Local Sea-Level Rise Caused by Climate Change in the Northwest Pacific Marginal Seas Using Dynamical Downscaling

Frontiers in Marine Science

Do-Seong Byun¹  Eunil Lee¹  Kwang Young Jeong¹  Yang-Ki Cho²  Bong-Gwan Kim²  Yong-Yub Kim² 

[1] Ocean Research Division, Korea Hydrographic and Oceanographic Agency, Busan, Republic of Korea;School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of Korea;

关键词: sea level rise;    climate change;    Northwest Pacific marginal seas;    numerical model;    dynamical downscaling;    tidal amplitude change;   

DOI  :  10.3389/fmars.2021.620570

来源: DOAJ

【 摘 要 】

Global climate models (GCMs) have limited capacity in simulating spatially non-uniform sea-level rise owing to their coarse resolutions and absence of tides in the marginal seas. Here, regional ocean climate models (RCMs) that consider tides were used to address these limitations in the Northwest Pacific marginal seas through dynamical downscaling. Four GCMs that drive the RCMs were selected based on a performance evaluation along the RCM boundaries, and the latter were validated by comparing historical results with observations. High-resolution (1/20°) RCMs were used to project non-uniform changes in the sea-level under intermediate (RCP 4.5) and high-end emissions (RCP 8.5) scenarios from 2006 to 2100. The predicted local sea-level rise was higher in the East/Japan Sea (EJS), where the currents and eddy motions were active. The tidal amplitude changes in response to sea-level rise were significant in the shallow areas of the Yellow Sea (YS). Dynamically downscaled simulations enabled the determination of practical sea-level rise (PSLR), including changes in tidal amplitude and natural variability. Under RCP 8.5 scenario, the maximum PSLR was ∼85 cm in the YS and East China Sea (ECS), and ∼78 cm in the EJS. The contribution of natural sea-level variability changes in the EJS was greater than that in the YS and ECS, whereas changes in the tidal contribution were higher in the YS and ECS. Accordingly, high-resolution RCMs provided spatially different PSLR estimates, indicating the importance of improving model resolution for local sea-level projections in marginal seas.

【 授权许可】

Unknown