Journal
JOURNAL OF OCEANOGRAPHY
Volume 68, Issue 1, Pages 63-77Publisher
SPRINGER
DOI: 10.1007/s10872-011-0049-9
Keywords
Mixed layer; Mode water; Meso-scale eddy; Sea-surface flux
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Funding
- Japan Society for Promotion of Science (KAKENHI) [20740279, 21340133]
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [22106007]
- Grants-in-Aid for Scientific Research [20740279, 22106007, 22510023, 21340133] Funding Source: KAKEN
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Distributions of mixed layer depths around the centers of anti-cyclonic and cyclonic eddies in the North Pacific Ocean were composited by using satellite-derived sea surface height anomaly data and Argo profiling float data. The composite distributions showed that in late winter, deeper mixed layers were more (less) frequently observed inside the cores of the anti-cyclonic (cyclonic) eddies than outside. This relationship was the clearest in the region of 140A degrees E-160A degrees W and 35A degrees N-40A degrees N, where the temperature and salinity of the deep mixed layers were similar to those of the lighter variety of central mode water (L-CMW). A simple one-dimensional bulk mixed layer model showed that both strong sea-surface heat and momentum fluxes and weak preexisting stratification contributed to formation of the deep mixed layer. These conditions were associated with the anti-cyclonic eddies, suggesting that these eddies are important in the formation of mode waters, particularly L-CMW.
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