An improved simulation of the deep Pacific Ocean using optimally estimated vertical diffusivity based on the Green's function method
| Autor: | Nozomi Sugiura, Yoichi Ishikawa, Toshiyuki Awaji, Masao Fukasawa, Hiromichi Igarashi, Takaki Hatayama, Katsuro Katsumata, Shinya Kouketsu, Yuji Sasaki, Shuhei Masuda, Yoshimi Kawai, Takahiro Toyoda, Hiroshi Uchida, Takeshi Kawano, Toshimasa Doi |
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| Rok vydání: | 2015 |
| Předmět: |
Longitudinal static stability
Soil science Ocean general circulation model Internal wave Thermal diffusivity Deep sea Physics::Geophysics symbols.namesake Ocean surface topography Geophysics Data assimilation Green's function Climatology symbols General Earth and Planetary Sciences Physics::Atmospheric and Oceanic Physics Geology |
| Zdroj: | Geophysical Research Letters. 42:9916-9924 |
| ISSN: | 0094-8276 |
| DOI: | 10.1002/2015gl065940 |
| Popis: | An improved vertical diffusivity scheme is introduced into an ocean general circulation model to better reproduce the observed features of water property distribution inherent in the deep Pacific Ocean structure. The scheme incorporates (a) a horizontally-uniform background profile, (b) a parameterization depending on the local static stability and (c) a parameterization depending on the bottom topography. Weighting factors for these parameterizations are optimally estimated based on the Green's function method. The optimized values indicate an important role of both the intense vertical diffusivity near rough topography and the background vertical diffusivity. This is consistent with recent reports that indicate the presence of significant vertical mixing associated with finite-amplitude internal wave breaking along the bottom slope and its remote effect. The robust simulation with less artificial trend of water properties in the deep Pacific Ocean illustrates that our approach offers a better modeling analysis for the deep ocean variability. |
| Databáze: | OpenAIRE |
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