江家旺, 凌征, 谢玲玲, xxxx. 不同PDO位相期间IOD对热带东印度洋障碍层厚度的影响[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230922001.
引用本文: 江家旺, 凌征, 谢玲玲, xxxx. 不同PDO位相期间IOD对热带东印度洋障碍层厚度的影响[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230922001.
JIANG J W, LING Z, XIE L L, xxxx. Effects of the IOD on barrier layer thickness in tropical eastern Indian Ocean during different PDO phases[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230922001
Citation: JIANG J W, LING Z, XIE L L, xxxx. Effects of the IOD on barrier layer thickness in tropical eastern Indian Ocean during different PDO phases[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230922001

不同PDO位相期间IOD对热带东印度洋障碍层厚度的影响

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

  • 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。

     

    Abstract: 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 tropical eastern Indian Ocean (EIO) during different phases of the Pacific Decadal Oscillation (PDO). The results show that during the warm phase of PDO, the BLT decreases significantly in equatorial EIO 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 equatorial EIO. Consequently, the pIOD-induced negative BLT anomaly in the warm phase PDO is slightly larger than that in the cold 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 equatorial EIO in nIOD events during the cold phase of PDO.

     

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