Numerical study of the meridional overturning circulation with "mixing hotspots"' in the Pacific Ocean

Takahiro Endoh, Toshiyuki Hibiya

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Using an idealized ocean general circulation model, we examine the effect of "mixing hotspots" (localized regions of intense diapycnal mixing) predicted based on internal wave-wave interaction theory (Hibiya et al., 2006) on the meridional overturning circulation of the Pacific Ocean. Although the assumed diapycnal diffusivity in the mixing hotspots is a little larger than the predicted value, the upwelling in the mixing hotspots is not sufficient to balance the deep-water production; out of 17 Sv of the downwelled water along the southern boundary, only 9.2 Sv is found to upwell in the mixing hotspots. The imbalance as much as 7.8 Sv is compensated by entrainment into the surface mixed layer in the vicinity of the downwelling region. As a result, the northward transport of the deep water crossing the equator is limited to 5.5 Sv, much less than estimated from previous current meter moorings and hydrographic surveys. One plausible explanation for this is that the magnitude of the meridional overturning circulation of the Pacific Ocean has been overestimated by these observations. We raise doubts about the validity of the previous ocean general circulation models where diapycnal diffusivity is assigned ad hoc to attain the current magnitude suggested from current meter moorings and hydrographic surveys.

本文言語英語
ページ(範囲)259-266
ページ数8
ジャーナルJournal of Oceanography
62
3
DOI
出版ステータス出版済み - 6 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • 海洋学

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