期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 126, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JC016739
关键词
anticyclonic eddies; Kuroshio Extension; mixed layer; mode water; storm events
类别
资金
- National Key R&D Program of China [2016YFA0601800]
- Natural Science Foundation of China [41876006]
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography [SOEDZZ1805]
- Fundamental Research Funds for the Central Universities [2020042010]
- National Basic Research Program of China [2012CB955600]
Storms can cause a sharp deepening of the mixed layer inside anticyclonic eddies (AEs) located south of the Kuroshio Extension, with important implications for understanding mixed layer changes and mode water formation within AEs.
Subtropical mode water (STMW) plays an important role in the North Pacific climate system by recording climate variability and by taking in anthropogenic carbon dioxide. A thick STMW forms in anticyclonic eddies (AEs) with deeper mixed layers during winter and early spring. However, the mixed layer depth (MLD) variability and mode water formation in AEs under synoptic weather events are not well known. In this study, we tracked an AE located south of the Kuroshio Extension for several months by 17 Argo floats with daily sampling. We found that the MLD inside the target AE deepened sharply to more than 150 m during storms in April, while the MLD outside had little change and was only 50 m on average. We further compared the different mixed layer deepening processes inside and outside other AEs over the same region based on historical Argo data from 2004 to 2019. Since the relatively weak stratification in AEs is easily destroyed by storms with strong wind bursts and significant surface cooling in early spring, the mixed layer deepening time period lasts longer (December-April) inside AEs than outside AEs (January-March). The mode water ventilation and formation period are correspondingly extended in AEs, with important implications for North Pacific climate variability and the biogeochemical cycle.
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