文献类型：期刊文献

英文题名：Effect of Subsurface High Spiciness Variability on the Weakened Upper Ocean Stratification in the Western Tropical Pacific Since 2000

作者：Shi, Huangyuan[1,2,3,4,5];Zheng, Shaojun[1,2,3];Du, Ling[4,5];Ni, Xubin[4,5]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Peoples R China;[2]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental S, Zhanjiang, Peoples R China;[3]Guangdong Ocean Univ, Deep Sea Dept Educ Guangdong Prov, Zhanjiang, Peoples R China;[4]Ocean Univ China, Frontier Sci Ctr Deep Ocean Multispheres & Earth S, Phys Oceanog Lab, Qingdao, Peoples R China;[5]Ocean Univ China, Coll Ocean & Atmospher Sci, Qingdao, Peoples R China

年份：2025

卷号：130

期号：7

外文期刊名：JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS

收录：SCI-EXPANDED(收录号：WOS:001525704200001)、、Scopus(收录号：2-s2.0-105010619899)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Grant 42230405, 41825012, and 41576020). We are thankful for the support provided by the Innovative Team Plan for Department of Education of Guangdong Province (2023KCXTD015) and the First-class Discipline Plan of Guangdong Province (010202032401). This research was supported by the program for scientific research start-up funds of Guangdong Ocean University (Grant 101301-060302032303).

语种：英文

外文关键词：ocean stratification; thermal contribution; haline contribution; subsurface spiciness variability; large-scale wind forcing; western tropical Pacific

外文摘要：Recent studies have reported that global upper ocean stratification has intensified under the influence of global warming. Nevertheless, using both observations and long-term reanalysis data, we find that concurrent with the significant ocean warming, the increasing trend of upper ocean stratification attenuated in the western tropical Pacific after 2000. This study highlights the effects of subsurface high spiciness (warm and salty) anomalies on the attenuation of the increasing stratification trend, which mirrors distinct vertical structures in the long-term changes in temperature and salinity. Subsurface warming, rather than sea surface warming, is the primary driver of the increase in the ocean heat content and the weakening of ocean stratification as it substantially reduces the magnitude of the trend in the vertical thermal density gradient after 2000. These phenomena are closely associated with processes on isopycnals and reflect ocean dynamics driven by large-scale atmospheric circulation. Intensified tropical trade winds and accelerated undercurrents facilitate the convergence of heat and salt in the western tropical Pacific. In addition, changes in the depth of the isopycnal layers induced by anomalous wind stress curl contribute to the subsurface spiciness variability through heaving. Notably, the consistent increase in the salinity from the surface to the subsurface also contributes to the post-2000 weakening trend of the vertical haline density gradient. Analysis within the isopycnal framework demonstrates that the emergence of subsurface salty water effectively offsets the negative contribution of the thermal component to the weakening of density stratification in relatively deeper layers.