文献类型：期刊文献

中文题名：不同PDO位相期间IOD对热带东印度洋障碍层厚度的影响

英文题名：Effects of the IOD on Barrier Layer Thickness in Tropical Eastern Indian Ocean During Different PDO Phases

作者：江家旺[1,2];凌征[1,2];谢玲玲[1,2,3]

机构：[1]广东海洋大学海洋与气象学院近海海洋变化与灾害预警实验室,广东湛江524088;[2]陆架及深远海气候、资源与环境广东省高等学校重点实验室,广东湛江524088;[3]自然资源部空间海洋遥感与应用重点实验室,北京100081

年份：2025

卷号：43

期号：1

起止页码：32

中文期刊名：海洋科学进展

外文期刊名：Advances in Marine Science

收录：北大核心2023、、北大核心

基金：国家重点研发计划项目(2022YFC3104805);国家自然科学基金项目(42276019)。

语种：中文

中文关键词：热带东印度洋;障碍层;印度洋偶极子;太平洋年代际振荡;盐度

外文关键词：tropical eastern Indian Ocean;barrier layer;Indian Ocean Dipole(IOD);Pacific Decadal Oscillation(PDO);salinity

中文摘要：本文基于1961年至2012年三维温盐数据,探讨了太平洋年代际涛动(Pacific Decadal Oscillation,PDO)不同位相期间,印度洋偶极子(Indian Ocean Dipole,IOD)对热带东印度洋障碍层厚度的影响。结果显示,PDO暖位相期间,赤道东印度洋障碍层厚度在正IOD(pIOD)年显著变薄,而在负IOD(nIOD)年加厚并不明显;PDO冷位相期间,赤道东印度洋障碍层厚度在pIOD年变薄,在nIOD年则明显加厚。分析发现,pIOD引起的东风异常在不同PDO位相下差异较小,其引起的等温层深度差异也较小,但PDO冷位相期间,赤道东印度洋降水正异常更为显著,使得表层盐度降低,混合层变浅,削弱了障碍层厚度负异常,导致PDO暖位相期间pIOD引起的赤道东印度洋障碍层厚度负异常幅度比PDO冷位相期间稍大。nIOD引起的西风异常在PDO冷位相期间比暖位相更为强烈,其激发更强的下沉Kelvin波,导致等温层加深幅度更大,致使PDO冷位相期间nIOD引起的赤道东印度洋障碍层厚度正异常更为显著。

外文摘要：Based on three-dimensional temperature and salinity data from 1961 to 2012,this study investigates the effects of the Indian Ocean Dipole(IOD)on the barrier layer thickness(BLT)in eastern tropical Indian Ocean during different phases of the Pacific Decadal Oscillation(PDO).The results show that during the warm PDO phase,the BLT decreases significantly in eastern equatorial Indian Ocean in positive IOD(pIOD)events,while the thickness changes little in negative IOD(nIOD)events.It is worth to note that the BLT decreases in pIOD events but increases in nIOD events during the cold phase of PDO.It reveals that the pIOD-induced easterly wind anomaly and thinning of isothermal layer are similar during different phases of PDO.However,the pIOD-induced positive precipitation anomalies in the cold phase of PDO are more significant than those in the warn phase,resulting in a decrease in surface salinity,shallower mixed layer,and negative BLT anomaly in eastern equatorial Indian Ocean.Consequently,the pIOD-induced negative BLT anomalies in the warm PDO phase are slightly larger than that in the cold PDO phase.Meanwhile,the nIOD-induced westerly wind anomalies in the cold phase of PDO are stronger than those in the warm phase,leading to stronger downwelling Kelvin waves and deeper isothermal layer and causing a more significant positive BLT anomaly in eastern equatorial Indian Ocean in nIOD events during the cold phase of PDO.