wu, B., Wu, S., and Wang, C.: Quantifying Relative Contributions of Three Tropical Oceans to the Western North Pacific Anomalous Anticyclone, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-3062, https://doi.org/10.5194/egusphere-egu25-3062, 2025.
