海洋科学2025，Vol.49Issue(7)：1-18,18.DOI:10.11759/hykx20240524002
岛屿对西太平洋纬向急流强度的调控作用
Role of islands in regulating zonal jets strength in the western Pacific Ocean
摘要
Abstract
The western Pacific circulation plays a pivotal role in global material and energy transport within the climate system.Previous studies have indicated that,beneath the conventionally recognized wind-driven circulation,zonal jets alternate between the Northern and Southern Hemispheres.However,substantial discrepancies exist be-tween observations and numerical simulations,observations show a"stronger in the west,weaker in the east"dis-tribution pattern for the North Pacific zonal jets,whereas numerical simulations show the opposite—"stronger in the east,weaker in the west."The reason for this discrepancy remains unclear.Based on this,the core objectives of this study are as follows:to validate the island effect as the key factor driving the aforementioned discrepancy,to examine the physical role of islands,to clarify the regulatory influence of island attributes on the West Pacific zonal jets,and to provide a basis for resolving the contradiction between observations and simulations.To eliminate com-plex confounding factors,this study employed a 1.5-layer simplified gravity model.Under the driving force of zon-al wind stress,a series of sensitivity experiments was designed using the controlled variable method.These exper-iments systematically introduced variations in island location(longitude and latitude),size,and the presence or absence of lateral friction to assess the influence of island geometry and physical parameters on the zonal jets.Ex-perimental results reveal that islands exert a significant regulatory effect on the zonal jets.First,introducing islands generates intense zonal jets west of the island,with easterly jets to the north and westerly jets to the south.Second,this regulatory effect shows strong positional dependence:the jets-enhancing effect peaks near 20 °N as the island's latitude varies,while the peak occurs near 110°E when the island's longitude changes.Island scale also influences the jets structure:as the island surface area increases,the latitudinal extent of the enhanced jets west of the island broadens,while the core intensity of the jets weakens.Finally,model experiments indicate that lateral friction asso-ciated with islands suppresses jets formation.Through idealized numerical experiments,this study clearly identifies islands as a key factor regulating the intensity and spatial structure of the North Pacific zonal jets stream in the northwest Pacific.The location,scale,lateral friction,and other properties of islands influence jets characteristics through distinct mechanisms.This finding not only provides a novel physical explanation for the discrepancies be-tween observations and simulations but also underscores the importance of accurately capturing island effects in ocean and climate models to enhance the simulation capability of the western Pacific circulation.关键词
西太平洋/纬向急流/约化重力模式Key words
Western Pacific Ocean/zonal jets/reduced-gravity model分类
海洋科学引用本文复制引用
侯剑浩,张林林,徐勤博,王震,严啸峦,康霖..岛屿对西太平洋纬向急流强度的调控作用[J].海洋科学,2025,49(7):1-18,18.基金项目
国家自然科学基金项目(42576027) （42576027）
中国科学院战略性先导科技专项(XDB42010105) （XDB42010105）
国家自然科学基金项目(42506002,42122041,42449909) （42506002,42122041,42449909）
泰山学者项目(tsqn202103128)the National Natural Science Foundation of China,No.42576027 （tsqn202103128）
the Strategic Priority Research Program of the Chinese Acade-my of Sciences,No.XDB42010105 （）
the National Natural Science Founda-tion of China,Nos.42506002,42122041,42449909 （）
the TS Scholar Pro-gram,No.tsqn202103128 （）
