TY - JOUR
T1 - An Increase of the Indonesian Throughflow by Internal Tidal Mixing in a High-Resolution Quasi-Global Ocean Simulation
AU - Sasaki, H.
AU - Kida, S.
AU - Furue, R.
AU - Nonaka, M.
AU - Masumoto, Y.
N1 - Funding Information:
OFES2 and OFES2_NT were conducted by using the Earth Simulator under support of JAMSTEC. The topography data set of ETOPO1 was downloaded from DOC/NOAA/NESDIS/NCEI. The M1 and K2 tidal current speeds of FES2012 were downloaded from AVISO+. We thank Hiroyuki Tsujino for providing us with the earlier version of JRA55-do data set before its official release, whose latest version is available at https://esgf-node.llnl.gov/search/input4mips/. We appreciate Yuki Tanaka and Taira Nagai providing guidance to include the tidal mixing scheme into OFES2. H. S. is partially supported by JSPS KAKENHI grant 17?K05662. S. K. and Y. M. are also supported in part by JSPS KAKENHI grants 26257208 and 18H03731.
Funding Information:
OFES2 and OFES2_NT were conducted by using the Earth Simulator under support of JAMSTEC. The topography data set of ETOPO1 was downloaded from DOC/NOAA/NESDIS/NCEI. The M1 and K2 tidal current speeds of FES2012 were downloaded from AVISO+. We thank Hiroyuki Tsujino for providing us with the earlier version of JRA55-do data set before its official release, whose latest version is available at https://esgf-node.llnl.gov/search/input4mips/. We appreciate Yuki Tanaka and Taira Nagai providing guidance to include the tidal mixing scheme into OFES2. H. S. is partially supported by JSPS KAKENHI grant 17 K05662. S. K. and Y. M. are also supported in part by JSPS KAKENHI grants 26257208 and 18H03731.
PY - 2018/8/28
Y1 - 2018/8/28
N2 - The impact of internal tidal mixing on the volume transport of the Indonesian Throughflow (ITF) is examined by a comparison of high-resolution quasi-global ocean simulations with and without a tidal mixing scheme. The ITF transport is found to be increased in the presence of tidal mixing. This is because tidal mixing decreases the density within and below the lower thermocline and increases the buoyancy of the water column. As a result, the surface pressure and the sea surface height (SSH) are raised. The magnitude of the SSH increase is larger for the tropical Pacific Ocean than for the other basins, possibly because many islands exist in the tropical Pacific and tidal mixing is effective around their shallow and rough topographies. Since SSH increases more in the tropical Pacific than in the Indian Ocean, the pressure difference between the two basins is enhanced and thus the ITF transport is strengthened.
AB - The impact of internal tidal mixing on the volume transport of the Indonesian Throughflow (ITF) is examined by a comparison of high-resolution quasi-global ocean simulations with and without a tidal mixing scheme. The ITF transport is found to be increased in the presence of tidal mixing. This is because tidal mixing decreases the density within and below the lower thermocline and increases the buoyancy of the water column. As a result, the surface pressure and the sea surface height (SSH) are raised. The magnitude of the SSH increase is larger for the tropical Pacific Ocean than for the other basins, possibly because many islands exist in the tropical Pacific and tidal mixing is effective around their shallow and rough topographies. Since SSH increases more in the tropical Pacific than in the Indian Ocean, the pressure difference between the two basins is enhanced and thus the ITF transport is strengthened.
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U2 - 10.1029/2018GL078040
DO - 10.1029/2018GL078040
M3 - Article
AN - SCOPUS:85053175689
VL - 45
SP - 8416
EP - 8424
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 16
ER -