Abstract
We investigate the control mechanisms of the deep Pacific Ocean circulation by introducing updated methods for parameterizing tidal mixing. The column-integrated rates of dissipation in near- and far-fields are derived from the tidal energy conversion and dissipation rates estimated by a high resolution tide model. In the calculation of the far-field mixing, its dependency on stratification is taken into account based on theoretical and observational knowledge. Unlike previous studies that did not take the stratification dependence into account, the far-field mixing does not function to significantly enhance the deep Pacific Ocean circulation. The deep Pacific Ocean circulation is also found to be insensitive to the decay scale height of the near-field mixing. However, these factors affect the reproducibility of the radiocarbon distribution, especially its minimum in the upper deep layer, through their influence on the mixing with the shallower layers.
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Acknowledgements
This work is supported by the JSPS MEXT KAKENHI Grant Number JPH05825. This research was conducted using the Fujitsu PRIMERGY CX600M1/CX1640M1 (Oakforest-PACS) in the Information Technology Center, The University of Tokyo. All figures are drawn using the libraries of the Python (e.g., NumPy, Matplotlib).
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Kawasaki, T., Hasumi, H. & Tanaka, Y. Role of tide-induced vertical mixing in the deep Pacific Ocean circulation. J Oceanogr 77, 173–184 (2021). https://doi.org/10.1007/s10872-020-00584-0
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DOI: https://doi.org/10.1007/s10872-020-00584-0