Characteristics of the two OMIP experiments and recent AMOC increase
Prof. Yu-heng Tseng (曾于恒 教授)
台湾大学
邀请人：林鹏飞 研究员
2023年1月4日（星期三）15:30
腾讯会议：737-826-167
报告摘要:
Two ocean–sea ice model experiments are compared using the Taiwan Multi-scale Community Ocean Model (TIMCOM): (a) OMIP1, forced by the Coordinated Ocean-Ice Reference Experiments Phase II data (1948–2009), and (b) OMIP2, forced by JRA55-do data (1958–2018). The observed annual means and the interannual variability of physical states are reasonably captured in both experiments, but improved mean temperatures and salinities are found in OMIP2. The weaker winds and stronger freshwater discharge in the OMIP2 forcing contribute to some simulated differences between OMIP1 and OMIP2. Many patterns and biases are similar to those found in other modeling efforts, confirming the common systematic biases. However, a few unique features are found in this study, including the recent increase of the Atlantic Meridional Overturning Circulation (AMOC) that has been observed in the last decade and a generally higher Drake Passage transport. The enhanced AMOC can be explained by the recent cooling event over the North Atlantic, which thermally increased the surface density flux. The higher Drake Passage transport compared to observations is possibly linked to a stronger bottom cell of meridional circulation and a smaller Antarctic sea-ice extent.
报告人简介:
Dr. Y.-H. Tseng is currently a Distinguished Professor in the Institute of Oceanography, National Taiwan University (NTU). He is also the director of Ocean Center at NTU. Before working at NTU, he has worked as a project scientist at National Center for Atmospheric Research. He developed a new community ocean model system which can simulate the multi-scale ocean dynamics (http://coda.oc.ntu.edu.tw/coda/research/timcom). He also developed different parameterizations and high-performance computational methods to improve the climate model. Recently, he proposed a new Pacific variability framework based on a series of works progressed in the last few years. These works evolve into a latest ENSO prediction scheme which has been used in the current ensemble ENSO forecast made by IRI/CPC and CMME. He has published more than 90 papers in SCI journals. He was a recipient of Outstanding Research Award, National Science & Technology Council and Most Cited Article Award for Terrestrial, Atmospheric and Oceanic Sciences.
